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Chapter 8: BGP Configuration Guide
Configuring a BGP Peer Group
A BGP peer group is a group of neighbor routers that have the same update policies. To
configure a BGP peer group, enter the following command in Configure mode:
Configure a BGP peer group.
where:
peer-group <number-or-string>
Is a group ID, which can be a number or a character string.
type
Specifies the type of BGP group you are adding. You can specify one of the
following:
external In the classic external BGP group, full policy checking is applied to all
routing
internal An internal group operating where there is no IP-level IGP, for example
igp
autonomous-system <number>
Specifies the autonomous system of the peer group. Specify a number from 1 –
65534.
100
bgp create peer-group <number-or-string>
incoming and outgoing advertisements. The external neighbors must
be directly reachable through one of the machine's local interfaces.
An internal group which uses the routes of an interior protocol to
resolve forwarding addresses. Type Routing groups will determine the
immediate next hops for routes by using the next hop received with a
route from a peer as a forwarding address, and using this to look up an
immediate next hop in an IGP's routes. Such groups support distant
peers, but need to be informed of the IGP whose routes they are using
to determine immediate next hops. This implementation comes closest
to the IBGP implementation of other router vendors.
an SMDS network. Type Internal groups expect all peers to be directly
attached to a shared subnet so that, like external peers, the next hops
received in BGP advertisements may be used directly for forwarding.
All Internal group peers should be L2 adjacent.
An internal group operating where there is no IP-level IGP; for
example, an SMDS network.
type external|internal|igp|routing
[autonomous-system <number>]
[proto any|rip|ospf|static]
[interface <interface-name-or-ipaddr> |all]
Internet Appliance User Reference Manual
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