Document:

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                                                                 EXHIBIT (10)(r)

                       AMENDMENT TO EMPLOYMENT AGREEMENT
                       ---------------------------------

    THIS AMENDMENT TO EMPLOYMENT AGREEMENT, dated January 18, 2000, by and
between  C-COR.net CORP., a Pennsylvania  corporation (the "Company"),  and
GERHARD B. NEDERLOF (the "Employee").

                                  BACKGROUND
                                  ----------

     A. The Employee and the Company entered into an Employment Agreement on
July 30, 1997 (the "Employment Contract").

     B. Section 5.01 of the Employment Contract provides certain measures and
protections for the Employee in the event of a change of control of the Company.

     C. The Company and the Employee have mutually determined that the Change of
Control Agreement used by the Company generally for its executive employees
should be modified and that an Amended and Restated Change of Control Agreement
should be entered into between the Company and the Employee.

     D. On even date herewith, the Company and the Employee have entered into an
Amended and Restated Change of Control Agreement.

     E. The Company and the Employee mutually desire to amend the Employment
Contract to delete Section 5.01 concerning change of control provisions which
will be replaced by the Amended and Restated Change of Control Agreement.

     NOW, THEREFORE, the parties to this Amendment to Employment Agreement,
intending to be legally bound, agree as follows:

     1. Effective as of the date of this Amendment to Employment Agreement,
Section 5.01 of the Employment Contract concerning change of control, is deleted
and shall be of no
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further force and effect.

     2. In all other respects, the Employment Contract is ratified and affirmed
and shall continue in accordance with its terms.

     3. This Agreement shall be binding upon the successors, heirs, personal
representatives and assigns of each party.

                                    C-COR.net CORP.

                                 By: /s/ David A. Woodle
                                    ----------------------------------

                              Title: President & CEO
                                    ----------------------------------

                                    THE EMPLOYEE:

                                    /s/ Gerhard B. Nederlof
                                    ----------------------------------
                                    Gerhard B. Nederlof

                                       2<PAGE>

                                                                EXHIBIT (10)(aa)

                       AMENDMENT TO EMPLOYMENT AGREEMENT
                       ---------------------------------

    THIS AMENDMENT TO EMPLOYMENT AGREEMENT, dated January 18, 2000, by and
between  C-COR.net CORP., a Pennsylvania  corporation (the "Company"),  and
DAVID A. WOODLE (the "Employee").

                                  BACKGROUND
                                  ----------

     A. The Employee and the Company entered into an Amended and Restated
Employment Agreement on September 14, 1999 (the "Employment Contract").

     B. Section V of the Employment Contract provides certain measures and
protections for the Employee in the event of a change of control of the Company.

     C. The Company and the Employee have mutually determined that the Change of
Control Agreement used by the Company generally for its executive employees
should be modified and that an Amended and Restated Change of Control Agreement
should be entered into between the Company and the Employee.

     D. On even date herewith, the Company and the Employee have entered into an
Amended and Restated Change of Control Agreement.

     E. The Company and the Employee mutually desire to amend the Employment
Contract to delete Section V concerning change of control provisions which will
be replaced by the Amended and Restated Change of Control Agreement.

     NOW, THEREFORE, the parties to this Amendment to Employment Agreement,
intending to be legally bound, agree as follows:

     1. Effective as of the date of this Amendment to Employment Agreement,
Section V of the Employment Contract concerning change of control, is deleted
and shall be of no further
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force and effect.

     2. In all other respects, the Employment Contract is ratified and affirmed
and shall continue in accordance with its terms.

     3. This Agreement shall be binding upon the successors, heirs, personal
representatives and assigns of each party.

                                    C-COR.net CORP.

                                 By: /s/ Richard E. Perry
                                    ----------------------------------

                              Title: Chairman
                                    ----------------------------------

                                    THE EMPLOYEE:

                                     /s/ David A. Woodle
                                    ----------------------------------
                                    David A. Woodle

                                       2<PAGE>

                                                                EXHIBIT (10)(bb)

                             AMENDED AND RESTATED
                          CHANGE OF CONTROL AGREEMENT
                          ---------------------------

     THIS AMENDED AND RESTATED AGREEMENT, dated January 18, 2000 by and between
C-COR.net Corp., a Pennsylvania corporation (the "Company"), AND
________________________________ (the "Employee").

                                    Recital
                                    -------

     A.   Employee is an executive of the Company with significant policy making
and operational responsibilities in the conduct of the Company's business.

