Configuring Intra-AS MSDP Peers
When multiple PIM-SM domains exist in an AS or multiple Rendezvous Points (RPs) serving different multicast groups exist in a PIM-SM domain, you are recommended to configure MSDP peer relationships between all RPs (including static RPs and Candidate-RPs (C-RPs)) and add all MSDP peers to a mesh group.
Prerequisites
Before configuring intra-AS MSDP peers, complete the following tasks:
Configuring a unicast routing protocol to enable interworking at the network layer
Enabling IP multicast
Configuring a PIM-SM domain to implement intra-domain multicast
Context
When a large multicast network is divided into multiple PIM-SM domains, MSDP is used to connect Rendezvous Points (RPs) of various domains to share the source information. In this manner, hosts in a domain can receive multicast data sent by multicast sources in other domains.
To ensure that all RPs in the network can share the source information, reduce the scale of an MSDP connected graph. It is recommended that you configure MSDP peer relationships between all RPs, including static RPs and Candidate-RPs (C-RPs), in the network.
Procedure
- Access the system view.
- Enable MSDP in the public network instance or VPN instances
and access the MSDP view.
msdp [ vpn-instance vpn-instance-name ]
- Configure an MSDP peer connection.
peer peer-address connect-interface interface-type interface-number
The parameters of the command are explained as follows:
peer-address: specifies the address of a remote MSDP peer.
interface-type interface-number: specifies the local interface connected to the remote MSDP peer.
The system does not advertise routes on MTIs to VPNs; therefore, it is not allowed to use MTIs to set up an MSDP peer connection.
- (Optional) Add description of a remote MSDP peer.
peer peer-address description text
This configuration helps to differentiate remote MSDP peers and manage the connections with the remote MSDP peers.
The parameters of the command are explained as follows:
peer-address specifies the address of a remote MSDP peer.
text: specifies the description text. The text is a string of 80 characters.
- Configure a remote MSDP peer to join a mesh group.
peer peer-address mesh-group name
That is, the remote MSDP peer is acknowledged as a member of the mesh group.
The parameters of this command are explained as follows:
peer-address: specifies the address of a remote MSDP peer.
name: specifies the name of a mesh group. The members of the same mesh group use the same mesh group name.
Note the following:
MSDP peer connections must be set up between all members of the same mesh group.
All members of the mesh group must acknowledge each other as a member of the group.
An MSDP peer can belong to only one mesh group. If an MSDP peer is configured to join different mesh groups for multiple times, only the latest configuration is valid.