BGP

[M.Sultan]

Hello guys

What parameters should match and what parameters shouldn't match between BGP peers for a successful BGP implementation?

What is the important thing in BGP ?

Also Please Explain what is BGP Flapping ?

Thank you

[David Ruess]

Hello,

To answer your questions in order:

1. https://www.ciscopress.com/articles/article.asp?p=2756480&seqNum=4#:~:text=BGP%20Versions%20must%20match.,(RID)%20must%20be%20unique.

2. BGP is a complicated protocol and for good reason. Its the routing protocol of the internet. Everything is important to understand BGP fully.

3. BGP flapping is when the neighbors doesn't have a stable connection or a possible misconfig and the neighborship flaps.

Hope that helps

-David

[Martin L]

TCP reach-ability is the most important thing in BGP.  BGP is somewhere between application that uses TCP to reach and exchange routes and protocol that BGP follows and protocols have stick rules.

Regards, ML
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[paul driver]

Hello
for a successful bgp peering, you need to have:

• Layer 2 connectivity Layer 3 reachability to neighbor ( not via a default route - test via ping)
• Correct multi-hop value (non directly connected ebgp peers) 
• Correct source interface (non directly connected ebgp peers)
• BGP protocol allowed (port 179 - when using access-list/firewalls)