BGP route refresh

[mohammedmahmoud]

Hi all,

What exactly is the difference between "clear ip bgp *" and "clear ip bgp * soft" ?

What is meant by "full BGP update is sent after issuing the clear command" ?

Do i have to issue the "clear ip bgp * soft" command on all my routers after i make a change ? (since it is applied on a per-neighbor basis as stated in the cisco press BCSI)

best regards and thanks in advance.

[Harold Ritter · Accepted solution]

"clear ip bgp *" resets the TCP session for all neighbours, whereas "clear ip bgp *" will send a route-refresh request to all neighbours for which the route refresh capability has been succesfully negotiated.

The BGP route refresh technique is described in RFC2918.

http://www.ietf.org/rfc/rfc2918.txt?number=2918

The full bgp updates will be sent to a neighbour upon reception of a route refresh message.

You would normally used the "clear ip bgp * soft" command only on the router where the routing policy has been changed.

Let me know if I have answered all of your questions,

[mohammedmahmoud]

i think that you have perfectly answered my question

thanks alot for your quick and smooth reply.