anycast-rp (VPN instance IPv6 PIM view)

Function

The anycast-rp command configures an anycast-rendezvous point (Anycast-RP) and displays the IPv6 Anycast-RP view or displays an existing IPv6 Anycast-RP view.

The undo anycast-rp command deletes an Anycast-RP.

By default, no Anycast-RP is configured.

Format

anycast-rp rp-address

undo anycast-rp rp-address

Parameters

Parameter	Description	Value
rp-address	Specifies an Anycast-RP address.	The value is in hexadecimal notation. This address must be a valid IPv6 unicast address

Parameter

Description

Value

rp-address

Specifies an Anycast-RP address.

The value is in hexadecimal notation. This address must be a valid IPv6 unicast address

Views

VPN instance IPv6 PIM view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
pim	write

Usage Guidelines

Usage Scenario

In a traditional Protocol Independent Multicast-Sparse Mode (PIM-SM) domain, all multicast groups map to one RP. When the network is overloaded or all traffic needs to be forwarded by only one RP, the RP may be overburdened. If the RP fails, routes are converged slowly or multicast packets are forwarded over non-optimal paths.

To resolve this issue, run the anycast-rp command to configure an Anycast-RP in the PIM-SM domain, enabling the network to automatically select a topologically closest RP for each source and receiver. This function releases burdens on RPs, implements RP backup, and optimizes the forwarding paths.

Configuration Impact

If PIM Anycast-RP is configured, after an RP receives a Register message, it checks the source address in the Register message. If the Register message is sent by the source's designated router (DR), the RP forwards the Register message to Anycast-RP peers. If the Register message is sent by an Anycast-RP peer, it does not forward the Register message. In such a manner, Anycast-RP peers can learn source and group information from each other.

Precautions

An Anycast-RP address must be the same as that of the elected RP on the current network.
In a single instance, you can configure a maximum of four Anycast-RP addresses on each device.
Either static or dynamic RPs can be used on the network. Configuring RPs on loopback interfaces is recommended. You need to configure the same RP address on the devices to be deployed with the Anycast-RP function. If dynamic RPs are used on the network, before configuring an Anycast-RP address, run the display pim ipv6 rp-info command to check the address of the RP on the current network.

Example

# Set the Anycast-RP address to 2001:db8:2::2 and enter the IPv6 Anycast-RP view.

<HUAWEI> system-view
[~HUAWEI] ip vpn-instance abc
[*HUAWEI-vpn-instance-abc] route-distinguisher 1003:1
[*HUAWEI-vpn-instance-abc] multicast ipv6 routing-enable
[*HUAWEI-vpn-instance-abc] quit
[*HUAWEI] pim-ipv6 vpn-instance abc
[*HUAWEI-pim6-abc] anycast-rp 2001:db8:2::2
[*HUAWEI-pim6-abc-anycast-rp-2001:db8:2::2]