ssm-policy

Function

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

The undo ssm-policy command restores the default configuration.

By default, the range of SSM group addresses is 232.0.0.0/8.

Format

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

undo ssm-policy

Parameters

Parameter	Description	Value
basic-acl-number	Specifies the number of the basic ACL that defines the range of SSM group addresses.	The value ranges from 2000 to 2999.
acl-name acl-name	Specifies the name of a named basic 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-acl-number

Specifies the number of the basic ACL that defines the range of SSM group addresses.

The value ranges from 2000 to 2999.

acl-name acl-name

Specifies the name of a named basic 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

VPN instance PIM view, PIM view of a public network instance

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
pim	write

Usage Guidelines

Usage Scenario

You can run the ssm-policy command to specify the range of SSM group addresses. All interfaces on which PIM-SM is enabled consider that multicast groups that belong to the address range are in SSM mode.

The range of SSM group addresses can exceed 232.0.0.0/8. Any-Source Multicast (ASM) is applicable to all multicast groups that are not in the range of SSM group addresses.

The conditions for enabling SSM mode are as follows:

The address of the multicast group is in the range of SSM group addresses, the network segment where the host resides runs IGMPv3, and the source address is specified in the Report message.
The address of the multicast group is in the range of SSM group addresses, the network segment where the host resides runs IGMPv1 or IGMPv2, and the Router is configured with SSM mapping.

Prerequisites

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

Related ACL rules have been defined.

Configuration Impact

If the ssm-policy command is run more than once, the latest configuration overrides the previous one.

Precautions

The ssm-policy command and the acl command are used together. In the ACL view, you can set the address range of SSM multicast groups by specifying the source parameter in the rule command.

Example

# In the public network instance, set the range of PIM SSM multicast addresses to 232.1.0.0/16 by using a numbered ACL.

<HUAWEI> system-view
[~HUAWEI] acl number 2000
[*HUAWEI-acl4-basic-2000] rule permit source 232.1.0.0 0.0.255.255
[*HUAWEI-acl4-basic-2000] quit
[*HUAWEI] multicast routing-enable
[*HUAWEI] pim
[*HUAWEI-pim] ssm-policy 2000

# In the public network instance, set the range of PIM SSM multicast addresses to 232.1.0.0/16 by using a named ACL.

<HUAWEI> system-view
[~HUAWEI] acl name myacl basic
[*HUAWEI-acl4-basic-myacl] rule permit source 232.1.0.0 0.0.255.255
[*HUAWEI-acl4-basic-myacl] quit
[*HUAWEI] multicast routing-enable
[*HUAWEI] pim
[*HUAWEI-pim] ssm-policy acl-name myacl