Community discussions

 
TUNG0407
just joined
Topic Author
Posts: 20
Joined: Tue Nov 03, 2009 7:04 am

BGP CAN'T RECEIVE PREFIX

Wed Jun 14, 2017 1:49 pm

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
 
airbanduk
newbie
Posts: 45
Joined: Mon Jun 12, 2017 2:30 pm

Re: BGP CAN'T RECEIVE PREFIX

Wed Jun 14, 2017 2:53 pm

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?
 
User avatar
IPANetEngineer
Trainer
Trainer
Posts: 1053
Joined: Fri Aug 10, 2012 6:46 am
Location: Jackson, MS, USA
Contact:

Re: BGP CAN'T RECEIVE PREFIX

Wed Jun 14, 2017 4:16 pm

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
Global - MikroTik Support & Consulting - English | Francais | Español | Portuguese +1 855-645-7684
https://iparchitechs.com/services/mikro ... l-support/ mikrotiksupport@iparchitechs.com
 
TUNG0407
just joined
Topic Author
Posts: 20
Joined: Tue Nov 03, 2009 7:04 am

Re: BGP CAN'T RECEIVE PREFIX

Wed Jun 14, 2017 4:56 pm

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

Who is online

Users browsing this forum: No registered users and 4 guests