3Com S7902E, Configuration Manual

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To do… Use the command… Remarks
Enter system view
system-view
—
Enter BGP view bgp as-number
—
Forbid session establishment with a
peer or peer group peer { group-name |
ip-address } ignore
Optional
Not forbidden by default
Configuring a Large Scale BGP Network
In a large-scale BGP network, configuration and maintenance become difficult due to large numbers of
BGP peers. To facilitate configuration in this case, you can configure peer group, community, route
reflector or confederation as needed.
Configuration Prerequisites
Peering nodes are accessible to each other at the network layer.
Configuring BGP Peer Groups
A peer group is a group of peers with the same route selection policy.
In a large scale network, many peers may use the same route selection policy. You can configure a peer
group and add these peers into this group. In this way, peers can share the same policy as the peer
group. When the policy of the group is modified, the modification also applies to peers in it, thus
simplifying configuration.
A peer group is an iBGP peer group if peers in it belong to the same AS, and is an eBGP peer group if
peers in it belong to different ASs.
Note that:
If a peer group has peers added, you cannot remove its AS number using the undo form of the
command or change its AS number.
Configure an iBGP peer group
After you create an iBGP peer group and then add a peer into it, the system creates the peer in BGP
view and specifies the local AS number for the peer.
Follow these steps to configure an iBGP peer group:
To do… Use the command… Remarks
Enter system view system-view
—
Enter BGP view bgp as-number
—
Create an iBGP peer group group group-name [ internal ] Required
Add a peer into the iBGP peer
group
peer ip-address group
group-name
Required