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Private Label Agreement and Project Development and License Agreement [Amendment No. 3] - Cisco Systems Inc. and Frontier Software Development Inc.

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                               AMENDMENT NO. 3 TO
                             PRIVATE LABEL AGREEMENT
                                       AND
                    PROJECT DEVELOPMENT AND LICENSE AGREEMENT
                                     BETWEEN
                               CISCO SYSTEMS, INC.
                                       AND
                       FRONTIER SOFTWARE DEVELOPMENT, INC.


         This Amendment No. 3 ("Amendment #3") is made in California by and
between Cisco Systems, Inc., a California corporation having its principal place
of business at 170 West Tasman Drive, San Jose, CA 95134-1706, U.S.A. ("Cisco"),
and Frontier Software Development, Inc., a Delaware corporation having its
principal place of business at 321 Billerica Road, Chelmsford, Massachusetts
01824 ("Frontier").

         WHEREAS, Cisco and Frontier entered into the Project Development and
License Agreement on July 13, 1994 ("Software Agreement"), as amended on January
4, 1995 ("Amendment #1") pursuant to which Frontier licensed certain software
products (as defined in the Software Agreement) to Cisco; and

         WHEREAS, Cisco and Frontier entered into the Private Label Agreement on
October 17, 1995 ("Hardware Agreement") pursuant to which Frontier is selling
certain products (as defined in the Hardware Agreement) to Cisco; and

         WHEREAS, Cisco and Frontier entered into an Amendment to the Hardware
Agreement and the Software Agreement on May 15, 1996 ("Amendment #2"); and

         WHEREAS, Cisco and Frontier desire to change and add certain terms to
the Software Agreement, Hardware Agreement, Amendment #1 and Amendment #2
(collectively, the "Agreement") as specified below.

         NOW THEREFORE, in consideration of the covenants and conditions
contained herein, the parties agree as follows:

1.0      DEVELOPMENT WORK. Cisco shall have the right to request that Frontier
perform independent projects specific to Cisco such as, but not limited to,
customization of an interface, addition of features, or integration of
Frontier's RMON products into Cisco products. Frontier agrees that it will not
unreasonably reject such Cisco requests. Such projects shall be subject to the
terms and negotiations agreed upon by the parties. The statement of work
("Statement of Work") for each project shall include, as required, the following
provisions: project specifications, NRE charges and payment terms, prepaid
royalties or per unit royalties, upgrade charges (if different from the policy
agreed upon in the Agreement), schedules, reschedule terms inclusive of
penalties for schedule delays, project cancellation terms inclusive of penalty
charges, acceptance criteria, project review

<PAGE>

and approval processes, ownership of the work performed, resale/license
obligations and restrictions of the parties for the modified products, and
any further obligations required by Cisco to complete the project."

Cisco agrees to pay Frontier a [*] fee of [*] for development work [*] to by the
parties and completed [*] of this Amendment #3. The projects covered by this fee
include without limitation: Embedded RMON agents for the [*].

As a Statement of Work is mutually agreed upon and signed by an authorized
representative for each party it will be incorporated into the Agreement as an
amendment. A Statement of Work format is attached as Exhibit A.

2.0      AGENT ROYALTIES. Section 3.2 (License Fees) of Amendment #2 is changed
as follows: ---------------

         2.1   Royalties for agents shipped prior to the effective date of this
Amendment #3 will be paid per the terms of Amendment #2.

         2.2   Royalties for RMON Embedded Agent Software (as defined below in
Section 7.(d)) shipped upon the effective date of this Amendment #3 and
thereafter will be as follows:

         (a) Cisco agrees to pay Frontier a [*] royalty of [*] for any and all
copies of the RMON Embedded Agent Software made and distributed by Cisco and
incorporated within [*] or within any other Cisco software environment except
the Cisco products listed in Section 2.2(b) below. Frontier warrants that the
RMON Embedded Agent Software provides, at a minimum, the full functionality to
comply with the RMON1 (RFC 1513 and 1757 specification) plus the RMON2
specification as it is released by the Internet Engineering Task Force.

         (b) Subject to the conditions in Section 2.3 below, Cisco agrees to pay
Frontier a one-time royalty payment of [*] plus a per-unit royalty as specified
in this Section 2.2 below for the following Cisco Catalyst products ("Cisco
Catalyst Products"):

                           Catalyst [*]
                           Catalyst [*]
                           Catalyst [*] Family
                           Catalyst [*] Family [*]

         Per Unit Royalty:

             (i)   Cisco will pay a per-unit royalty of [*] for each Cisco
                   Catalyst Product unit incorporating some or all of the
                   functionality specified as RMON1 (per RFCs 1513 and 1757).

                                       2


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>


             (ii)  Cisco will pay a per-unit royalty of [*] for each Cisco
                   Catalyst Product unit incorporating the functionality
                   specified in this Paragraph (b)(i) above plus the compete
                   functionality of RMON2 as it is released by the Internet
                   Engineering Task Force.

