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Cisco Bug: CSCuq43114 - N5K bpduguard enabled port in unknown forwarding after upgrade

Last Modified

Sep 09, 2019

Products (7)

  • Cisco Nexus 5000 Series Switches
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 6004 Switch
  • Cisco Nexus 6001 Switch
  • Cisco Nexus 5548UP Switch
  • Cisco Nexus 5596T Switch

Known Affected Releases

6.0(2)N2(1)

Description (partial)

Symptom:
We have two n5k chassis and ISSU was performed on both of them from 6.0(2)N2(1) to 6.0.(2)N2(3). Both the chassis have VPC+ configured and the issue was seen on a normal VPC.

switch# sh spanning-tree mst interface port-channel 1
 
Po1 of MST0 is designated forwarding 
Port Type: edge           (enable edge trunk) port guard : none        (default)
Link type: point-to-point (auto)              bpdu filter: disable     (default)
Boundary : internal                           bpdu guard : enable      (default)
Bpdus sent 1, received 0
 
Instance Role Sts Cost      Prio.Nbr Vlans mapped
-------- ---- --- --------- -------- -------------------------------
0        Desg FWD 200       128.4096 none
 
Po1 of MST1 is unknown forwarding 
Port Type: edge           (enable edge trunk) port guard : none        (default)
Link type: point-to-point (auto)              bpdu filter: disable     (default)
Boundary : internal                           bpdu guard : enable      (default)
Bpdus (MRecords) sent 1, received 0
 
Instance Role Sts Cost      Prio.Nbr Vlans mapped
-------- ---- --- --------- -------- -------------------------------
1        Unkw FWD 200       128.4096 1-4094

Conditions:
N5Ks has vpc+ and normal VPC. Issue was seen after ISSU
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