I have a question related to peer group, As the basic advantage of "peer group" is used to reduce the amount of system resources (CPU and Memory) in an update. and it also simplifies the router cofiguration.
with the above concept, here is the configuration
router BGP 10
neighbour 10.1.1.1 remote-as 20
neighbour 10.1.2.1 remote-as 30
neighbour 10.1.3.1 remote-as 40
neighbour 10.1.4.1 remote-as 10
neighbour 10.1.4.1 route-reflector-client
neighbour 10.1.4.2 remote-as 10
neighbour 10.1.4.2 route-reflector-client
with the above configuration, it is clear to use one peer group for route-reflector clients, But is it better to use peer group for the external peers with the context of above configuration.
You should use BGP peer groups when you have many BGP peers which share almost the same configuration.
Your peer-group will have the directives which apply to all eBGP peers (stuff like non-default timers if applicable, maximum received route threshold, outbound distribute list to make sure you only send your -own- announcements out, etc.)
Don't be afraid of using multiple peer-groups either! You can have one peer-group for the route-reflector setup, one peer-group for eBGP "customer" sessions, one for "transit" sessions, one for "peering" sessions.
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