             (iii) For a situation in which a Cisco Catalyst Product
                   incorporates the functionality of some but not all 9 groups
                   of RMON2, Cisco will pay a per-unit royalty of [*] plus [*]
                   for each group, or portion of a group, of RMON2 incorporated
                   into such product.

         2.3   Conditions:

             (i)   One per-unit royalty payment as specified above is due for
                   each Cisco Catalyst Product shipped by Cisco for revenue in
                   which one or more instances of RMON Embedded Agent Software
                   are licensed for use by the licensee for some level of RMON
                   agent functionality whether or not Cisco explicitly charges
                   its customers for the RMON capability.

             (ii)  Cisco's obligation to pay a per-unit royalty for a Cisco
                   Catalyst Product under Section 2.2(b)(i) or the [*] base
                   royalty under Section 2.2(b)(iii) above shall terminate upon
                   the inclusion by Cisco of the RMON1 feature(s) as a [*] in
                   the base price of the respective Cisco Catalyst Product,
                   provided the following conditions have been met: (i) Cisco
                   provides evidence to Frontier that [*] for delivery of the
                   RMON1 feature(s) in the Cisco Catalyst Product as a standard
                   no charge feature(s); and (ii) such evidence indicates that
                   the [*] by Cisco. Frontier agrees to accept reasonable
                   evidence to establish the foregoing conditions.

            (iii)  Cisco's obligation to pay a per-unit royalty for a
                   particular Cisco Catalyst Product ends when such product is
                   shipped with Cisco's [*], or when the Agreement expires or
                   is terminated for cause by Cisco, or when Cisco exercises
                   its right to manufacture Products (in which event the
                   royalty will be as specified in Section 14 below).

            (iv)   The per-unit royalties of this Section 2.3 do not apply to
                   Embedded Probes as defined in Section 3 below.

3.0      EMBEDDED PROBES. For the purposes of the Agreement, "Embedded Probes"
shall mean Products in which the [*] provides RMON1, RMON2 functionality plus
extensions as then agreed to by the parties and executes on hardware which:
(i) is used primarily to execute RMON code, and (ii) such hardware is an
optional module that is inserted into a Cisco chassis.

                                       3


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>



         3.1   An Embedded Probe shall include functionality for RMON1, RMON2,
[*], and shall support roving. In the event that the features agreed to for such
Products in the respective Statements of Work are significantly different from
the guidelines given herein, the parties will renegotiate in good faith the
Embedded Probe royalties of Section 3.2 below.

         3.2   Per-unit royalties for Embedded Probes shall be as follows:



                                                                    Per-unit royalty
                                                                 
         For the first [*] revenue units shipped by Cisco           [*]
         For the next [*] revenue units shipped by Cisco            [*]
         For units shipped by Cisco for revenue beyond [*] units    see below


         For Embedded Probe shipments for revenue beyond [*] units, the parties
agree to negotiate in good faith the royalties based upon then existing
conditions in the marketplace. Cisco agrees to pay a royalty of [*] per unit
shipped for revenue during the negotiation process. When the new royalty is
agreed to, Frontier will credit Cisco for the net difference for all units
shipped beyond [*] units.

         3.3   A Product that meets the conditions for an Embedded Probe as
given in Section 3.0 above and in addition is implemented within [*] shall be
subject to the royalties per Section 3.2 above.

4.0      PROBE INVENTORY BALANCING, Frontier agrees to [*] Cisco a [*] to
balance its inventory of stand-alone under the following conditions:

         4.1   Per the conditions specified in Section 4.2, Cisco can balance
up to [*] probe units as follows:

               (i)   Substitute alternative probe models for the [*] probes on
                     order but not yet delivered by Frontier, and

               (ii)  Return up to [*] units from [*] at a rate of up to [*]
                     units per month beginning on the effective date of this
                     Amendment #3 and continuing for [*] months.

         4.2   Conditions for product rotation:

               (i)   Products will be swapped on a one for one basis such that
                     for each unit substituted or returned to Frontier by Cisco,
                     Frontier will ship one replacement unit of the probe model
                     designated by Cisco.

                                       4


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>



               (ii)  Cisco shall [*] of [*] of the original cost to Cisco for
                     each probe returned or substituted. Cisco will place a
                     purchase order for the [*] on each occasion Cisco exercises
                     its right to return or substitute probes.

               (iii) In the event the total cost (excluding the [*]) of the new
                     products to be shipped to Cisco is higher than the total
                     original cost of the products being returned or substituted
                     by Cisco (i.e., the net difference), Cisco will issue a
                     purchase order for the net difference on each occasion
                     Cisco exercises its right to return probes.