     B.   The Company recognizes that Employee is a valuable resource for the
Company and the Company desires to be assured of the continued service of
Employee.

     C.   The Company is concerned that upon a possible or threatened change in
control (as defined below), Employee may have concerns about the continuation of
his/her employment and/or his/her status and responsibilities and may be
approached by others with employment opportunities, and desires to provide
Employee some assurance as to the continuation of his/her employment status and
responsibilities on a basis consistent with that which he/she has earned in the
event of such possible or threatened change in control.
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     D.   The Company desires to assure that if a possible change in control
situation arises and Employee is involved in deliberations or negotiations in
connection therewith, that Employee would be in a secure position to consider
and/or negotiate such transaction as objectively as possible and without implied
threat to his/her financial well-being.

     E.   The Company is concerned about the possible effect on Employee of the
uncertainties created by any proposed change in control of the Company.

     F.   Employee is willing to continue to serve but desires that in the event
of such a change in control he/she will continue to have the responsibility,
status, income, benefits and perquisites that he/she received immediately prior
to that event.

     G.   The Company and Employee have previously entered into a Change of
Control Agreement (the "Original Agreement") and now desire to change their
rights and obligations with respect to a change in control.

    H.    The Company and Employee hereby amend and restate the Original
Agreement in its entirety as follows.

                                       2
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                                  Agreements
                                  ----------

     The parties do hereby agree as follows:

     1.   Change in Control. The provisions of Section 2, 3 and 4 of this
Agreement shall become operative upon a change in control of the Company, as
hereinafter defined. For purposes of this Agreement, a "change in control" shall
be deemed to have occurred if and when:

          (a)  Subsequent to the date of this Agreement, any person or group of
persons acting in concert shall have acquired ownership of or the right to vote
or to direct the voting of shares of capital stock of the Company representing
30% or more of the total voting power of the Company, or

          (b)  The Company shall have merged into or consolidated with another
corporation, or merged another corporation into the Company, on a basis whereby
less than 50% of the total voting power of the surviving corporation is
represented by shares held by former shareholders of the Company prior to such
merger or consolidation, or

          (c)  The Company shall have sold more than 50% of its assets to
another corporation or other entity or person, or

          (d)  As the result of, or in connection with, any cash tender or
exchange offer, merger or other business combination, sale of assets or
contested election, the persons who were

                                       3
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Directors of the Company before such transaction cease to constitute a majority
of Directors of the Company.

     2.   Acceleration of Options Upon Change in Control. In the event of a
change in control (without regard to whether the Employee's employment is
terminated by reason of the change in control), all outstanding options held by
the Employee, both exercisable and nonexercisable, shall be immediately
exercisable regardless of the time the option has been held by Employee and
shall remain exercisable until their original expiration date, subject to
applicable requirements of the Internal Revenue Code (the "Code").

     3.   Termination Within Eighteen (18) Months. In the event that the
employment of Employee with the Company is terminated involuntarily, other than
for gross misconduct, within eighteen (18) months after a change in control
occurs:

          (a)  Employee shall be entitled to receive an amount of cash equal to
the sum of the following amounts:

               (i)  two (2) times his/her annual salary at his/her rate on the
date of termination of employment (but not less than two times Employee's annual
salary prior to the change in control); and

               (ii) an amount equal to two (2) times the annual amount of the
Company's matching contributions with respect to the Employee's Employee-
Directed Contributions to the C-COR Electronics, Inc. Retirement Savings and
Profit Sharing Plan (the

                                       4
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"401(k) Plan") and deferral contributions to the C-COR Electronics, Inc.
Supplemental Executive Retirement Plan (the "SERP"), determined based on the
rate(s) of the Company's matching contribution(s) and the rate(s) of the
Employee's deferral contribution(s) to the 401(k) Plan and SERP, as applicable,
on the date of the Employee's termination of employment (but not less than such
rates as in effect on the date immediately preceding the change in control.)
Such amount shall be paid to the Employee in a single sum in cash and shall not
be contributed to either the 401(k) Plan or the SERP; and

               (iii) if the Employee terminates employment with the Company
during but before the last day of a plan year for which the Company makes an
Employer Discretionary Contribution to the 401(k) Plan, an amount equal to the
amount that would have been contributed as an Employer Discretionary
Contribution to the 401(k) Plan with respect to the Employee, based on his/her
actual compensation for the plan year taken into account for purposes of the
401(k) Plan, and assuming that he/she had satisfied all other requirements
(e.g., 1000 hours, employment on the last day of the plan year) needed to share
in the allocation of such contribution. Such amount will be paid to the Employee
as soon as practicable after the Company's Employer Discretionary Contribution
for the plan year is paid to the 401(k) Plan; and

