BGP HELP

[Mavrick25]

Hello Everyone..

I work for an ISP in EUROPE. I'm having a problem with the BGP Peering towards another ISP as well as the iBGP peering within our AS.

Its a fantastic BGP question as it incorporates many different questions regarding the functionality of BGP and how it operates.

The problem is that I can't describe it properly through a form...

I was wondering, if there is someone.. a network professional that would like to assist me... please leave me your email address and I will forward you a visio file with the topology and current operational status so we can discuss how resolve a major issue I'm having and that I can't resole on my own.

Thanks

Mav

[Mavrick25]

Hello Nordick26,

Sorry for the late response.

I want to take the opportunity and say thank you so much for all your help.

My actvity went very well and I'm happy about this..

So is my boss.. :)

Anyways.. Thanks again for all your help..

sincerly..

[nordick26]

Happy to hear that Mav :)

Have a nice rest of the day...

i.

[Giuseppe Larosa]

Hello Mav,

it looks like that someone has used those static routes as a fix to be able to advertise your own prefixes to the internet without finding the root cause of the problem.

Being an environment including iBGP and eBGP sessions in addition to what already correctly noted by Ivo (Nordick26) you should consider the synchronization rule:

a router doesn't advertise to an eBGP peer a route learned from an iBGP peer until the same prefix (including the prefix len) is not received from an IGP that is IS-IS in your case.

So on RA and RB you may need

router bgp xx

no synchronization

in order to have the iBGP prefixes for the several /15 accepted and propagated to eBGP peers.

the suggestion to understand what happens is to use

sh ip bgp

on RA and RB this can tell you if the route is accepted or not when the static routes are missing.

Hope to help

Giuseppe