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osrg / gobgp

BGP implemented in the Go Programming Language
https://osrg.github.io/gobgp/
Apache License 2.0
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iBGP sessions down with "accepted conn is closed to avoid be blocked" #2336

Open bakulkhanna opened 3 years ago

bakulkhanna commented 3 years ago

In a goBGP instance (version 2.10.0 ) running in our network, a few iBGP sessions went down and stayed down. This was noticed after a week of the sessions being down. This goBGP instance has 11 iBGP sessions with a peer, and 8 of those 11 sessions went down and stayed down. The goBGP daemon had to be restarted to bring all iBGP sessions back up.

I saw the following log message being logged periodically by goBGP for the 8 down sessions – while they were down: Nov 5 18:05:01 gc-rm-res-01-alpha.nae02.spprod.viasat.io bgpd[17195]: {"Key":"10.95.236.96","Topic":"Peer","level":"warning","msg":"accepted conn is closed to avoid be blocked","time":"2020-11-05T18:05:01Z"}

A restart of the goBGP instance fixed this issue and allowed all 11 iBGP sessions to come back up again. Questions:

  1. What would have caused 8 of 11 iBGP sessions at one goBGP instance to go down and stay down?
  2. What are some good practices to not have this problem happen again?

Thanks.

fikimbing commented 2 years ago

have any solutions？