               (iv)  if the Employee terminates employment with the Company
prior to acquiring a 100% nonforfeitable interest in, as applicable, his/her
Employer Matching Contribution Account and Employer Discretionary Contribution
Account under the 401(k) Plan and/or his Employer Matching Contribution Account
under the SERP, an amount equal to the fair market value of the nonvested
portion of such account(s) under the 401(k) Plan and the

                                       5
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SERP, determined as of the date the Employee terminates employment with the
Company and including the value of any investment earnings accrued with respect
to the nonvested portion of such account(s) which have accrued but are
unallocated as of such date; provided however, that if the Employee should be
                             ----------------
re-employed by the Company and receive the restoration of the nonvested portion
of his/her Employer Matching Contribution Account and/or Employer Discretionary
Contribution Account under the 401(k) Plan, then the Employee shall be
obligated, within 30 days of the Company's demand following such restoration, to
repay the full amount that had been paid to him/her under this paragraph
3(a)(iv) representing the fair market value of his/her nonvested account(s)
under the 401(k) Plan.

          (b) Employee shall be entitled to receive an amount of cash equal to
two times the average of the Profit Incentive Plan or the successor to such plan
("PIP") payments of the last two years awarded to him/her under the PIP of the
Company, pursuant to the terms of such PIP as in effect immediately prior to
such change in control. Such amount will be paid to the Employee within ten (10)
days after termination of employment. If the Employee has not received PIP
payments for eight full quarters at the officer level, the average annual PIP
will be calculated by averaging the number of full quarters for which Employee's
officer level PIP has been accrued (whether already paid or not paid) and
annualizing that amount.

          (c) Employee shall continue for a period of 24 months from the date of
his termination to be covered at the expense of the Company by the same or
equivalent health, dental, accident, life and disability insurance coverages as
he/she was enrolled in immediately prior to termination of his/her employment;
provided, however, that Employee may elect to be

                                       6
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paid in cash within thirty (30) days after termination of his/her employment an
amount equal to the Company's cost of providing such coverages during such
period.

          (d) If on the date of termination of employment, Employee were a
participant in the Company's Supplemental Retirement Plan or the successor to
such plan (the "CSRP"), Employee shall become eligible for the benefits payable
under such CSRP and such benefits shall be paid to Employee, or if applicable,
Employee's beneficiary, in the same manner, amounts and intervals as if Employee
had, on the date of his/her termination of employment following a change in
control, met the age and service requirements for normal retirement as defined
in Section 3(a) of the CSRP. In the event the Employee's benefit from the CSRP
begins to be paid before age 65, it shall not be actuarially adjusted to reflect
its early commencement, notwithstanding any provision to the contrary in the
CSRP.

     4.   Other Events. If Employee resigns from the Company within eighteen
(18) months after a change in control due to a "Good Reason", Employee shall be
entitled to receive all payments and enjoy all of the benefits specified in
Section 3 hereof. For purposes of this Agreement, a "Good Reason" shall be if
any one or more of the following events has occurred between the change in
control and Employee's resignation:

          (a) A reduction or alteration in the nature or status of Employee's
authorities, duties or responsibilities from those in effect immediately prior
to the change in control; or

          (b) If the base salary paid by the Company to Employee is reduced by

                                       7
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more than ten (10%) percent from his/her salary immediately prior to the change
in control; or

          (c) If the Company requires Employee to relocate his/her principal
place of work to a location more than forty (40) miles from the Employee's
former place of work.

     5.   Excise Tax Gross-Up.

          (a) Anything in this Agreement to the contrary notwithstanding, in the
event it shall be determined that (i) any payment by the Company to or for the
benefit of the Employee pursuant to Sections 3 and 4 of this Agreement, or a
portion thereof (a "Payment"), or (ii) any actual or deemed compensation income
to the Employee, for purposes of Section 280G of the Code, resulting from the
acceleration of the exercisability of the Employee's outstanding options
pursuant to Section 2 of the Agreement ("Option Income"), would be subject to
the excise tax imposed by Section 4999 of the Code (relating to excess parachute
payments as described in Section 280G of the Code) (the "Excise Tax"), the
Employee shall be entitled to receive from the Company an additional payment (a
"Gross-Up Payment") in an amount such that after payment by the Employee of all
taxes (but not including any interest or penalties imposed with respect to such
taxes), including any Excise Tax, imposed upon the Gross-Up Payment, the
Employee retains an amount of the Gross-Up Payment equal to the Excise Tax
imposed upon the Payment and/or Option Income.

