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router bgp YY
no synchronization
no auto-summary
neighbor IBGP peer-group \\\\ where IBGP is the peer group name and can be kept as per you need..
neighbor IBGP remote-as YY \\\\ YY - we define what AS does the peer group belong to
neighbor IBGP update-source Loopback0 - wise to do it this way ... safe if you have a physical link faliure.
neighbor IBGP route-reflector-client \\\\ if ithe router is a RR
neighbor IBGP send-community \\\\ if there are communities.
neighbor YY.YY.1.1 peer-group IBGP |
neighbor YY.YY.2.2 peer-group IBGP |______ these all are the neighbors that belong to this peer group
neighbor YY.YY.3.3 peer-group IBGP |
neighbor YY.YY.5.5 peer-group IBGP |
I hope that is Quite Clear.
Once a peer group is created with the neighbor peer-group command, it can be configured with the neighbor commands.
Router (config) # router bgp as-number
Creating the Peer-Group
Router(config-router)# neighbor peer-group-name peer-group
Specify BGP neighbor Router
(config-router) # neighbor ip-address or peer-group-name remote-as as-number
Peer-group configuration
Router (config) # neighbor ip-address peer-group peer-group-name
