H3C Technologies H3C S7500E Series Switches - Manual (Page 244)

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To do… Use the command… Remarks
Add the peer into the group
peer ip-address group
group-name [ as-number
as-number ]
Required
The AS number can be either
specified or not specified in the
command. If specified, the AS
number must be the same as that
specified for the peer with the peer
ip-address as-number as-number
command.
Peers added in the group can have different AS numbers.
Follow these steps to configure an eBGP peer group using the third approach:
To do… Use the command… Remarks
Enter system view system-view —
Enter BGP view bgp as-number —
Create an eBGP peer group group group-name external Required
Add a peer into the group and
specify its AS number
peer ip-address group
group-name as-number
as-number
Required
z Do not specify any AS number for a peer before adding it into the peer group.
z Peers added in the group can have different AS numbers.
Configuring BGP community can also help simplify routing policy management, and a community has
a much larger management scope than a peer group by controlling routing policies of multiple BGP
routers.
To guarantee the connectivity between iBGP peers, you need to make them fully meshed. But it
becomes unpractical when there are large numbers of iBGP peers. Configuring route reflectors or
confederation can solve it. In a large-scale AS, both of them can be used.