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BGP secondary best path is not active when primary best path goes down.

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TitleBGP secondary best path is not active when primary best path goes down.
Symptoms
Initially, the switch has learned BGP route through two gateway's and one of the route is marked as active.
X670V-48t.1 # sh iproute 192.0.2.0/24
Ori  Destination        Gateway         Mtr  Flags         VLAN       Duration
#bi  192.0.2.0/24   198.51.100.1  0    UG-D---um--f- v100    0d:0h:5m:3s
bi  192.0.2.0/24   203.0.113.1   0    -G-D---um---- v200    0d:0h:5m:3s
When  primary BGP route gateway goes down (for example next-hop interface goes down), the route is removed from the routing table but secondary route is not marked as best route.
X670V-48t.2 # sh iproute 192.0.2.0/24
Ori  Destination        Gateway         Mtr  Flags         VLAN       Duration
bi  192.0.2.0/24   203.0.113.1   0    -G-D---um---- v200    0d:0h:8m:49s  <- route is not active
Environment
  • EXOS 15.x, 16.x
  • All EXOS platforms
  • BGP
Cause
The root cause of this issue is the software defect xos0065189.
Resolution
Upgrade to one of the following or newer EXOS releases:
  • 22.1.0.24
  • 21.1.2.11
  • 16.2.2.2
  • 16.1.3.6-patch1-10
As a workaround disable/enable bgp helps to recover.
Additional notes

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