Configuring An Anycast Rp In A Pim-Sm Domain; Establishing The Configuration Task - Huawei Quidway s3700 series Configuration Manual

Quidway S3700 Series Ethernet Switches
Configuration Guide - Multicast
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Example
<Quidway> display msdp brief
MSDP Peer Brief Information
Configured
2
Peer's Address
192.168.2.1
192.168.4.2
Run the display msdp brief command. If the brief information about the remote MSDP peer
status is displayed, it means that the configuration succeeds. For example:
<Quidway> display msdp brief
MSDP Peer Brief Information
Configured
2
Peer's Address
192.168.2.1
192.168.4.2

8.4 Configuring an Anycast RP in a PIM-SM Domain

Anycast RP indicates that when multiple RPs with the same address reside in the same PIM-SM
domain and MSDP peer relationships are set up between these RPs, IP routing automatically
selects the topologically closest RP for each source and receiver. In this manner, burdens on a
single RP are released, RP backup is implemented, and the forwarding path is optimized.

8.4.1 Establishing the Configuration Task

You can configure anycast RP in the scenario where devices in a PIM-SM domain are reachable,
PIM-SM is enabled on the interfaces configured with multicast routing, and no RP is configured
in the network.
Applicable Environment
In a traditional PIM-SM domain, each multicast group can be mapped to only one RP. When
the network is overloaded or the traffic is too concentrated, many network problems are caused.
For example, the pressure of the RP is too heavy, switchs converge slowly after the RP fails,
and the multicast forwarding path is not optimal.
After anycast RPs are applied in a PIM-SM domain, the source registers with the nearest RP and
hosts sends Join messages to the nearest RP. That is, the load of a single RP is abated, the RP
backup is implemented, and the forwarding path is optimized.
The recommended configuration solutions are as follows:
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Issue 01 (2011-10-26)
Run the display msdp peer-status [ peer-address ] to check the detailed information about
the statuses of the specified remote peers that establish the MSDP peer relationships with
the local host.
Up
2
State
UP
UP
Up
2
State
UP
UP
Configure loopback interfaces on multiple switchs in the PIM-SM domain respectively,
assign the same IP address to the loopback interfaces, and advertise the IP address by using
unicast routes.
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8 MSDP Configuration
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