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Cisco Bug: CSCua81965 - N3K peer-gateway affects vlans not allowed in PL

Last Modified

Mar 19, 2019

Products (4)

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3064 Switch
  • Cisco Nexus 3016 Switch
  • Cisco Nexus 3048 Switch

Known Affected Releases

5.0(3)U3(2)

Description (partial)

Symptom:

Nexus3000 installs host entry into its hardware for non vPC vlans if peer-gateway is enabled, which causes OSPF neighbor adjacency not to be established.
As a result, OSPF neighbor in vlans, which is not allowed in peer-link but goes on other link, experiences stack in EXSTART then DOWN because OSPF DBD packet which has TTL=1 
can not reach the destination vPC switch. Not only OSPF DBD packets but also any other kind of packets with TTL=1 will be punted to CPU of vPC peer switch 
in the transit path which prevents the packets from reaching the destination vPC switch. 

Conditions:

peer-gateway is enabled.
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