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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)

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
Peer link: Po1 mct_vlan_bmp 108,113,118,121-122,157,163,173,178,188,191,193-194

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

This issue is seen in Nexus7000 vPC setup running 6.2.x releases
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
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