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Cisco Bug: CSCvu57503 - ipfib crash on N9k after configuring layer3 peer-router

Last Modified

Sep 16, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

9.3(2)

Description (partial)

ipfib may crash on N9k after configuring layer3 peer-router

Symptom:
Once layer3 peer-router is configured on. N9k, we could see ipfib process crash. However, it does not happen consistently.

'show accounting log'
Sat Jun 6 21:11:31 2020:type=update:id=10.248.28.79@pts/1:user=superadmin:cmd=configure terminal ; vpc domain 1 ; layer3 peer-router (SUCCESS)
Sat Jun 6 21:14:27 2020:type=update:id=vsh.bin.963:user=root:cmd=configure terminal ; vlan 1 (REDIRECT)

`show system reset-reason`
----- reset reason for module 1 (from Supervisor in slot 1) ---
1) At 743781 usecs after Sat Jun 6 21:11:54 2020
Reason: Reset triggered due to HA policy of Reset
Service: ipfib hap reset
Version: 9.3(2)

`show cores`
VDC Module Instance Process-name PID Date(Year-Month-Day Time)
--- ------ -------- --------------- -------- -------------------------
1 1 1 ipfib 2953 2020-06-06 21:13:49

Conditions:
The N9k would be receiving external bandwidth attribute from a BGP peer. The issue is due to enabling weighted-ecmp. N9k does not support it so there is an issue in processing weighted-ecmp based routes from bgp/urib that is causing the fib crash.

`show ip route detail vrf all`
 
<snip>
 
5.158.200.208/28, ubest/mbest: 1/0
    *via 172.25.47.241, [200/0], 05:42:45, bgp-64672, bw:819, internal, tag 65201
         client-specific data: 3d      
         recursive next hop: 172.25.47.241/32
         extended route information: BGP origin AS 64668 BGP peer AS 65201
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