Symptoms

The one Cisco CATALIST switch and 2 BIG-IP WCCP works perfect. The one Cisco NEXUSswitch and 2 BIG-IP WCCP does not work together. The difference is in the "WCCP Message Type: 2.0 I see you (11)" generated by NEXUS router. Existing code did not support offset (expect "Number of elements" always equal 0) as CATALIST and other switches set. But NEXUS use this element and it produce some offset in frames. As result BIG-IP can't understand it for case 1 NEXUS and two (or more) BIG-IP's This point is badly described in WCCP draft and investigation was based on WireShark dissector.

Impact

1 NEXUS and two (or more) BIG-IP's can't work together.

Conditions

1 NEXUS and two (or more) BIG-IP's have interability problem

Workaround

avoid such configuration.

Fix Information

Problem was fixed and it is working perfect now.

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips