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BGP CAN'T RECEIVE PREFIX
Posted: Wed Jun 14, 2017 1:49 pm
by TUNG0407
Dear ALL,
We have two ccr1009(Version 6.37.1) and running iBGP a year normally, but today we found the BGP session is established
, RouterA can receive the prefix from Router B, but Router B can’t receive the prefix from Router A.
Anyone can help to troubleshoot the problem?
TungHo
Re: BGP CAN'T RECEIVE PREFIX
Posted: Wed Jun 14, 2017 2:53 pm
by airbanduk
Do you have any filters applied? If yes, check what is being advertised to router B from A against the filter.
Are the prefixes from router A locally generated or are they learned from some other router? If they are learned from another iBGP router they wont be forwarded unless they are reflected.
There are a number of reasons why prefixes wouldn't be advertised, can you provide any more info?
Re: BGP CAN'T RECEIVE PREFIX
Posted: Wed Jun 14, 2017 4:16 pm
by StubArea51
Has any of your configuration changed?
If not, i'd disable and re-enable the peering and then upgrade to the latest bugfix version of ROuterOS
Re: BGP CAN'T RECEIVE PREFIX
Posted: Wed Jun 14, 2017 4:56 pm
by TUNG0407
Has any of your configuration changed?
TungHo: No, haven't change the setting over a year.
If not, i'd disable and re-enable the peering and then upgrade to the latest bugfix version of ROuterOS
tungHo: i have try to disable and re-enable the peer at that moment, but still can't receive the prefix from Router A. I just updated the version to v6.39.2, hope can fix the problem.
TungHo