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Cisco Bug: CSCul47945 - On SSO xlated vlan's LPSS Stale entry on old-stdby causes traffic loss

Last Modified

Mar 17, 2016

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

6.2(5.52)S0 6.2(5.65)S8 6.2(6)S1 6.2(6)S2 6.2(7)FM(0.45)

Description (partial)

Symptom:
On SSO xlated vlan's LPSS Stale entry on old-stdby causes traffic loss

Conditions:
Description:
The problem is that in this case, STP queries Vlan-mgr's LPSS to find out vlan translation information. Currently Vlan-mgr's LPSS on standby is build when the switchover is completed and when it is restoring its state from PSS.
However, during switchover, STP comes up before Vlan-mgr and starts sending BPDUs. Since the LPSS is not build till that time, first few BPDUs don't have information of translated vlan and therefore it causes traffic loss for few seconds, till LPSS is build.
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