Peer group consept

oxzgan

I read tht peer groups can either used in ibgp peers or ebgp peers.
My doubt is if i use peer group in ibgp ( same as ) do i need to have direct ibgp peers among one another ( all ibgp peers ) and cant use Route refelctor.
in simple words if we use Route refelctor some ibgp members wont have direct connection , routes will refect from RR( route reflector ) to other peers.So can i use peer group configuration , while use RR,

on my searches i saw if we disable #bgp client-to-client refelction we can use peer group . can any body share their ideas?

Ryan82

I believe I understand what you are asking.

So you can apply a peer group to your neighbors as needed. For instance you could apply something like this on your RR for each of your clients:

neighbor IBGP_RR_CLIENTS peer-group
neighbor IBGP_RR_CLIENTS update-source lo0
neighbor IBGP_RR_CLIENTS route-reflector-client
neighbor IBGP_RR_CLIENTS remote-as 10

Then

neighbor 2.2.2.2 peer-group IBGP_RR_CLIENTS
neighbor 3.3.3.3 peer-group IBGP_RR_CLIENTS

The use of peer groups does not necessitate a full mesh amongst the ibgp peers whether they are directly connected or not. The same rules apply as before. You either need to have a full ibgp mesh or make use of RR's.

If you had some peers that had some different characteristics, you could either create another peer-group to use for those neighbors, use the original peer-group but manually define the changes at the neighbor level (such as the only change needing to be update-source lo1) which will override what is defined at the peer group level, or not use a peer-group at all for that neighbor.

I hope I explained this clearly and this is what you are looking for