Setting an SSM Group Address Range

Protocol Independent Multicast-Source-Specific Multicast (PIM-SSM) and PIM-SM have different group address ranges. If the group that a host joins is in the SSM group address range, PIM-SSM is adopted for multicast data forwarding; otherwise, PIM-SM is adopted. The default SSM group address range is 232.0.0.0/8, and the SSM group address range can be modified.

Context

Ensure that the SSM group address ranges of all routers are the same. Otherwise, faults may occur.

Procedure

Run system-view
The system view is displayed.
Configure a basic numbered ACL or a named ACL as needed.
- Configure a basic numbered ACL.
  1. Run acl [ number ] basic-acl-number [ match-order { auto | config } ]
    A basic numbered ACL is created, and the basic numbered ACL view is displayed.
  2. Run rule [ rule-id ] [ name rule-name ] { deny | permit } source { source-ip-address { source-wildcard | 0 } | any }
    Rules are configured for the basic numbered ACL.
- Configure a named ACL.
  1. Run aclname acl-name basic [ match-order { auto | config } ]
    A named ACL is created, and the named ACL view is displayed.
  2. Run rule [ rule-id ] [ name rule-name ] { deny | permit } source { source-ip-address { source-wildcard | 0 } | any }
    Rules are configured for the named ACL.
Run quit
Return to the system view.
Run pim [ vpn-instancevpn-instance-name ]
The PIM view is displayed.
Run ssm-policy { basic-acl-number | acl-name acl-name }
An SSM group address range is configured.
- If a group address matches an ACL rule and the action is permit, the device determines that this group is in the SSM group address range.
- If a group address matches an ACL rule and the action is deny, the device determines that this group is not in the SSM group address range.
- If a group address does not match any ACL rule, the device determines that this group is not in the SSM group address range.
- If a specified ACL does not exist or does not contain rules, the device determines that no groups are in the SSM group address range.
Run commit
The configuration is committed.