               (iv)  In the event the total cost of the new products (excluding
                     the [*]) to be shipped to Cisco is lower than the total
                     original cost of the products being returned or substituted
                     by Cisco (i.e., the net difference), Cisco will issue a
                     purchase order to purchase additional products of a value
                     equal to or greater than the net difference, for delivery
                     within 45 days. The payment due on such purchase order is
                     the amount by which the new units exceed the [*].

               (v)   Cisco will pay the shipping costs for the returned probes.

               (vi)  Probe units on order as of the effective date of Amendment
                     #3 for products other than [*] probes are separate from
                     this balancing and are not to be [*] the [*] as a result of
                     this balancing.

5.0      PROBE DISCOUNT. The parties agree to extend the current stand-alone
probe discount structure for an additional year through October 31, 1997.
Thereafter, the discount structure will be as mutually agreed by the parties.

6.0      TRAFFICDIRECTOR UPGRADES TO REVISION 4.1. Cisco will pay the following
upgrade fee to upgrade Cisco customers of TrafficDirector 3.3 and any version of
NetScout Manager to TrafficDirector 4.1 (based upon Frontier's NetScout Manager
Plus 4.1 Software):

         Standalone Unix upgrade            [*]
         Standalone PC/WinNT upgrade        [*]
         Bundled Unix upgrade               [*]
         Bundled PC/WinNT upgrade           [*]

This upgrade fee is payable only for licenses actually upgraded to
TrafficDirector 4.1. For subsequent upgrade releases from TrafficDirector 4.1 to
later versions, Cisco shall pay a royalty fee of [*] per unit as specified in
Amendment #2 Section 2.3(c).

                                       5


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>


7.0      DEFINITIONS AND LICENSES.

         7.1   Definitions.

               (a) For purposes of the Agreement, and notwithstanding anything
to the contrary in the Agreement, the term "Software," as respectively defined
in Section 1.1 of the Hardware Agreement and Section 1 of the Software
Agreement, is hereby modified to collectively mean RMON Embedded Agent Software
and Other Software as defined in this Section 7.1 below.

               (b) For purposes of the Agreement, and notwithstanding anything
to the contrary in the Agreement, the term "source code" shall include
sufficient information for a knowledgeable software engineer to produce
completely functional machine readable binary code for all Software, including
but not limited to, design documentation, technical documentation, design and
functional specifications, software libraries, compilers, utilities, listings,
test suites, build scripts and tools to compile, assemble and test code in
Frontier's possession or under its control . In cases where such tools are
commercially available, source code shall only include the supplier, model and
revision information to uniquely and unambiguously identify each such tool.

               (c) The term "Product" shall have the definition specified in
Section 1 of Amendment #2.

               (d) For purposes of the Agreement, and not withstanding anything
to the contrary in the Agreement, the term "RMON Embedded Agent Software" shall
mean software providing, the functionality of an RMON agent embedded within a
Cisco product, which agent conforms to the RMON1 specification per RFC 1513 and
RFC 1757 and the RMON2 specification as it is released by the Internet
Engineering Task Force.

               (e) For purposes of the Agreement, and not withstanding anything
to the contrary in the Agreement, the term "Other Software" shall mean all
software, except RMON Embedded Agent Software, provided to Cisco by Frontier as
a Product under this Agreement, regardless of whether embedded or bundled with a
hardware product, or provided as a standalone software product. Other Software
includes, but is not limited to, stand-alone probe Products, Embedded Probes and
TrafficDirector.

               (f) For purposes of the Agreement, and not withstanding anything
to the contrary in the Agreement, the term "Derivative Works" shall mean
modifications to RMON Embedded Agent Software made by or for Cisco.

               (g) It is understood that RMON Extensions are limited to the
functionalities specified in RMON2.

                                       6


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>



The parties agree and acknowledge that nothing in this Amendment # 3 shall be
construed to diminish, restrict or limit any rights or privileges which Cisco is
already entitled to under the Agreement. Any ambiguity arising from the new
definitions of terms in this Section 7 will not be interpreted against Cisco to
diminish rights previously granted to Cisco under the Agreement.

         7.2   Licenses.

               a) RMON Embedded Agent Software. The license granted in Section
4, the first paragraph, of the Software Agreement applies in its entirety to
RMON Embedded Agent Software (binary and source code form) and all related
documentation and tools . Frontier shall retain title and full ownership rights
to the RMON Embedded Agent Software as specified in Section 6 of the Software
Agreement for RMON software and RMON Extensions. Cisco shall retain title and
full ownership to the Derivative Works as specified in Section 6 of the Software
Agreement. In addition, Cisco hereby grants to Frontier a worldwide,
irrevocable, perpetual and nonexclusive license to use, modify, copy, market,
distribute or otherwise dispose of the Derivative Works, provided that such
Derivative Works which are feature enhancements to the RMON Embedded Agent
Software may not be licensed or distributed in any manner by Frontier to any
third party without Cisco's prior written consent.

