Even after enabling ECMP (maximum-paths 2) - only one route is selected as best one #14030

sakthishanmugam02 · 2023-07-17T11:54:10Z

sakthishanmugam02
Jul 17, 2023

Current configuration:
!
frr version 8.0
frr defaults traditional
hostname drs-test-zone-1-instance
log file /var/log/frr/bgpd.log
log syslog informational
no ip forwarding
no ipv6 forwarding
!
debug zebra nexthop
debug bgp nht
debug bgp updates in
debug bgp updates out
debug bgp zebra
debug bgp bfd
!
debug route-map
!
router bgp 64521
 no bgp ebgp-requires-policy
 no bgp network import-check
 neighbor 10.250.1.6 remote-as 64524
 neighbor 10.250.1.6 ebgp-multihop 255
 neighbor 10.250.64.5 remote-as 64522
 neighbor 10.250.64.5 ebgp-multihop 255
 neighbor 10.250.128.4 remote-as 64523
 neighbor 10.250.128.4 ebgp-multihop 255
 !
 address-family ipv4 unicast
  maximum-paths 2
 exit-address-family

drs-test-zone-1-instance# show ip bgp
BGP table version is 16, local router ID is 10.250.0.5, vrf id 0
Default local pref 100, local AS 64521
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
*  10.10.100.0/24   10.250.128.4             0             0 64523 i
*                   10.250.64.5              0             0 64522 i
*>                  10.250.1.6               0             0 64524 i

drs-test-zone-1-instance# show ip route
Codes: K - kernel route, C - connected, S - static, R - RIP,
       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
       T - Table, v - VNC, V - VNC-Direct, F - PBR,
       f - OpenFabric,
       > - selected route, * - FIB route, q - queued, r - rejected, b - backup
       t - trapped, o - offload failure

K * 0.0.0.0/0 [0/100] via 10.250.0.1, ens3, src 10.250.0.5, 03w3d17h
K>* 0.0.0.0/0 [0/0] via 10.250.0.1, ens3, 03w3d17h
B>  10.10.100.0/24 [20/0] via 10.250.1.6 (recursive), weight 1, 00:00:40
  *                         via 10.250.0.1, ens3, weight 1, 00:00:40