3Com Switch 8800 Family Configuration Guide

Configuring BGP 369
This configuration can be applied to IBGP peer groups only.
By default, all IBGP peers in the autonomous system must be fully connected.
Moreover, neighbors do not notify the learned IBGP routes.
Configuring to send default route to a peer group
If you only need to notify a default route between a pair of BGP peer instead of
transmitting the default route within the whole network, you can use the peer
default-route-advertise command.
Perform the following configuration in BGP view.
By default, a BGP speaker does not send default route to any peer group.
After you use the peer default-route-advertise command, the local router will
send a default route with the next hop as itself to the peer unconditionally, even if
there is no default route in BGP routing table.
Configuring itself as the next hop when advertising routes
In general, when sending routes to the EBGP peer, the BGP speaker will set the
next hop address of the routing information as the local address. When sending
routes to the IBGP peer, the BGP speaker will not modify the next hop address.
In some networking conditions, when the routes are sent to the IBGP peer, you
can configure the local address of the sender as the next hop, consequently
ensuring the IBGP neighbors can find the correct next hop.
Perform the following configuration in BGP view.
Removing private AS numbers while transmitting BGP update messages
Generally, the AS numbers (public AS numbers or private AS numbers) are
included in the AS paths while transmitting BGP update messages. This command
Cancel the configuration of making the peer
group as the client of the BGP route reflector
undo peer group-name reflect-client
Tab le 358 Configure to send default route to a peer group
Operation Command
Configure to send default route to a peer
group
peer group-name default-route-advertise
Configure not to send default route to a peer
group
undo peer group-name
default-route-advertise
Tab le 359 Configure itself as the next hop when advertising routes
Operation Command
Configure itself as the next hop when
advertising routes
peer group-name next-hop-local
Disable the specification of itself as the next
hop when advertising routes
undo peer group-name next-hop-local
Table 357 Configure an IGMP peer group to be a client of a route reflector
Operation Command