3Com S7902E, Руководство по настройке

Страница: 808 / 2621

1-39
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.
Configuring BGP Community
A BGP community is a group of destinations with the same characteristics. It has no geographical
boundaries and is independent of ASs.
You can configure a route policy to define which destinations belong to a BGP community and then
advertise the community attribute to a peer/peer group.
You can apply a route policy to filter routes advertised to/received from a peer/peer group according to
the community attribute. This way helps simplify policy configuration and management.
For how to configure a route policy, refer to Route Policy Configuration in the IP Routing Volume .
Follow these steps to configure BGP community:
To do… Use the command… Remarks
Enter system view system-view
—
Enter BGP view bgp as-number
—