Cisco Systems 78-11741-02 Configuring an Msdp Mesh Group, Shutting Down an Msdp Peer, IPC-485

Configuring Multicast Source Discovery Protocol

MSDP Configuration Task List

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:

Command	Purpose
Router(config)# ip msdp default-peer	Defines a default MSDP peer.
{peer-address peer-name}[prefix-listlist]

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:

Command	Purpose
Router(config)# ip msdp mesh-group mesh-name	Configures an MSDP mesh group and indicates that an MSDP peer
{peer-address peer-name}	belongs to that mesh 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 shutdown {peer-name	Administratively shuts down the specified MSDP peer.
peer address}

Cisco IOS IP Configuration Guide

IPC-485