Parsing some l2vpn-evpn messages causes session flap

[ottorei]

With version 4.2.21 peering with Juniper MX router as a route reflector client with family l2vpn-evpn, the BGP-session seems to constantly flap. Attachment contains the last errors being logged on ExaBGP side.

[exa-errors.txt]

[thomas-mangin]

Please provide enough information for me to help. Output of the full log using exabgp -d.

[ottorei]

The full log file would be quite large since there are over 100k evpn routes being received. Would it help to capture the single raw message that causes this issue? Also, the full log file would expose sensitive information about the production network

[thomas-mangin]

When using -d the logs contain the exchanged open messages and shared updates. The lines with the opens and way down the update before the crash is what I would need.
A few other working similar updates would also be good to add to the test suite.
Thank you

[thomas-mangin]

Also please check with the main branch as this is where I will fix it.

[ottorei]

When using -d the logs contain the exchanged open messages and shared updates. The lines with the opens and way down the update before the crash is what I would need. A few other working similar updates would also be good to add to the test suite. Thank you

Thanks. Perhaps this log has this information. At least there is one working decode before the crash.
[exa-mpls-evpn-debug.txt]

[ottorei]

Any change getting this fix merged on 4.2 release?

[thomas-mangin]

@ottorei I could backport but no one confirmed that the change worked as expected.

[ottorei]

@ottorei I could backport but no one confirmed that the change worked as expected.

I'll patch my local instance and try it later this week.