Hi All,
Hopefully someone can shed some light on this problem for me. I’m lost for what to do.
We have 4 routers, 3 running .51, one running .27
If router 4 disconnects from router 3, then reconnects (wirelessly) the BGP peer on 4 will fail to establish, and the peers / instance on router 3 disapeer both under winbox & terminal. After 2-3 minutes you will see the peers on router 3 flash on and off, and then the router will reboot, and 9 times out of 10, BGP is back. The problem is, this continues down the routers right to router 1, due to router 3’s peers ‘disapeering’
Has anyone seen this before? Any idea what might be going on?
.27 is very BGP buggy. .26 was the last version somewhat decent until about the .43s or .45s… .27 was very bad in my memory. best bet is to upgrade all to .51 and see what happens. If there is still a problem then give us more detail.
Sam
Well the issue will happen for me between two .51 routers even if we dont include the .27
What more detail would you like?
any route filters in place ?
are you exchanging default routes?
are you exchange routes that would cause a loop when learned ?
We have filters in place to discard the default routes
From #4
2 chain=Tower6-Out prefix=0.0.0.0/0 invert-match=no action=discard
3 chain=Tower63-In prefix=0.0.0.0/0 invert-match=no action=discard
From #3
2 chain=Tower3-Out prefix=0.0.0.0/0 routing-mark=WP invert-match=no
action=discard
I wouldnt know how to check if we are exchanging routes that would cause a loop
you can setup a routing filter to disable all the incoming routes. This will allow them to come in but be disabled / invalid. Then you can review and see if there are routes that look like they would cause a problem. Most peoples problems with BGP end up being routes exchanged that cause the peer to now be on another path and then its not reachable anymore / or a loop.
Sam
Ok, but i still dont know how to proceed from here. How do i check these things?
Hi Guys
We are still having these problems. Any help would be appreciated