Hi Alexander,
Suggest you confirm with the BGP route selection algorithm bgp_rte_better,
the option "prefer older" will work only when all pervious selection options
are the same.
Best Regards,
Arvin Gan
-----Original Message-----
From: Bird-users <bird-users-boun...@network.cz> On Behalf Of Alexander Shikov
Sent: Monday, May 13, 2019 5:49 PM
To: bird-users@network.cz
Subject: 'prefer older' does not work?
Hello!
All of our BGP peers have 'prefer older' option enabled.
But I noticed that best route is not the oldest one:
bird> show route for 91.226.190.1 all
91.226.190.0/24 via 193.25.181.44 on bge0 [ITSTARCOM 2019-05-10 11:05:56] *
(100) [AS50981i]
Type: BGP unicast univ
BGP.origin: IGP
BGP.as_path: 48422 50981
BGP.next_hop: 193.25.181.44
BGP.local_pref: 100
BGP.community: (65005,10804) (31210,31210)
BGP.ext_community: (rt, 31210, 31210)
via 193.25.180.141 on bge0 [SATELLITE 2019-05-09 15:16:08]
(100) [AS50981i]
Type: BGP unicast univ
BGP.origin: IGP
BGP.as_path: 44416 50981
BGP.next_hop: 193.25.180.141
BGP.local_pref: 100
BGP.community: (44416,2) (65005,10804) (31210,31210)
BGP.ext_community: (rt, 31210, 31210)
What am I missing?
Thanks!
--
Alexander Shikov
Technical Staff, Digital Telecom IX
Tel.: +380 44 201 14 07
Mob.: +380 50 410 30 57
http://dtel-ix.net/
