c-rp (IPv6)

Function

The c-rp command configures a candidate-rendezvous point (C-RP) on a Router, so that the Router can announce itself as a C-RP to the bootstrap router (BSR).

The undo c-rp command deletes a C-RP.

By default, no C-RP is configured.

Format

c-rp ipv6-address [ group-policy { basic-acl6-number | acl6-name acl6-name } | priority priority | holdtime hold-interval | advertisement-interval adv-interval ] ^*

undo c-rp ipv6-address

Parameters

Parameter	Description	Value
ipv6-address	Specifies a IPv6 address.	The value is a 128-digit hexadecimal number in the format of X:X::X:X.
group-policy basic-acl6-number	Specifies the range of multicast groups that a C-RP serves. You can define the range of multicast groups by creating an IPv6 ACL. groupPolicyNum specifies the number of a basic IPv6 ACL.	The value is an integer ranging from 2000 to 2999.
acl6-name acl6-name	Specifies the name of a named basic IPv6 ACL.	The value is a string of 1 to 64 case-sensitive characters without spaces. The value must start with a letter (a to z or A to Z, case sensitive).
priority priority	Specifies a priority value for a C-RP. A larger value indicates a lower C-RP priority.	The value is an integer ranging from 0 to 255. The default value is 192.
holdtime hold-interval	Specifies a timeout period during which a BSR waits to receive an Advertisement message from a C-RP.	The value is an integer ranging from 1 to 65535, in seconds. The default value is 150.
advertisement-interval adv-interval	Specifies an interval at which a C-RP sends Advertisement messages.	The value is an integer ranging from 1 to 65535, in seconds. The default value is 60.

Views

IPv6 PIM view, VPN instance IPv6 PIM view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
pim	write

Usage Guidelines

Usage Scenario

An RP is the core of a PIM-SM domain, and thus a C-RP must be able to communicate with the other devices in the PIM-SM domain. Configuring a C-RP on the Router on the backbone network and reserving enough bandwidth between the Router and each of the other devices in the PIM-SM domain are recommended.

An RP is elected from C-RPs based on the following rules:

The C-RP wins if it serves the group address that users join has the longest mask.
If group addresses that users join and are served by C-RPs have the same mask length, the priorities of the C-RPs are compared. The C-RP with the highest priority wins (a larger priority value indicates a lower priority).
In case of the same priority, hash functions are operated. The C-RP that has the greatest calculated value wins.
If all the preceding factors are the same, the C-RP that has the highest address wins.

Prerequisites

The IPv6 PIM view has been displayed using the pim-ipv6 command.
IPv6 PIM-SM has been enabled on the interface on which a C-RP is to be configured.
If groupPolicyNum is specified in the c-rp command, ensure that the corresponding ACL6 rule has been configured.

Configuration Impact

If the c-rp command is run more than once, the latest configuration overrides the previous one.As an interface is specified in the c-rp command, the values of group-policy, priority, holdtime, and advertisement-interval specified in this command override the values of the global parameters inherited by the interface from the PIM view. If this command is run on the same interface more than once, the latest configuration overrides the previous one.

Precautions

groupPolicyNum specifies a group range. All permitted group ranges will be advertised as the ranges of groups that the RP serves. If no group range is specified for a C-RP or a C-RP is configured to serve all addresses, the C-RP serves all multicast groups.

If the router functioning as a C-RP is required to serve multiple group address ranges, configure multiple rules for an IPv6 ACL used by a group policy, with a group address range defined in each rule.

Example

# In the public network instance, configure GE 0/1/0 with the IPv6 address of 2001::1 as the C-RP of PIM-SM domain ff02:0:1391::/96, set the priority of the C-RP to 10, and create basic ACL 2069 for the group policy of the C-RP.

<HUAWEI> system-view
[~HUAWEI] multicast ipv6 routing-enable
[*HUAWEI] acl ipv6 2069
[*HUAWEI-acl6-basic-2069] rule permit source ff02:0:1391:: 96
[*HUAWEI-acl6-basic-2069] quit
[*HUAWEI] pim-ipv6
[*HUAWEI-pim6] c-rp 2001::1 group-policy 2069 priority 10