               (b) Other Software. Notwithstanding anything to the contrary in
the Agreement, Frontier hereby grants Cisco a worldwide, non-exclusive license
to use, modify, copy and have copies, market, distribute or otherwise dispose of
Other Software in both machine readable binary and source code form, subject to
the following restrictions:

                   (i)   Cisco's right to modify the Other Software shall be
                         solely for the purpose of providing customer support
                         and providing software bug fixes, patches and
                         maintenance releases.

                   (ii)  Frontier shall retain ownership of any modifications
                         that Cisco makes to the Other Software, and Cisco shall
                         provide to Frontier in a timely manner all such
                         modifications Cisco makes to the Other Software.

                   (iii) Cisco shall have no right to sublicense or cross
                         license the Other Software as a standalone product.

         7.3   Source Code Restrictions. Cisco shall not have the right to
distribute or sublicense any source code owned by Frontier unless such source
code is distributed or sublicensed with or as part of Cisco source code or Cisco
hardware. In no event shall a sublicensee of the Frontier source code have the
right to sublicense such source code to other parties or to make modifications
of such source code that [*]. Cisco shall protect Software source code provided
hereunder and/or sublicensed to others to the same extent that it protects its
own source code.

                                       7


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>



         7.4   Sublicense Rights. The Agreement is modified by adding the
following:

         "Frontier hereby grants Cisco the right to sublicense its license
rights granted under this Agreement, and authorizes the granting of sublicenses
for, the Software, provided to Cisco by Frontier solely as part of or in
connection with Cisco's software or products. Any per copy royalty payments due
Frontier shall accrue at the time Cisco makes and distributes the copy of the
applicable Software or at the time Cisco's OEM makes and distributes the copy of
the applicable Software. Cisco is obligated to account for and make payment for
any per-unit royalties for sublicenses in the same manner it does so for other
per-unit license royalties covered under the Agreement."

         7.5   Delivery. Frontier agrees to promptly deliver to Cisco the
machine readable binary and source code for the Software (including without
limitation, all new releases, bug fixes, maintenance fixes, updates and the like
for the Software) as required under the Agreement or as such Software becomes
available.

8.0     TERM OF AGREEMENT. The expiration dates of the Hardware Agreement and
the development portion of the Software Agreement are hereby extended to October
31, 2000.

9.0    LICENSE ADMINISTRATION. The parties agree to use commercially reasonable
efforts to implement a license administration system within thirty (30) days
after the effective date of this Amendment #3 that is easy and convenient for
Cisco and Cisco's customers to use and acceptable to both parties.

10.    RIGHTS IN THE EVENT FRONTIER ENTERS NEGOTIATIONS TO BE ACQUIRED. In the
event that Frontier enters serious negotiations with another party for that
party to acquire Frontier, Frontier will notify Cisco it has entered serious
negotiations to be acquired ("Notification"). Within [*] Cisco will inform
Frontier in writing whether it wishes to negotiate to acquire Frontier.

If Cisco indicates it does not wish to negotiate to acquire Frontier, Frontier
is then free to execute an agreement to be acquired by another party without
constraint. If Frontier does not sign a definitive agreement to be acquired
within [*] from the date of Notification, this process restarts (i) on the next
occurrence of Frontier entering into serious negotiations to be acquired, or
(ii) at the end of such [*] if Frontier is then engaged in serious negotiations
to be acquired.

If Cisco indicates its intention to negotiate to acquire Frontier, Frontier will
negotiate in good faith with Cisco ("Cisco Negotiation"), an arrangement
pursuant to which Cisco would acquire Frontier. Frontier reserves the right to
carry on negotiations with other parties during the Cisco Negotiation.

                                       8


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>


Prior to executing an agreement to be acquired by a third party, and at the
point at which Frontier has [*] with third parties, Frontier will notify Cisco
that it [*] Frontier.

After completing this process in good faith, Frontier reserves the right to
evaluate offers for acquisition from all parties and to accept an offer or
reject all offers as it solely deems appropriate.

Notification, and Cisco's indication that is wishes to negotiate to acquire
Frontier, starts a negotiation period between Cisco and Frontier during which
Frontier will refrain from executing [*] agreement to be acquired by any third
party until after it has followed the process given above and Cisco has had a
reasonable time to submit offers including a [*]. The parties will negotiate in
good faith at the time of Notification and during this process to mutually agree
on what constitutes a reasonable time and process for Cisco to negotiate a firm
offer to acquire Frontier.

All notifications between Frontier and Cisco and all offers by Cisco within this
negotiation process shall be in writing. For purposes of notifying Cisco that
Frontier is engaged in serious negotiations, Frontier's Board of Directors shall
determine when Frontier is in serious negotiations, thereby triggering,
Frontier's obligation to provide such notice to Cisco.

The provisions of this section shall expire on the date a registration statement
filed by Frontier under the Securities Act of 1933, as amended, first becomes
effective.

