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Cisco Bug: CSCuq53321 - L2FM doesnt have all vlans mapped to peer-link - mct_vlan_bmp incomplete

Last Modified

Sep 17, 2019

Products (8)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch

Known Affected Releases

6.2(10)S53 6.2(8a)

Description (partial) 

Symptom:
Traffic across peer-link is not sent correctly resulting in traffic loss.
Control-plane protocols like HSRP may get out-of-sync.
mac-address not synced correctly between the vPC peers.

Good side:
N7K-B#show system internal l2fm info detail
<snip>
Peer link: Po1 mct_vlan_bmp 108,113,118,121-122,157,163,173,178,188,191,193-194
<snip>

Broken side:
N7K-A#show system internal l2fm info detail
<snip>
Peer link: Po1 mct_vlan_bmp 108,113,118,121-122,157,173,178,188,191,193-194 <<== Vlan 163 missing
<snip>

Conditions:
This issue is seen in Nexus7000 vPC setup running 6.2.x releases
AND
vPC peers has vPC ports in access mode.

This issue occurs when vPC access ports and vPC peer-links come up at the same time.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
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