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Configuring Multicast Source Discovery Protocol
MSDP Configuration Task List
IPC-485
Cisco IOS IP Configuration Guide
If you specify a prefix list, the peer will be a default peer only for the prefixes in the list. You can have
multiple active default peers when you have a prefix list associated with each. When you do not have
any prefix lists, you can configure multiple default peers, but only the first one is the active default peer
as long as the router has connectivity to this peer and the peer is alive. If the first configured peer goes
down or the connectivity to this peer goes down, the second configured peer becomes the active default,
and so on.
To specify a default MSDP peer, use the following command in global configuration mode:
See the section “Default MSDP Peer” later in this chapter for a sample configuration.
Configuring an MSDP Mesh Group
An MSDP mesh group is a group of MSDP speakers that have fully meshed MSDP connectivity between
one another. Any SA messages received from a peer in a mesh group are not forwarded to other peers in
the same mesh group. Thus, you reduce SA message flooding and simplify peer-RPF flooding. The
following command is used when multiple RPs are within a domain. It is especially used to send SA
messages across a domain.
You can configure multiple mesh groups (with different names) in a single router.
To create a mesh group, use the following command in global configuration mode for each MSDP peer
in the group:
Shutting Down an MSDP Peer
If you want to configure many MSDP commands for the same peer and you do not want the peer to go
active, you can shut down the peer, configure it, and later bring it up.
You might also want to shut down an MSDP session without losing configuration information for the
peer.
When a peer is shut down, the TCP connection is terminated and not restarted.
To shut down a peer, use the following command in global configuration mode:
Command Purpose
Router(config)# ip msdp default-peer
{peer-address | peer-name} [prefix-list list]
Defines a default MSDP peer.
Command Purpose
Router(config)# ip msdp mesh-group mesh-name
{peer-address | peer-name}
Configures an MSDP mesh group and indicates that an MSDP peer
belongs to that mesh group.
Command Purpose
Router(config)# ip msdp shutdown {peer-name |
peer address}
Administratively shuts down the specified MSDP peer.