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NE40E V800R010C10SPC500 Configuration Guide - IP Multicast 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Multicast
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Configuring IGMP Prompt-Leave

Configuring IGMP Prompt-Leave

Usage Scenario

By default, IGMP-enabled interfaces send last-member query messages after receiving Leave messages for a specific multicast group from hosts. If the IGMP prompt leave function is enabled, the interfaces directly delete the records of the multicast group without sending last-member query messages. This feature shortens the delay in responding to Leave requests and reduces network bandwidth consumption. Currently, prompt-leave is available only in IGMPv2.

Pre-configuration Tasks

Before configuring prompt-leave, complete the following tasks:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Configure a basic or an advanced ACL as needed.

    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 and set the destination parameter to a multicast group address.

    • Configure a basic ACL.

      1. Run acl [ number ] basic-acl-number [ match-order { auto | config } ]

        A basic ACL is created, and the basic 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 ACL.

    • Configure an advanced ACL.

      1. Run acl { name advance-acl-name [ advance | [ advance ] number advance-acl-number ] | [ number ] advance-acl-number } [ match-order { config | auto } ]

        An advanced ACL is created, and the advanced ACL view is displayed.

      2. Run rule [ rule-id ] [ name rule-name ] { deny | permit } ip [ destination { destination-ip-address { destination-wildcard | 0 } | any } | source { source-ip-address { source-wildcard | 0 } | any } ] *

        Rules are configured for the advanced ACL.

  3. Run quit

    Return to the system view.

  4. Run interface interface-type interface-number

    The interface view is displayed.

  5. Run igmp prompt-leave [ group-policy { acl-number | acl-name acl-name } ]

    The IGMP prompt leave function is configured on the interface.

    In an ADSL dial-up access, the IGMP querier corresponds to only one host because one host corresponds to one port. When a receiver frequently joins or leaves multiple multicast groups, enable the prompt leave function on the querier.

    NOTE:
    • If group-policy is not specified, the interface implements prompt-leave for all Leave requests.
    • If group-policy is specified and a multicast group matches the permit action, the interface implements prompt-leave for Leave requests of this group.
    • If group-policy is specified and a multicast group matches the deny action, the interface does not implement prompt-leave for Leave requests of this group.
    • If group-policy is specified and a multicast group does not match any ACL rule, the interface does not implement prompt-leave for Leave requests of this group.
    • If the ACL specified in group-policy does not exist or no rules are configured in the ACL, the interface does not implement prompt-leave for any Leave requests.

  6. Run commit

    The configuration is committed.

Checking the Configurations

Run the display igmp [ vpn-instance vpn-instance-name | all-instance ] interface [ interface-type interface-number | up | down ] [ verbose ] command to check the configurations and operating status of IGMP on an interface.

# Run the display igmp interface verbose command to view detailed IGMP configurations of interfaces. The command output shows that IGMP prompt-leave is enabled on GE 3/0/1.

<HUAWEI> display igmp interface verbose
Interface information of VPN-Instance: public net
 Gigabitethernet3/0/1(192.168.101.1):
   IGMP is enabled
   Current IGMP version is 2
   IGMP state: up
   IGMP group policy: none
   IGMP limit: -
   IGMP access-limit: 5  except: 2002
   Value of query interval for IGMP (negotiated): -
   Value of query interval for IGMP (configured): 60 s
   Value of other querier timeout for IGMP: 0 s
   Value of maximum query response time for IGMP: 10 s
   Value of last member query time: 2 s
   Value of last member query interval: 1 s
   Value of startup query interval: 15 s
   Value of startup query count: 2
   General query timer expiry (hours:minutes:seconds): 00:00:44
   Querier for IGMP: 192.168.101.1 (this router)
   IGMP activity: 4 joins, 0 leaves
   Robustness (negotiated): -
   Robustness (configured): 2
   Require-router-alert: disabled
   Send-router-alert: enabled
   Ip-source-policy: ab
   Query ip-source-policy: 2000
   Prompt-leave: enabled
   SSM-Mapping: enabled
   Startup-query-timer-expiry: off
   Other-querier-present-timer-expiry: off
   IGMP ipsec: enabled(sa-name: sa1)
  Total 2 IGMP Groups reported 
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Updated: 2019-01-03

Document ID: EDOC1100055017

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