                                       8
<PAGE>

          (b) All determinations required to be made under this Section 5,
including whether a Gross-Up Payment is required, the amount of such Gross-Up
Payment and amounts relevant to the last sentence of this Section 5(b), shall be
made by the firm of independent accountants engaged to audit the Company's
financial statements (the "Accounting Firm") which shall provide its
determination (the "Determination"), together with detailed supporting
calculations regarding the amount of any Gross-Up Payment and any other relevant
matter, both to the Company and the Employee within thirty (30) business days
after (i) in the case of Option Income, the date of the change in control or
such later date as such Option Income is treated as a payment in the nature of
compensation for purposes of Section 280G of the Code, or (ii) the date the
Employee terminates employment with the Company eligible for Payments under
Section 3 or 4 of this Agreement (or such earlier time as is requested by the
Company). If the Accounting Firm determines that no Excise Tax is payable by the
Employee, it shall furnish the Employee with a written statement that such
Accounting Firm has concluded that no Excise Tax is payable (including the
reasons therefor) and that he or she has substantial authority not to report any
Excise Tax on his or her federal income tax return. If a Gross-Up Payment is
determined to be payable, it shall be paid to the Employee within ten (10)
business days after the Determination is delivered to the Company. Any
determination by the Accounting Firm shall be binding upon the Company and the
Employee with respect to the Company's obligation to pay the Gross-Up Payment,
absent manifest error. As a result of uncertainty in the application of Section
4999 of the Code at the time of the initial determination by the Accounting Firm
hereunder, it is possible that a Gross-Up Payment not made by the Company should
have been made (an "Underpayment"), or that a Gross-Up Payment will have been
made by the Company which should not have been made (an "Overpayment"). In
either such event, the Accounting Firm shall

                                       9
<PAGE>

determine the amount of the Underpayment or Overpayment that has occurred. In
the case of an Underpayment, following a final determination by a court or the
Internal Revenue Service that any portion of the Payment or Option Income is
subject to Excise Tax, the amount of such Underpayment shall be promptly paid by
the Company to or for the benefit of the Employee. In the case of an
Overpayment, the Employee shall, at the direction and expense of the Company,
take such steps as are reasonably necessary (including the filing of returns and
claims for refund), follow reasonable instructions from, and procedures
established by, the Company, and otherwise reasonably cooperate with the Company
to correct such Overpayment; provided, however, that (i) the Employee shall not
                             --------  -------
in any event be obligated to return to the Company an amount greater than the
net after-tax portion of the Overpayment that he or she has retained or has
recovered as a refund from the applicable taxing authorities and (ii) this
provision shall be interpreted in a manner consistent with the intent of Section
5(a), which is to make the Employee whole, on an after-tax basis, from the
application of the Excise Tax, it being understood that the correction of an
Overpayment may result in the Employee repaying to the Company an amount which
is less than the Overpayment.

     6. Agreements Not Exclusive. The specific agreements referred to herein are
not intended to exclude Employee's participation in other benefits available to
executive personnel generally or to preclude other compensation benefits as may
be authorized by the Board of Directors of the Company at any time, and shall be
in addition to the provisions of any other employment or similar agreements.

     7. Enforcement Costs. The Company is aware that upon the occurrence of a

                                       10
<PAGE>

change in control, the Board of Directors or a shareholder of the Company may
then cause or attempt to cause the Company to refuse to comply with its
obligations under this Agreement, or may cause or attempt to cause the Company
to institute, or may institute, litigation seeking to have this Agreement
declared unenforceable, or may take, or attempt to take, other action to deny
Employee the benefits intended under this Agreement. In these circumstances, the
purpose of this Agreement could be frustrated. It is the intent of the Company
that Employee not be required to incur the expenses associated with the
enforcement of his/her rights under this agreement by litigation or other legal
action because the cost and expense thereof would substantially detract from the
benefits extended to Employee hereunder, nor be bound to negotiate any
settlement of his/her rights hereunder under threat of incurring such expenses.
Accordingly, if following a change in control, it should appear to Employee that
the Company has failed to comply with any of its obligations under this
Agreement or in the event that the Company or any other person takes any action
to declare this Agreement void or unenforceable, or institutes any litigation or
other legal action designed to deny, diminish or to recover from Employee the
benefits intended to be provided to Employee hereunder and that Employee has
complied with all reasonable obligations related to Employee's employment with
the Company, the Company irrevocably authorizes Employee from time to time to
retain counsel of his/her choice at the direct expense and liability of the
Company as provided in this Section 7, to represent Employee in connection with
the initiation or defense of any litigation or other legal action, whether by or
against the Company or any director, officer, shareholder or other person
affiliated with the Company, in any jurisdiction. Notwithstanding any existing
or prior attorney-client relationship between the Company and such counsel, the
Company irrevocably consents to Employee entering into an attorney-client
relationship with such counsel, and in that connection

