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Cisco Bug: CSCvu34292 - After loop is removed, a vPC peer L2RIB does not learn a remote mac, but BGP has it

Last Modified

Jun 16, 2020

Products (1)

  • Cisco MDS 9000 NX-OS and SAN-OS Software

Known Affected Releases

9.3(4.40)

Description (partial)

Symptom:
After a loop is removed bet a leaf TOR101 eth 1/2 and vPC leafs (TOR301 & TOR302) PO1, one vPC Peer (TOR301) does not learn the remote mac route of  evi 1204 mac 0005.19aa.0000, but its BGP has the remote route .

The loop for vlan 1204  was SLD-blocked on vPC leafs (TOR301 & TOR302). 
 
The mac route is originated from the same site vPC based MS BGW TOR51 & TOR52 (4.0.0.51) as an orphan port host.     
 
Meanwhile, the other vPC peer (TOR302) learns the remote mac route.

Conditions:
After access side loop between VXLAN EVPN enabled Leaf switches.
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