Hello everyone,
I have a Debian router that’s running bird2 off of the Debian repo (2.0.12-7).
This also occurred on 2.0.7-4.1.
It is using only BGP, with 9 IPv4 + 9 IPv6 peers. It’s in a private environment
with < 100 routes on the RIB.
When I’m running “show route table master6” (happens on v4 too), I see some
normal routes, e.g.:
2a0d:3dc0:500::216:50/128 unicast [peer1_v6 2023-12-02] * (100) [AS65000i]
via 2a0d:3dc0:501::a1 on if4
But I also see some routes that have a “!” Instead of the “*”:
2a0d:3dc0:500::216:48/128 unicast [peer1_v6 2023-12-06] ! (100) [AS65000i]
via 2a0d:3dc0:501::a1 on if4
I couldn’t find exactly what “!” means in the docs, and some quick searching in
the git repo wasn’t successful either, but I probably missed something. I’d
expect it to mean unreachable, invalid, or something similar.
AS 65000 in this case advertises ::32 - ::64 from the exact same router, 2 ASNs
away from this device. Around 8 of the routes work with “*” while the rest are
marked with “!”. This seems to be happening to the same routes, even after
reboots of all involved routers. It’s also present in routes advertised from
the direct peer. Although all routes have the same next hop, AS path, origin,
etc. some are marked with “!”.
These routes are not in the kernel FIB (not present in ip -6 r s). But they are
exported by the kernel2 protocol:
bird> show route export kernel2
Table master6:
2a0d:3dc0:500::216:48/128 unicast [peer1_v6 2023-12-06] ! (100) [AS65000i]
via 2a0d:3dc0:501::a1 on if4
The config exports everything for debugging:
protocol kernel {
ipv6 { export all; };
}
Does anyone know what’s the best approach in troubleshooting this?
Thanks!
