FRR8.3: BGP Session is up and fine, intermittently BGP table routes are invalid and not advertising the routes to PEERs

[ssahu2021]

Problem Statement

Encountering unexpected behavior with FRR 8.3: BGP sessions remain established, but route entries in the BGP table intermittently become invalid, preventing route advertisement to peers and installation into the kernel routing table.

[ssahu2021]

BGP Table

Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

   Network          Next Hop            Metric LocPrf Weight Path
   0.0.0.0/0        1.X.X.X          10             0 XXXXX YYYYY ?
                    1.Y.Y.Y          10             0 XXXXX YYYYY ?
   1.1.1.1/32       1.X.X.X                         0 XXXXX XXXXX i
                    1.Y.Y.Y                         0 XXXXX XXXXX i

[ton31337]

Please test with latest versions, because 8.3 is not maintained anymore.