When examining routes advertised to BGP neighbor, notice some
routes are tagged with “r”:
rtr1#sh ip bgp neighbor
10.11.19.21 advertised
BGP table version is 1735468,
local router ID is 10.115.254.254
Status codes: s suppressed, d
damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, x
best-external, f RT-Filter, a additional-path
Origin codes: i - IGP, e -
EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
r>i10.115.254.0/30
10.115.254.9 0 100
0 i
*> 10.115.254.0/23
10.115.254.9 21 32768 i
r>i10.115.254.4/30
10.115.254.9 0 100
0 i
r>i10.115.254.8/30
10.115.254.9 0 100
0 i
Note this is BGP “RIB-failure”, which indicates BGP fails to
install the route in routing table. According to this link,
the likely cause is the route is already installed by IGP which has a lower AD.
