iBgp full mess

[robtos]

Hello,

Can anybody tell me the equation you use to calculate how many ibgp sessions you need to create a full mess ( with x amount of bgp peers)

Thanks for your help!

[royalblues · Accepted solution]

n*(n-1)/2

where n is the number of nodes running BGP

Since this would sometimes result in a large number of IBGP sessions you can implement RR(route reflectors) and confederations.

HTH

Narayan

[robtos]

That's it...couldn't find it, thanks

[devang_etcom]

if you have X amount of BGP Peers then you will have X(X-1)/2 session in your AS

regards

Devang

[lloyd_andrew]

The [n(n-1)]/2 is a good general calculation for full mesh. Used to be used a lot before in Frame-Relay when calculating the number of PVC's needed for full mesh.

Just my additional $.02.

-lloyd