11.0     PREFERRED RMON VENDOR.

         11.1     Definitions:

               (a) For the purposes of the Agreement, "Covered RMON" products
shall mean products providing RMON1 and RMON2 functionality plus extensions in
the form of:

                      (i)   Standalone probes for LAN and WAN environments
                            similar to Frontier's NETscout probes and future
                            enhancements including future LAN and WAN network
                            topologies,

                      (ii)  Network monitoring and analysis applications similar
                            to NETscout Manager Plus and future enhancements of
                            such products by Frontier including the support for
                            future LAN and WAN network topologies, and

                      (iii) Embedded probes for Cisco's products with features
                            similar to or a subset of NETscout probes for
                            present and future LAN and WAN network topologies.

                                       9


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>


               (b) For the purposes of the Agreement, "Other RMON" products
shall mean products other than Covered RMON products which have functionality
conforming to some or all of the groups of the RMON1 or RMON2 standards or
functionality that extends RMON-like capability to new LAN or WAN media or
network environments.

         11.2  Preferred RMON Vendor. Beginning on the effective date of this
Amendment #3, Cisco establishes Frontier as its Preferred RMON Vendor. For the
purposes of the Agreement, and subject to the exceptions defined herein, Cisco's
classification of Frontier as its Preferred RMON Vendor shall mean that Cisco
will incorporate in its price list, promote and offer for sale/license, both
directly and indirectly through its resale channels, Products under this
Agreement as its primary solutions to meet Cisco's RMON product needs. For the
duration of the Agreement and subject to Frontier maintaining its Preferred RMON
Vendor status per Section 11.3 below, Cisco agrees to work in good faith with
Frontier as follows:

               (a) In the event Cisco identifies a need for a Covered RMON
product or Other RMON product, and a then-existing product from Frontier meets
Cisco's product requirements, Cisco will purchase such Product from Frontier
subject to Subsection 11.2(c) below.

               (b) In the event Cisco identifies a need for a Covered RMON
product which is not a then-existing Frontier product, Cisco will notify
Frontier of its needs and will negotiate in good faith for a reasonable period
of time to have Frontier develop (under a Statement of Work) and supply such
Product to Cisco subject to Subsection 11.2(c) below.

               (c) To be the selected vendor for a particular Covered RMON
product or Other RMON product, Frontier must meet Cisco's product functionality
and availability requirements and offer the product at a cost to Cisco
(including product cost and development cost) comparable to costs available to
Cisco from other sources for comparable products, with reasonable development
schedules, and commercially reasonable delivery and terms.

               (d) After a Covered RMON product has been added as a Product
under the Agreement, Cisco shall not distribute an internally-develop product
that is substantially similar to such Product supplied by Frontier.

               (e) Cisco will keep Frontier informed of its ongoing interests
and needs for RMON products and will provide Frontier the opportunity to be
Cisco's OEM supplier of such products.

               (f) In the event that Cisco, having followed the process herein
defined in this Section 11.2, obtains a Covered RMON product from another OEM
supplier,

                                       10


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>



Cisco is not subsequently obligated to use a comparable Frontier product in
place of the other product.

               (g) In the event Cisco decides to distribute a Covered RMON
product that is developed by Cisco pursuant to this Section 11.2 or by a company
acquired by Cisco, Cisco's then designated Project Manager shall notify Frontier
at the time Cisco makes a firm decision to implement such plans.

         11.3  To maintain its status as Preferred RMON Vendor, Frontier must
continuously adhere to all of the following conditions:

               (a) Frontier is not in default of any substantive terms of the
Agreement, including, but not limited to, the terms of Section 17 (Sales
activity) and Section 19 (Cost Reduction) of this Amendment #3.

               (b) Frontier meets the quality standards for Products as set by
Cisco for all of Cisco's products,

               (c) Frontier provides support and maintenance for Products as
reasonably requested by Cisco,

               (d) Frontier develops new Products under Statements of Work in a
timely manner to meet Cisco's requirements.

Cisco will determine in it sole discretion whether Frontier is meeting all of
these conditions in this Section 11.3. In the event that Frontier ceases to meet
all of these conditions and thus is in jeopardy of losing its Preferred RMON
Vendor status, Cisco shall notify Frontier that it does not then meet the
conditions for Preferred RMON Vendor status and Cisco and Frontier management
will meet in good faith to resolve those issues which are causing Frontier not
to meet the conditions for Preferred RMON Vendor status. If issues causing
Frontier to lose its Preferred RMON Vendor status are not resolved within a
reasonable and mutually determined time frame after notification, Frontier will
lose its Preferred RMON Vendor status and Cisco is free to use alternative
vendors or to develop and supply Covered RMON products and Other RMON products
to meet Cisco's needs without violation of this Section 11.

