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Cisco Bug: CSCuj62175 - 4500 VSS EVN no connectivity after applying and removing CTS

Last Modified

Jul 21, 2014

Products (1)

  • Cisco IOS

Known Affected Releases

15.2(2.1)

Description (partial)

Symptom:
On the 4500 VSS platform connected to some switch once CTS is applied and removed from the interface, there is no more connectivity in all VRFs - no arp entry. 4500 VSS drops ARP response.

Once debug k5cpumapacketdropped is enabled we can see the following:

*Oct  3 13:54:41.914: Packet Dropped: Reason: Packet has no local txInfos EventCode 33 Port ? Vlan 65535 FwdVlan 65535Src 00:08:E3:FF:FC:28 Dst 00:1B:2A:67:FD:3F Type/Len 0x8100

and the packet never gets back to other end so we can see incomplete ARP entry on the switch connected to the VSS.

Conditions:
When cts is applied and removed from the interface where vnet trunk is configured
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