                                       11
<PAGE>

the Company and Employee agree that a confidential relationship shall exist
between Employee and such counsel. The reasonable fees and expenses of counsel
selected from time to time by Employee as hereinabove provided shall be paid or
reimbursed to Employee by the Company on a regular, periodic basis upon
presentation by Employee of a statement or statements prepared by such counsel
in accordance with its customary practices up to a maximum aggregate amount of
$500,000, said amount to be "grossed up" to cover federal and state income
taxes. The amount of the gross up shall be calculated in accordance with the
following formula: A/ (1-R), where A is the amount of legal fees and R is the
combined highest marginal tax rate applicable to employee in the tax year that
the payment is made.

     8. No Set-Off. The Company shall not be entitled to set-off against the
amount payable to Employee any amounts earned by Employee in other employment
after termination of his/her employment with the Company, or any amounts which
might have been earned by Employee in other employment had he/she sought other
employment. The amounts payable to Employee under this Agreement shall not be
treated as damages but as severance compensation to which Employee is entitled
by reason of termination of his/her employment in the circumstances contemplated
by this Agreement. However, a set-off may be taken by the Company against the
amounts payable to Employee for expenses covering the same or equivalent
hospital, medical, accident, and disability insurance coverages as set forth in
Section 3(c) of this Agreement if such benefits are paid for the Employee by a
new employer after Employee's termination of employment by the Company under
Section 3 hereof or after Employee's resignation under Section 4 hereof.

                                       12
<PAGE>

     9.  Termination. This Agreement has no specific term, but shall terminate
if, prior to a change in control of the Company, the employment of Employee with
the Company shall terminate, so long as such termination was not in anticipation
of or related to change in control.

     10. Successors and Assigns. This Agreement shall be binding upon and inure
to the benefit of the Company and its successors and assigns, and shall be
binding upon and inure to the benefit of Employee and his/her legal
representatives, heirs, and assigns. The Company shall require any successor or
surviving entity in any change in control ("Successor"), by agreement in form
and substance satisfactory to Employee, expressly to assume and agree to perform
this Agreement in the same manner and to the same extent that the Company would
be required to perform if no such succession had taken place. Regardless of
whether such agreement is executed, this Agreement shall be binding upon any
Successor in accordance with the operation of law and such Successor shall be
deemed the "Company" for purposes of this Agreement. This Agreement shall inure
to the benefit of and be enforceable by Employee and his/her personal or legal
representative, executors, administrators, successors, heirs, distributees,
devisees and legatees.

     11. Severability. In the event that any Section, paragraph, clause or other
provision of this Agreement shall be determined to be invalid or unenforceable
in any jurisdiction for any reason, such Section, paragraph, clause or other
provision shall be enforceable in any other jurisdiction in which valid and
enforceable and, in any event, the remaining Sections, paragraphs, clauses and
other provisions of this Agreement shall be unaffected and shall remain in full
force and effect to the fullest extent permitted by law.

                                       13
<PAGE>

     12. Governing Law. This Agreement shall be interpreted, construed and
governed by the laws of the Commonwealth of Pennsylvania.

     13. Headings. The headings used in this Agreement are for ease of reference
only and are not intended to affect the meaning or interpretation of any of the
terms hereof.

     14. Gender and Number. Whenever the context shall require, all words in
this Agreement in the male gender shall be deemed to include the female or
neuter gender, all singular words shall include the plural, and all plural words
shall include the singular.

     IN WITNESS WHEREOF, this Agreement has been executed the date and year
first above written.

ATTEST:                                     C-COR.net Corp.

_________________________               By: ___________________________________

                                            ___________________________________
                                            Employee

                                       14

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