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Configuration Guide - IP Multicast

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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Configuring IGMP Querier Parameters

Configuring IGMP Querier Parameters

Context

IGMP maintains group memberships using Query and Report messages. When multiple multicast switches exist on a network segment, an IGMP querier is elected among them to send IGMP Query messages. The IGMP querier can work normally using default settings of querier parameters. You can modify the querier parameters to enable the querier to update group membership in a timely manner and avoid network congestion.

Table 2-11 lists description and default setting of IGMP querier parameters.

Table 2-11 Description and Default setting of IGMP querier parameters

Parameter

Description

Default Setting

General query interval

This parameter specifies the interval for sending IGMP General Query messages. The querier sends IGMP General Query messages at specified intervals to maintain group memberships of interfaces.

60s

Robustness variable of the IGMP querier

This parameter specifies the retransmission count of IGMP packets to minimize the impact of packet loss on the network.

The robustness variable defines the following values:
  • Number of times the querier sends General Query messages after startup.
  • Number of times the querier sends Multicast Address Specific Query messages or Multicast Address and Source Specific Query messages after receiving a Done message.

2

Maximum response time for IGMP General Query messages

After a multicast member receives an IGMP General Query message, it must send a Report message to the IGMP querier within the maximum response time.

10s

Other querier present interval

If non-querier routers do not receive any Query message within this interval, they consider the querier invalid and trigger election of a new querier.

125s if the robustness variable, interval for sending IGMP General Query messages, and maximum response time are all default values

Group-specific or group-and-source-specific query interval

This parameter specifies the interval for sending Group-Specific or Group-and-Source-Specific query messages. When the querier receives a Leave message for a group, it sends Group-Specific or Group-and-Source-Specific query messages at specified intervals to check for other members in the group.

1s

NOTE:

If IGMP is enabled on user-side interfaces of multiple devices on a shared network segment, the devices must have the same querier configuration. Otherwise, IGMP may not function normally.

The IGMP querier parameters can be configured in the IGMP view or interface view.

  • The configuration in the IGMP view is valid globally, whereas the configuration in the interface view is valid only for the specific interface.
  • If a querier parameter is configured in the interface view and the IGMP view, the configuration in the interface view takes precedence over the configuration in the IGMP view. If a querier parameter is not configured on an interface, the interface uses the configuration in the IGMP view.
  • If non-default configuration is performed in the IGMP view, the default configuration in the interface view does not take effect.

Procedure

  • Configuring global IGMP querier parameters
    1. Run system-view

      The system view is displayed.

    2. Run igmp [ vpn-instance vpn-instance-name ]

      The IGMP view is displayed.

    3. Run timer query interval

      The general query interval is configured.

      The default general query interval is 60 seconds, which is different than the default value 125 seconds defined by RFC documents. A Huawei querier and a non-Huawei querier must send IGMP general query messages at the same interval.

    4. Run robust-count robust-value

      The robustness variable of the IGMP querier is configured.

    5. Run max-response-time interval

      The maximum response time for IGMP General Query messages is configured.

    6. Run timer other-querier-present interval

      The other querier present interval is configured.

    7. Run lastmember-queryinterval interval

      The group-specific or group-and-source-specific query interval is configured.

    8. Run commit

      The configuration is committed.

    NOTE:

    Ensure that the general query interval is larger than the maximum response time for IGMP Query messages and is smaller than the other querier present interval; otherwise IGMP Report messages may not be sent in response to IGMP Query messages in a timely manner, causing the switch to delete multicast entries.

  • Configuring IGMP querier parameters on an interface
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. On an Ethernet interface, run undo portswitch

      The interface is switched to Layer 3 mode.

      By default, an Ethernet interface works in Layer 2 mode.

      The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.

      NOTE:

      If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

    4. For a Layer 3 sub-interface, run the following commands to configure termination of single-tagged packets on it.

      1. Run quit

        Return to the system view.

      2. Run interface interface-type interface-number.subinterface-number

        The Layer 3 sub-interface view is displayed.

        The subinterface-number parameter must specify a Layer 3 sub-interface number on an Ethernet interface that has been switched to the Layer 3 mode.

      3. Run dot1q termination vid vid

        Termination of Dot1q packets is configured on the Layer 3 sub-interface.

        By default, the termination of Dot1q packets is not configured on a Layer 3 sub-interface.

    5. Run igmp timer query interval

      The general query interval is configured.

      The default general query interval is 60 seconds, which is different than the default value 125 seconds defined by RFC documents. A Huawei querier and a non-Huawei querier must send IGMP general query messages at the same interval.

    6. Run igmp robust-count robust-value

      The robustness variable of the IGMP querier is configured.

    7. Run igmp max-response-time interval

      The maximum response time for IGMP General Query messages is configured.

    8. Run igmp timer other-querier-present interval

      The other querier present interval is configured.

    9. Run igmp lastmember-queryinterval interval

      The group-specific or group-and-source-specific query interval is configured.

    10. Run commit

      The configuration is committed.

    NOTE:

    Ensure that the general query interval is larger than the maximum response time for IGMP Query messages and is smaller than the other querier present interval; otherwise IGMP Report messages may not be sent in response to IGMP Query messages in a timely manner, causing the switch to delete multicast entries.

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Updated: 2019-04-20

Document ID: EDOC1100075361

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