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C7505, RSP2, FEIP controller, duplex negotiation matter

Our customer is using C7507 as following

- IOS : IOS (tm) RSP Software (RSP-JSV-M), Version 12.1(4), RELEASE SOFTWARE (fc1)

- RSP2 : HW rev 1.02, board revision H0

- FEIP : FEIP controller, HW rev 2.02, board revision D1

- FEPA : Fast-Ethernet PA, 1 port, 100BaseTX-nISL

EEPROM format version 1

HW rev 1.00, Board revision ^@P

Currently we are providing 100Mbps with L3 switch.

The configruation is like this.

L3 switch --- L2 with media conver and 10/100 --- C7505 FEPA

We found that collisions and late collision are increasing at FEPA in C7507

and CRC errors in L2 10/100 port.

At that time I configured both device (C7507 and L2) with 100M full duplex.

When I chage the L2 with 100M auto negotiation, L2 port chaged to 100M half.

Could you recommend any solution to solve the collisions.

Thanks

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