         11.4  The rights conferred to Frontier as Preferred RMON Vendor in this
Section 11 notwithstanding, Cisco reserves rights to:

               (a) Acquire companies providing Covered RMON products and Other
RMON products and to use, sell or license RMON products developed by the
acquired company.

                                       11


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>


               (b) Develop and distribute its own Covered RMON products or Other
RMON products subject to the limitations of Section 11.2 above,

               (c) Exercise its Manufacturing Rights in accordance with the
terms of this Agreement,

               (d) Develop embedded RMON agents, or make modifications to
Software as specified in this Agreement,

               (e) Use, sell, or license Other RMON products from other vendors
subject to the limitations of Section 11.2 above,

               (f) Use, sell or license Covered RMON products from other vendors
that are (i) incidental to other of Cisco's business relationships and which are
non-strategic product solutions that will be replaced by Products under this
Agreement within a reasonable time frame subject to Section 11.2(c) above, (ii)
needed to meet unique customer obligations, subject to notification to Frontier
per Section 11.2(e) above, and (iii) Other RMON products committed for inclusion
in Cisco's products prior to the effective date of Amendment #3.

         11.5  In the event that Cisco acquires a company that is developing or
marketing Covered RMON products, the parties agree:

               (a) at Frontier's request, Cisco shall relinquish its rights
under Section 7.2(b) of this Amendment #3 to source code for Other Software and
immediately return such source code to Frontier, and

               (b) Cisco shall relinquish its tights under Section 10 of this
Amendment #3.

12.0     PUBLICITY ON STRATEGIC RMON RELATIONSHIP. The parties agree to
publicize the strategic nature of this relationship for RMON Products with a
joint press announcement. Each party is permitted to refer to this strategic
relationship in their sales collateral and advertising. All such references to
this strategic relationship and use of the other party's name and or logos is
subject to the prior written approval of the other party.

13.      SUPPORT PAYMENTS. Section 3.4 of Amendment #2 and Section 8 of the
Software Agreement are hereby changed to include an annual support fee of [*] to
cover the following support activities: i) updates, revisions, bug fixes and new
releases of agent Software for all platforms, ii) bug, fixes for all RMON
Products; iii) on-going consulting, including architectural issues, to Cisco for
existing and future RMON Products.

14.      MANUFACTURING RIGHTS AND ESCROW. Section 10 of the Hardware Agreement
is hereby changed as follows:

                                       12


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>



         14.1  Cisco's right to manufacture is increased from [*] from the time
it is exercised. Cisco can exercise this right on a Product by Product basis and
at different times.

         14.2  Cisco's right to manufacture survives termination of the
Agreement by Cisco for cause per Section 14.2 of the Hardware Agreement.

         14.3  Any source code provided by Frontier to Cisco under the licenses
of the Agreement does not need to be deposited into the escrow as part of the
Escrowed Materials.

         14.4  The following new paragraph is hereby added to Section 10 of the
Hardware Agreement:

               "10.5 SOFTWARE LICENSE UNDER MANUFACTURING RIGHTS. In the event
Cisco exercises its Manufacturing Rights for a Product per Section 10 and
notwithstanding anything to the contrary in the Agreement, Frontier hereby
grants Cisco the additional right and license to make modifications of the Other
Software (as defined in Section 7.2(b) of this Amendment #3) for the Product
that Cisco has the right to manufacture. Cisco agrees to limit [*] within such
modifications to Other Software to those features which in Cisco's sole
discretion: (i) are required to meet committed customer requirements, (ii) are
required to maintain competitive products, or (iii) have been previously
committed for release by Cisco. Notwithstanding anything to the contrary in the
Agreement, Cisco shall retain title and full ownership to the modifications of
the Other Software made by or for Cisco for the Product that Cisco has the right
to manufacture. In addition, Cisco hereby grants to Frontier a worldwide,
irrevocable, perpetual and nonexclusive license to use, modify, copy, market,
distribute or otherwise dispose of the modifications to the Other Software made
by or for Cisco."

         14.5  The following new paragraph is hereby added to Section 10 of the
Hardware Agreement:

               "10.6 MINIMUM PERIOD OF MANUFACTURING RIGHTS. In the event Cisco
exercises its Manufacturing Rights for a Product per Section 10 and
notwithstanding anything to the contrary in the Agreement, such right shall
survive termination or expiration of the Agreement such that the minimum period
of Manufacturing Rights for a Product is 2 years, except that Manufacturing
Rights do not survive termination for cause by Frontier or termination for
convenience by Cisco."

                                       13


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>


         14.6  Replace Section 10.2 (a) of the Hardware Agreement with the
following:

               "In the event Cisco exercises its Manufacturing Rights for a
Product, Cisco agrees to pay Frontier royalties on all Products manufactured and
distributed by Cisco hereunder as follows:

               (i)   For Products that are solely Software with no hardware
                     content, Cisco shall continue to pay royalties under the
                     terms specified under the Agreement for such Products.

