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New Member

Query on BGP keep alive & Hold timers

Hi all,

Simple yet would like to know..

If I setup bgp timers as 20 (keepalive) 60 (Holddown)

After how many keepalive misses the bgp peer declared to be down..? (one keep alive -20 or 3keep alives -60)..?

TIA

MS

3 REPLIES
Hall of Fame Super Bronze

Re: Query on BGP keep alive & Hold timers

After how many keepalive misses the bgp peer declared to be down

After 3 misses.

__

Edison.

New Member

Re: Query on BGP keep alive & Hold timers

Thank you Edison. I may be wrong here but from Cisco documentation...

"BGP uses certain timers to control periodic activities such as the sending of keepalive messages, and the interval after not receiving a keepalive message after which the Cisco IOS software declares a peer dead. By default, the keepalive timer is 60 seconds, and the holdtime timer is 180 seconds."

"and the interval after not receiving a keepalive message after which the Cisco IOS software declares a peer dead."

Iam kind of confused with "after not receiving a keepalive message".

Thank you

MS

Hall of Fame Super Bronze

Re: Query on BGP keep alive & Hold timers

Under normal conditions, the BGP speaking router will expect to send and receive hello/keepalive packets every 60 seconds.

However, it can miss one or two keepalive messages and the remote peer(s) can still consider the neighbor to be up.

After 3 missed keepalive messages, the peer(s) consider the neighbor to be dead hence the BGP peering is broken.

HTH,

__

Edison.

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