peer mesh-group

Function

The peer mesh-group command adds an MSDP peer to a mesh group.

The undo peer mesh-group command restores the default configuration.

By default, an MSDP peer does not belong to any mesh group.

Format

peer peer-address mesh-group name

undo peer peer-address mesh-group

Parameters

Parameter	Description	Value
peer-address	Specifies the address of an MSDP peer that is to be a member of a mesh group.	The address is in dotted decimal notation.
name	Specifies the name of a mesh group.	The name is a string of 1 to 32 case-sensitive characters.

Views

MSDP view of the public network instance or MSDP view of the VPN instance

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

If multiple MSDP peers exist on a network, SA messages may be flooded between peers. Especially when many MSDP peers are configured in the same PIM-SM domain, RPF rules cannot filter out useless SA messages effectively. The MSDP peer needs to perform an RPF check on each SA message received, which brings a heavy load to the system.

Configuring multiple MSDP peers to join the same mesh group can reduce the number of SA messages transmitted between these MSDP peers and reduce the load on the system.

Prerequisites

The device has established MSDP peer relationships with current mesh group members using the peer connect-interface command.

Configuration Impact

One MSDP peer can join only one mesh group. If an MSDP peer is added to different mesh groups several times, the latest configuration takes effect.

When a member of the mesh group receives an SA message, it checks the source of the SA message:

If the SA message is sent by a certain MSDP peer outside the mesh group, the member performs the RPF check on the SA message. If the SA message passes the check, the member forwards it to other members of the mesh group.
If the SA message is sent by a member of the mesh group, the member directly accepts the message without performing the RPF check. In addition, it does not forward the message to other members in the mesh group.

Precautions

The MSDP peer relationships must be established between the peers in a mesh group.

Commonly, the MSDP peers in the same AS join the same mesh group and EBGP routes need be configured between inter-AS MSDP peers.

Example

# Add the MSDP peer with the address of 10.10.7.6 to the mesh group Group1

<HUAWEI> system-view
[HUAWEI] multicast routing-enable
[HUAWEI] msdp
[HUAWEI-msdp] peer 10.10.7.6 connect-interface vlanif 100 
[HUAWEI-msdp] peer 10.10.7.6 mesh-group Group1