               (ii)  For all other Products, Cisco agrees to pay Frontier a
                     royalty equal to [*] of Cisco's then current [*].

               (iii) All royalties will be computed on a per unit basis and paid
                     quarterly within forty-five (45) days following the end of
                     each Cisco quarter."

15.      SUPPORT AFTER TERMINATION. Section 14.7 of the Hardware Agreement is
changed such that support shall be provided by Frontier for a Product until five
(5) days after the last shipment of that Product by Cisco.

16.      SUPPORT REQUIREMENTS. The following support-related changes are to be
made to the Agreement:

         16.1  Section 8.1 of the Hardware Agreement is changed by adding the
following:

         "Frontier shall include bug fixes in all subsequent releases of the
agent software and RMON Products. Support levels are defined as follows:

Level 1 Support:                    [*].

Level 2 Support:                    All Level 1 support capabilities plus:
                                    [*]

Level 3 Support:                    [*]

         16.2  Section 6.1 (Paragraph 8.15) of Amendment #2 and Section 8.6 of
the Hardware Agreement are amended to add the following:

         "Cisco shall work with Frontier while Frontier is developing products
for Cisco under a Statement of Work, to provide input on debugging/support tools
to help in Cisco's support efforts. For all new releases of Software or hardware
Products developed per Section 1.0 (Development Work) above or upgrades to
existing Products, Frontier


                                       14


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>



will provide advanced versions of Products and all supporting customer
documentation to Cisco's support organization to allow them to prepare to
support such new Products."

         16.3  Section 8.9 of the Hardware Agreement is changed to add the
following:

         "Upon verifying that a Product defect exists, Frontier shall initiate
work in accordance with the time frames for the assigned priority, toward
development of a fix or work around. If Frontier is not able to verify that a
Product defect exists, Frontier will work with Cisco to determine the source of
the problem until it has been determined that the cause is not related to a
problem with a Frontier Product. In all cases, Cisco shall use reasonable
efforts to identify and demonstrate such Software error prior to contacting
Frontier. If Frontier is unable to meet the time frames listed in Section 8.9
for a problem of any priority, Frontier will provide to Cisco within that time
frame, at a minimum, a written plan for addressing the problem, including an
estimate as to the reasonable time period necessary to correct the problem."

         16.4  Section 8. 10 of the Hardware Agreement is changed such that
Frontier will provide training for major releases/new RMON Products prior to
initial shipment of each major release/new RMON Product, for a minimum of
twenty-five (25) people at a Frontier facility, Cisco facility or facility
mutually agreed upon.

         16.5  Exhibit F of the Hardware Agreement is changed to use the
following Problem Priority Definitions:

         Priority 1: Cisco customer's network is [*] or there is [*].
[*] is available.  [*] are willing to commit [*] to resolve the situation.

         Priority 2: Operation of Cisco customer's network is [*] are being [*]
network performance. Seller, Cisco and customer are willing to commit [*] to
resolve the situation.

         Priority 3: Operational performance of Cisco customer's Network [*].
Seller, Cisco and customer are willing to [*] to restore service to satisfactory
levels.

         Priority 4: Cisco or Cisco customer requires information or assistance
on Product capabilities, installation, or configuration.

17.      SALES ACTIVITIES. The parties agree to conduct sales activities in
accordance with the following guidelines:

               (i) The parties will identify situations in which both Cisco and
Frontier sales persons are [*] ("Common Accounts") to meet customer's needs for
RMON Products.

                                       15


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>


               (ii) The two sales organizations will coordinate to determine an
effective joint selling strategy in Common Accounts. Disputes regarding joint
sales plans for Common Accounts will be resolved between the Cisco regional
sales manager and Frontier's Vice President of sales.

               (iii) Cisco and Frontier will work together in good faith to set
up a reporting system such that Frontier has adequate information relating to
sales of Products by Cisco to allow Frontier to compensate its sales personnel
for such sales.

18.      NETFLOW MONITOR DISCOUNT. Cisco's purchase price for NetFlow Monitor
shall be [*] of Frontier's U.S. list price.

19.      COST REDUCTION. The parties agree to meet no less frequently than
semi-annually to review the prices/license fees paid by Cisco for all Products
covered by this Agreement. Frontier agrees to act in good faith to maintain
competitive OEM pricing/license fees for Products sold to Cisco considering all
of the following: (i) Pricing trends in the RMON product market place; (ii)
Reductions in Frontier's costs for Products; and, (iii) Competition from other
suppliers products. Frontier shall notify Cisco [*] prior to the public
announcement of any price change to its published list price for a Frontier
product that is equivalent to a Product.

20.      NO OTHER CHANGES. Terms capitalized shall have the meaning assigned to
them in the Agreement unless specifically defined herein. All other terms and
conditions of the Agreement shall remain in full force and effect.

