display msdp rpf-peer

Function

The display msdp rpf-peer command displays information about all RPF peers of a specific source RP address, including RPF peer selection rules and RPF route types.

Format

display msdp [ vpn-instance vpn-instance-name | all-instance ] rpf-peer original-rp original-rp-address

Parameters

Parameter	Description	Value
vpn-instance vpn-instance-name	Specifies a VPN instance. vpn-instance-name specifies the name of the VPN instance.	The value must be an existing VPN instance name.
all-instance	Displays information about all the RPF peers of a specific source's RP address in all instances. If vpn-instance or all-instance is not specified, only the public network instance is displayed.	-
original-rp original-rp-address	Displays information about all the RPF peers of a specific source's RP address. original-rp-address specifies the source's RP address.	The value is in dotted decimal notation.

Parameter

Description

Value

vpn-instance vpn-instance-name

Specifies a VPN instance. vpn-instance-name specifies the name of the VPN instance.

The value must be an existing VPN instance name.

all-instance

Displays information about all the RPF peers of a specific source's RP address in all instances.

If vpn-instance or all-instance is not specified, only the public network instance is displayed.

original-rp original-rp-address

Displays information about all the RPF peers of a specific source's RP address. original-rp-address specifies the source's RP address.

The value is in dotted decimal notation.

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

Usage Scenario

To prevent looping of SA messages between MSDP peers, MSDP peers perform RPF checks on received SA messages and drop the SA messages that do not comply with RPF rules.

The display msdp rpf-peer command is used to check whether the forwarding path of SA messages works properly. Based on the RPF peer information in the command output, you can check every hop in the forwarding path. If the forwarding path is not working properly, this command helps you locate the faulty node.

Precautions

A device does not perform RPF checks on the SA messages received from an MSDP peer in the following situations:

The address of the MSDP peer is the RP address of the source.
The MSDP peer is a static RPF peer of the device.
The MSDP peer is a unique MSDP peer of the device.
The MSDP peer has joined a full-mesh group.

Before configuring this command, ensure that MSDP peers are configured. Only the MSDP peers with Up TCP connection can become RPF peers.

Example

# Display information about RPF peers of the source RP 192.168.4.5.

<HUAWEI> display msdp rpf-peer original-rp 192.168.4.5
MSDP RPF peer information 
 MSDP RPF peer information for Original RP: 192.168.4.5
 01. RPF peer: 10.6.6.6
  RPF selection rule: Peer is IGP next hop of best route
  RPF used topology: default
  RPF route type: multicast(static)

**Table 1** Description of the **display msdp rpf-peer original-rp** command output
Item	Description
MSDP RPF peer information	information about the MSDP RPF peer.
MSDP RPF peer information for Original RP	Information about the MSDP RPF peer of a specific source's RP address.
01. RPF peer	RPF peer address.
RPF selection rule	RPF peer selection rule: Peer is IGP next hop of best route: RPF peer is a next hop of an IGP route. Peer is IGP advertiser of best route: RPF peer is a forwarder of an IGP route. Peer is in the AS-path to original RP: RPF peer is on an AS-path to the RP address of the source. Peer is BGP/MBGP next hop of best route: RPF peer is a next hop of a/an BGP/MBGP route. Peer is BGP/MBGP advertiser of best route: RPF peer is a forwarder of a/an BGP/MBGP route.
RPF used topology	RPF used topology: default: default topology. multicast: multicast topology. topology name (user-defined): unicast topology.
RPF route type	RPF route type: mbgp: MBGP route. unicast(bgp): BGP route multicast(static): static multicast route. unicast: IGP route (unicast route).