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Published 20 hours ago • verified publisher icon FRRouting

BGP Route not Restored on Node B after Reconnecting Intermediate Link with BFD

Open lijinxianglogo opened this issue 1 year ago • 8 comments

  1. Topology consists of Node A - Node B - Node C.
  2. EBGP established between Node A and Node C. BFD is enabled between A and C, allowing successful route learning between them.
  3. Node B's network is intentionally brought down, causing rapid convergence and successful route restoration between Node A and Node C.
  4. Node B's network is reconnected.
  5. Node A's route to Node B is successfully restored, but Node B fails to restore its route to Node A However, performing the same steps without utilizing the BFD feature allows for successful restoration of routes between Node A and Node C. node A info 企业微信截图_16920735743244 企业微信截图_16920713998486 企业微信截图_16920714896299 企业微信截图_16920715556995 企业微信截图_16920715785032 node C info 企业微信截图_1692073595158 企业微信截图_1692071434694 企业微信截图_16920715188908 企业微信截图_16920715381306 企业微信截图_16920715991212

lijinxianglogo avatar Aug 15 '23 04:08 lijinxianglogo

I see that this was tested with FRR 8.2.2 - Any chance to retest this with a newer FRR? 9.0 just came out or at least some 8.5.x release.

mwinter-osr avatar Aug 15 '23 13:08 mwinter-osr

I see that this was tested with FRR 8.2.2 - Any chance to retest this with a newer FRR? 9.0 just came out or at least some 8.5.x release.

Thanks for the reply, I'll test version 9.0

lijinxianglogo avatar Aug 16 '23 01:08 lijinxianglogo

I see that this was tested with FRR 8.2.2 - Any chance to retest this with a newer FRR? 9.0 just came out or at least some 8.5.x release.

I upgraded to version 9.0 and found that this problem is indeed no longer present but I have a question, in version 8.2.2, I can solve this issue by using disable-connected-check configuration. So, is the root cause of this issue due to the execution of connected-check?

lijinxianglogo avatar Aug 16 '23 10:08 lijinxianglogo

Could you show also the BFD configuration?

ton31337 avatar Aug 18 '23 09:08 ton31337

Could you show also the BFD configuration?

image image

lijinxianglogo avatar Aug 18 '23 09:08 lijinxianglogo

Could you show also the BFD configuration?

I upgraded to version 9.0 and found that this problem is indeed no longer present but I have a question, in version 8.2.2, I can solve this issue by using disable-connected-check configuration. So, is the root cause of this issue due to the execution of connected-check?

lijinxianglogo avatar Aug 18 '23 09:08 lijinxianglogo

This issue is stale because it has been open 180 days with no activity. Comment or remove the autoclose label in order to avoid having this issue closed.

github-actions[bot] avatar Feb 15 '24 01:02 github-actions[bot]

This issue will be automatically closed in the specified period unless there is further activity.

frrbot[bot] avatar Feb 15 '24 01:02 frrbot[bot]