Configuring the Maximum Number of IGMP Group Memberships on an Interface

This section describes how to configure the maximum number of IGMP entries that can be created on the interface of the multicast device connected to the user network segment. When the number of IGMP entries reaches the limit, the system does not create any new IGMP entry. If the host wants to join a new multicast group, you need to delete certain useless entries, modify the limit, or configure the host to statically join a multicast group or source/group.

Prerequisites

Before configuring the maximum number of IGMP group memberships on an interface, complete the following task:

Configuring a unicast routing protocol
Configuring Basic IGMP Functions

Procedure

Access the system view.
system-view
Configure a basic or an advanced ACL as required.
- Configure a basic ACL.
  1. Run the acl [ number ] acl-number [ vpn-instance vpn-instance-name ] command to create a basic ACL and access its view.
  2. Run the rule [ rule-id ] { deny | permit } source { source-ip-address { 0 | source-wildcard } | address-set address-set-name | any } command to configure rules for the basic ACL.
- Configure an advanced ACL.
  1. Run the acl [ number ] acl-number [ vpn-instance vpn-instance-name ] command to create an advanced ACL and access its view.
  2. Run the rule [ rule-id ] { permit | deny } protocol [ source { source-ip-address { 0 | source-wildcard } | address-set address-set-name | any } | destination { destination-ip-address { 0 | destination-wildcard } | address-set address-set-name | any } ] ^* command to configure rules for the advanced ACL.
If a basic ACL is used, run the rule command and set the source parameter to a multicast group address.

If an advanced ACL is used, run the rule command, set the source parameter to the source address of multicast packets, and set the destination parameter to a multicast group address.
Return to the system view.
quit
Access the IGMP interface view.
interface interface-type interface-number
Set the maximum number of IGMP group memberships on the interface.
igmp limit number [ except acl-number ]
- If except is not set in the command, the FW is limited by the maximum number of IGMP entries when dynamically creating the entries for all the groups or source/groups.
- If except is specified, the interface uses the specified ACL to filter received IGMP Join messages.
  If an IGMP Join message matches an ACL rule and the action is permit, the interface permits the message.
  If an IGMP Join message matches an ACL rule and the action is deny, the interface denies the message.
  If an IGMP Join message does not match any ACL rule, the interface denies the message.
  If a specified ACL does not exist or does not contain rules, the interface denies all IGMP Join messages.