ssm-policy(IPv6 PIM view)

Function

The ssm-policy command sets the range of IPv6 Source-Specific Multicast (SSM) group addresses.

The undo ssm-policy command restores the default value.

By default,the range of IPv6 SSM group addresses is FF3x::/32. (The value of x cannot be 1 or 2.)

Format

ssm-policy { basic-acl6-number | acl6-name acl6-name }

undo ssm-policy

Parameters

Parameter	Description	Value
basic-acl6-number	Specifies the number of a basic IPv6 ACL. This ACL defines the range of IPv6 SSM group addresses.	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).

Parameter

Description

Value

basic-acl6-number

Specifies the number of a basic IPv6 ACL. This ACL defines the range of IPv6 SSM group addresses.

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).

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

After the ssm-policy command is configured on a device, all PIM-SM interfaces on the device consider that multicast groups whose addresses are within the SSM group address range adopt the PIM-SSM model.

The SSM group address range can be out of FF3x::/32. The groups that are not in the SSM group address range all adopt the Any-Source Multicast (ASM) model.

The SSM model is triggered in the following situations:

Multicast group addresses are in the SSM group address range, Multicast Listener Discovery version 2 (MLDv2) is run on the user network segment, and multicast source addresses are specified in Report messages.
Multicast group addresses are in the SSM group address range, MLDv1 is run on the user network segment, and SSM mapping is configured on the Router connected with user hosts.

Prerequisites

The multicast ipv6 routing-enable command is run in the public network instance view.

Relevant ACL rules have been defined.

Configuration Impact

If the ssm-policy command is run several times, the latest configuration overrides the previous one.

Example

# Create a named IPv6 ACL, setting the range of SSM group addresses to FF31:0:8192::/96.

<HUAWEI> system-view
[~HUAWEI] acl ipv6 name myacl6 basic
[*HUAWEI-acl6-basic-myacl6] rule permit source ff31:0:8192:: 96
[*HUAWEI-acl6-basic-myacl6] quit
[*HUAWEI] multicast ipv6 routing-enable
[*HUAWEI] pim-ipv6
[*HUAWEI-pim6] ssm-policy acl6-name myacl6

# Set the range of SSM group addresses to FF31:0:8192::/96 in an SSM policy.

<HUAWEI> system-view
[~HUAWEI] acl ipv6 2000
[*HUAWEI-acl6-basic-2000] rule permit source ff31:0:8192:: 96
[*HUAWEI-acl6-basic-2000] quit
[*HUAWEI] multicast ipv6 routing-enable
[*HUAWEI] pim-ipv6
[*HUAWEI-pim6] ssm-policy 2000