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Configuration Guide - IP Multicast

S7700 and S9700 V200R010C00

This document describes IP multicast basics and how to configure IP multicast features, including IGMP/MLD, PIM (IPv4&IPv6), MSDP, multicast VPN, Layer 3 multicast CAC, Layer 2 multicast CAC, IGMP/MLD snooping, and multicast VLAN, IPv4&IPv6 multicast route management, static multicast MAC address, multicast network.
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Adjusting State Refresh Control Parameters

Adjusting State Refresh Control Parameters

Context

IPv6 PIM-DM provides a state refresh mechanism to prevent pruned interfaces from resuming multicast forwarding due to prune state timeout. The first-hop device directly connected to a multicast source sends State-Refresh messages at intervals to reset the prune timers on pruned interfaces and maintain the shortest path tree (SPT).

Configuration Process

Configuration tasks in this section can be performed in any sequence.

Disabling Forwarding of State-Refresh Messages

Context

Pruned interfaces resume multicast forwarding when the prune timer expires, even though no downstream devices need to receive multicast data. To prevent this problem, the PIM device directly connected to a multicast source sends State-Refresh messages at intervals to update the state of (S, G) entries. A State-Refresh message is propagated to downstream devices hop by hop to reset prune timers on all the PIM devices. In this way, interfaces that do not need to forward multicast data remain in prune state.

By default, all PIM devices can forward State-Refresh messages. Disable forwarding of State-Refresh messages when you want multicast data to be flooded on the entire network in every flood-prune process and do not need to suppress multicast forwarding on pruned interfaces.

NOTE:

Disabling forwarding of State-Refresh messages is not recommended because State-Refresh messages conserve network resources.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    interface interface-type interface-number

    The interface view is displayed.

  3. (Optional) 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.

  4. Run:

    undo pim ipv6 state-refresh-capable

    Forwarding of State-Refresh messages is disabled on the interface.

    To enable the interface to forward State-Refresh messages again, run the pim ipv6 state-refresh-capable command on the interface.

Adjusting Time Parameters for State-Refresh Messages

Context

The PIM device directly connected to a multicast source sends State-Refresh messages at intervals to downstream devices. State-Refresh messages are flooded on the entire network, so a device may receive duplicate State-Refresh messages within a short time. To prevent this problem, a switch starts a timer when receiving a State-Refresh message for an (S, G) entry. The timer value is the suppression time of the State-Refresh message. If the switch receives the same State-Refresh messages before the timer expires, it drops the received State-Refresh messages.

Default Configuration

Table 5-9 lists the default configuration of time parameters for State-Refresh messages.

Table 5-9  Default configuration of time parameters for State-Refresh messages
Parameter Default Setting

Interval for sending State-Refresh messages

60s

Suppression time of duplicate State-Refresh messages

30s

Procedure

  • Set the interval for sending State-Refresh messages on the switch directly connected to a multicast source.
    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      pim-ipv6

      The PIM-IPv6 view is displayed.

    3. Run:

      state-refresh-interval interval

      The interval for sending State-Refresh messages is set.

  • Set the suppression time of duplicate State-Refresh messages on all the PIM devices.
    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      pim-ipv6

      The PIM-IPv6 view is displayed..

    3. Run:

      state-refresh-rate-limit interval

      The suppression time of duplicate State-Refresh messages is set.

Setting the TTL Value of State-Refresh Messages

Context

When a device receives a State-Refresh message, it reduces the time to live (TTL) value of the message by 1 and forwards the message to downstream devices. The State-Refresh message is transmitted on the network until its TTL value reduces to 0. On a small-scale network, State-Refresh messages with a large TTL value are transmitted circularly. To control the transmission range of State-Refresh messages, set a proper TTL value for State-Refresh messages according to the network scale.

NOTE:

Because State-Refresh messages are originated from the first-hop device connected to a multicast source, the TTL value of State-Refresh messages must be configured on the first-hop device.

Default Configuration

The default TTL value of State-Refresh messages is 255.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    pim-ipv6

    The PIM-IPv6 view is displayed.

  3. Run:

    state-refresh-ttl ttl-value

    The TTL value of State-Refresh messages is set.

Checking the Configuration

Context

After adjusting state refresh control parameters, check IPv6 PIM interface information, statistics about IPv6 PIM control messages, and IPv6 PIM routing table.

Procedure

  • Run the display pim ipv6 interface [ interface-type interface-number | up | down ] [ verbose ] command to check IPv6 PIM information on an interface.
  • Run the display pim ipv6 control-message counters [ message-type { assert | graft | graft-ack | hello | join-prune | state-refresh | bsr } | interface interface-type interface-number ] * command to check the number of IPv6 PIM control messages sent and received from an interface.
  • Run the following commands to check the IPv6 PIM routing table:

    • Run the display pim ipv6 routing-table [ ipv6-source-address [ mask mask-length ] | ipv6-group-address [ mask mask-length ] | flags flag-value | fsm | incoming-interface { interface-type interface-number | register } | mode { dm | sm | ssm } | outgoing-interface { exclude | include | match } { interface-type interface-number | none | register } ] * [ outgoing-interface-number [ number ] ] command to check detailed information about the IPv6 PIM routing table.

    • Run the display pim ipv6 routing-table brief [ ipv6-source-address [ mask mask-length ] | ipv6-group-address [ mask mask-length ] | incoming-interface { interface-type interface-number | register } ] * command to check brief information about the IPv6 PIM routing table.

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Updated: 2019-08-21

Document ID: EDOC1000141903

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