BGP Peering shuts down with "add paths tx;"

[Ondrej Zajicek]

On Tue, Jan 09, 2024 at 05:10:49PM +0100, Tim Weippert via Bird-users wrote:
> 
> Hi All,
> 
> i try to activate "add paths tx;" from my Bird2 (2.0.12) Routeserver to a Cisco IOS-XR Systems (7.9.2), after i add
> the config on Bird side, the IOS-XR shuts down the peering:
> 
> %ROUTING-BGP-3-MALFORM_UPDATE : Malformed UPDATE message received from neighbor <IPV6-RR> (VRF: INTERNET) - message length 160 bytes, error flags 0x00000008, action taken "Reset". Error details: "Error 0x00000008, Field "MP_REACH-NLRI", Attribute 14 (Flags 0x00, Length 0), Data [6d]". NLRIs: [IPv4 Unicast]
> %ROUTING-BGP-5-ADJCHANGE : neighbor <IPV6-RR> Down - BGP Notification sent, illegal network (VRF: INTERNET) (AS: 65000)
> ...
>
> Does this means, that bird doesn't add the path-id as expected?
> Is there some known caveouts around?

Hi

Well, it should work as expected.

Can you establish a session without sending anything (to not trigger the bug) and send the output of 'show protocols all'?

Or perhaps make a tcpdump/pcap of such session with updates?

-- 
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
"To err is human -- to blame it on a computer is even more so."