BGP Capability negotiation failed

[jack9603301]

Description

I have three devices: two LFS-based Linux systems and one Ubuntu system. BGP communication between one of the LFS systems and the Ubuntu server initially failed, but was restored after recompilation. However, the other two LFS systems, after being recompiled using the same method, consistently report errors.

One of the systems outputs the following error:

2026/02/02 05:39:04 BGP: [JG0WZ-7X009][EC 33554504] 192.168.2.20 unrecognized capability code: 76 - ignored
2026/02/02 05:39:05 BGP: [GYHDK-S2BXG] peer 192.168.2.20, EOR_required 0
2026/02/02 05:39:06 BGP: [JG0WZ-7X009][EC 33554504] 192.168.2.20 unrecognized capability code: 76 - ignored
2026/02/02 05:39:07 BGP: [GYHDK-S2BXG] peer 192.168.2.20, EOR_required 0
2026/02/02 05:39:09 BGP: [JG0WZ-7X009][EC 33554504] 192.168.2.20 unrecognized capability code: 76 - ignored
2026/02/02 05:39:10 BGP: [GYHDK-S2BXG] peer 192.168.2.20, EOR_required 0
2026/02/02 05:39:11 BGP: [JG0WZ-7X009][EC 33554504] 192.168.2.20 unrecognized capability code: 76 -  ignored
2026/02/02 05:39:12 BGP: [GYHDK-S2BXG] peer 192.168.2.20, EOR_required 0
2026/02/02 05:39:13 BGP: [JG0WZ-7X009][EC 33554504] 192.168.2.20 unrecognized capability code: 76 - ignored
2026/02/02 05:39:14 BGP: [GYHDK-S2BXG] peer 192.168.2.20, EOR_required 0
2026/02/02 05:39:15 BGP: [JG0WZ-7X009][EC 33554504] 192.168.2.20 unrecognized capability code: 76 - ignored
2026/02/02 05:39:16 BGP: [GYHDK-S2BXG] peer 192.168.2.20, EOR_required 0

I don't know what's happening? Does anyone know? Or am I missing some components during compilation?

Version

10.5.1

How to reproduce

N/A

Expected behavior

N/A

Actual behavior

N/A

Additional context

No response

Checklist

• I have searched the open issues for this bug.
• I have not included sensitive information in this report.

[ton31337]

Where are these logs coming from? It sounds like it's not 10.5.x, but a quite old release.