BGP flapping between routers

[palani2010]

BGP Flapping between routers not issue seen between router. How to troubleshoot further.

[MHM Cisco World]

the first think you must looking for is 
MTU mismatch between two peer

MHM

[MHM Cisco World]

https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/116377-troubleshoot-bgp-mtu.html

check this link

MHM

[paul driver]

Hello
Can you elaborate on your issue and topology please?
Do you mean the bgp peering is flapping or routes?
How are the rtrs connected - directly or via a l2 handoff switch/firewall?
What type of peering is this -  ebgp/ibgp?
Are you using any igp as a underlay transit?

[palani2010]

Both routers are directly connected.

Types of BGP - EBGP

[paul driver]

Hello
So how are they peering - physical or logical interfaces (loopbacks) 
Do  see any interface errors
Are you using default static routes 
Is reachabilty to the peering addresses okay