3Com Switch 7750 Configuration Guide Guide

Configuring Connection between MSDP Peers 445
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■ Enable BGP or MBGP on a MSDP-enabled router. You are recommended to
assign the same address for a BGP peer or MBGP peer as the MSDP peer on a
router.
■ If a router interface serves as one end of a MSDP peer and BGP peer
simultaneously, you need to configure the same IP address for both the MSDP
peer and the BGP peer.
Configuring
Connection between
MSDP Peers
An AS may contain multiple MSDP peers. To avoid SA flooding between the MSDP
peers, you can use the MSDP mesh mechanism to improve traffic. When multiple
MSDP peers are fully connected with one another, these MSDP peers form a mesh
group. When an MSDP peer in the mesh group receives SA messages from outside
the mesh group, it sends them to other members of the group. On the other
hand, a mesh group member does not perform RPF check on SA messages from
within the mesh group and does not forward the messages to other members of
the mesh group. This avoids SA message flooding since it is unnecessary to run
BGP or MBGP between MSDP peers, thus simplifying the RPF checking
mechanism.
The sessions between MSDP peers can be terminated and reactivated sessions as
required. When a session between MSDP peers is terminated, the TCP connection
is closed, and there will be no reconnection attempts. However, the configuration
information is kept.
Configuration
Prerequisites
Before configuring an MSDP peer connection, you need to configure:
■ A unicast routing protocol
Enable IP multicast routing multicast routing-enable
Required
Other multicast configurations
do not take effect until
multicast routing is enabled.
Enable MSDP function and
enter MSDP view
msdp
Required
Enable MSDP
Create an MSDP peer
connection
peer peer-address
connect-interface
interface-type
interface-number
Required
To establish an MSDP peer
connection, you must
configure the parameters on
both peers. The peers are
identified by an address pair
(the address of the interface
on the local router and the IP
address of the remote MSDP
peer).
Configure a static RPF peer
static-rpf-peer peer-address [
rp-policy ip-prefix-name ]
Optional
For an area containing only
one MSDP peer, if BGP or
MBGP does not run in this
area, you need to configure a
static RPF peer.
Table 349 Configure MSDP basic functions
Operation Command Description