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Cisco Bug: CSCus12019 - Continuous FCF-MAC address updates hogging the FWM

Last Modified

Feb 01, 2017

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

2.2(1d)A 2.2(3)

Description (partial)

Symptom:
MAC address table on the FI not getting updated immediately after a MAC move/change

Conditions:
1. Using FCoE uplink on the FI
2. FWM logs filled with MAC move requests for the FCF-MAC:

[Tue Dec  9 16:23:07 2014 173535 usecs] fwm_mac.c:1639::fwm_mac_update;mac update: attempt to move a static mac address that is configured fixed (mac 002a.6a8e.fbf4 CDCE 2300.00bc.0a02 vlan 1.311 if 0x160000cc rem_if 0x0 cfg 0 fix
[Tue Dec  9 16:23:07 2014 173270 usecs] fwm_api.c:347::fwm_api_mac_update;fwm_api_mac_update(347): Mac Cannot update: rc 0x41e80042
 
There will be more than 2000 MAC move requests per second.

The FWM logs can be checked from:

FI-A# connect nxos
FI-A(nxos)# show platform fwm info trace
Note: Due to large buffer size the trace is being saved to volatile:fwm_trace_log
 
FI-A(nxos)# exit
FI-A# connect local-mgmt
FI-A(local-mgmt)# show file volatile:/fwm_trace_log
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