                                       16


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>


IN WITNESS WHEREOF, the parties have caused this Amendment to be executed by
their duly authorized representatives.




CISCO SYSTEMS, INC.                              FRONTIER SOFTWARE
                                                    DEVELOPMENT, INC.


/s/ MARIO MAZZOLA                                /s/ NARENDRA POPAT
-------------------------------------       -------------------------------
Signature                                   Signature


MARIO MAZZOLA                               NARENDRA POPAT
-------------------------------------       -------------------------------
Name                                        Name


VICE PRESIDENT/GENERAL MANAGER - WBU        PRESIDENT, FRONTIER SOFTWARE
-------------------------------------       -------------------------------
Title                                       Title


OCTOBER 29, 1996                            OCTOBER 29, 1996
-------------------------------------       -------------------------------
Date                                             Date


                                       17


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>



                                    Exhibit A

                         Template for Statement of Work





                                       18




<PAGE>


               STATEMENT OF WORK FOR THE CISCO-FRONTIER AGREEMENT

WHEREAS, Cisco and Frontier entered into the Project Development and License
Agreement on July 13, 1994 ("Software Agreement"), the Private Label Agreement
on October 17, 1995 ("Hardware Agreement"), and subsequent Amendments
(collectively, the "Agreement"); and

WHEREAS, the parties have agreed to use a Statement of Work to set the terms
under which new projects with be conducted and new Products brought under the
terms of the Agreement; and

WHEREAS, Cisco and Frontier desire to change and add certain terms of the
Agreement per this Statement of Work specifically relating to the project
identified as _________________________________ (the "Project").

NOW THEREFORE, effective as of _____________________, in consideration of the
covenants and conditions contained herein, the parties agree to the Statement of
Work for the Project as indicated below.

In order to bind the parties to the following Statement of Work, their duly
authorized representatives have signed their names below.

Cisco Systems                                  Frontier Software Development

---------------------------------              ---------------------------------
Signature                                      Signature

---------------------------------              ---------------------------------
Name                                           Name

---------------------------------              ---------------------------------
Title                                          Title


1.0     Introduction

Cisco and Frontier agree and acknowledge that this Statement of Work ("SOW") is
an amendment to the Agreement and that the Project specified herein shall be
subject to the terms and conditions of the Agreement. In the case of conflicting
terms between this SOW and the Agreement, including all earlier-dated amendments
and Statements of Work, this SOW shall prevail. The Sections of this SOW
encompass the items usually covered in a Statement of Work under this Agreement.
Where an item is not relevant to this SOW, it is left as an empty section of
sub-section. All terms not specifically included in this SOW are as specified in
the Agreement.


                                       19


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>


2.0     Project Description

3.0     New and modified Products resulting from this SOW

4.0     Applicable Documents

The documents listed below are made a part of this SOW to the extent specified
within the body of this SOW. If no revision is shown, it will be the revision in
effect as of the moment.
         4.1   Cisco Documents
         4.2   Frontier Documents
         4.3   Third Party Documents

5.0     Project Details

         5.1  Software Development

                  5.1.1  Cisco Responsibilities
                  5.1.2  Frontier Responsibilities
                  5.1.3  Deliverable & Criteria of Acceptance

         5.2  Hardware Development
                  5.2.1  Cisco Responsibilities
                  5.2.2  Frontier Responsibilities
                  5.2.3  Deliverable & Criteria of Acceptance

         5.3  Systems Integration
                  5.3.1  Cisco Responsibilities
                  5.3.2  Frontier Responsibilities
                  5.3.3  Deliverable & Criteria of Acceptance

         5.4  Documentation
                  5.4.1  Cisco Responsibilities
                  5.4.2  Frontier Responsibilities
                  5.4.3  Deliverable & Criteria of Acceptance

         5.5  Customer Advocacy, Service and Support
                  5.5.1  Cisco Responsibilities
                  5.5.2  Frontier Responsibilities
                  5.5.3  Deliverable & Criteria of Acceptance

         5.6  Other Project activities
                  5.6.1  Cisco Responsibilities
                  5.6.2  Frontier Responsibilities
                  5.6.3  Deliverable & Criteria of Acceptance

6.0      Schedule


                                       20


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.

<PAGE>


7.0      Payments
         7.1  Other Project activities
         7.2  Schedule delay penalties
         7.3  Project cancellation penalties
         7.4  Prepaid royalties
         7.5  Per unit royalties
         7.6  Upgrade payments
         7.7  Payment terms and schedule

8.0      Ownership and intellectual property rights
         8.1  Ownership of Software
         8.2  License restrictions

9.0      Other term of the SOW

                                       21


[*] indicates material that has been omitted and for which confidential
treatment has been requested. All such omitted material has been filed with the
Securities and Exchange Commission pursuant to Rule 406 promulgated under the
Securities Act of 1933, as amended.