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Configuration Guide - IP Multicast

S7700 and S9700 V200R013C00

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, IPv4 PIM, IPv6 PIM, MSDP, multicast VPN, layer 3 multicast CAC, IPv4 multicast route management, IPv6 multicast route management, IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN replication, layer 2 multicast CAC, multicast network management.
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Adjusting Control Parameters for Join/Prune Messages

Adjusting Control Parameters for Join/Prune Messages

Context

A multicast device sends Join messages upstream to require forwarding of multicast data, and Prune messages to stop the forwarding of multicast data. You can adjust control parameters for Join/Prune messages as required. If there is no special requirement, the default values are recommended.

Pre-configuration Tasks

Before adjusting control parameters for Join/Prune messages, complete the following tasks:

  • Configure an IPv6 unicast routing protocol to ensure normal unicast routing on the network.
  • Enable IPv6 PIM-SM.

Configuration Procedure

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

Adjusting Time Parameters for Join/Prune Messages

Context

A PIM device periodically sends Join/Prune messages to an upstream device to update the forwarding state. When the upstream device receives a Join/Prune message, it starts a timer and sets the timer value to the holdtime of the Join/Prune message. If the device does not receive any Join/Prune message when the timer expires, it acts as follows:

  • If the previously received Join/Prune message is sent by a host to join a multicast group, the device stops sending multicast data to the downstream interface of the multicast group.
  • If the previously received Join/Prune message is sent to prune the downstream interface of a multicast group, the device starts to send multicast data packets to the downstream interface.

Therefore, the interval for sending Join/Prune messages must be smaller than the holdtime of a Join/Prune message.

NOTE:

The interval for sending Join/Prune messages and the holdtime of Join/Prune messages can be set globally or on an interface. If you configure the two parameters in the global PIM-IPv6 view and in the interface view simultaneously, the configuration in the interface view takes effect.

Default Settings

Table 5-17 lists the default settings of time parameters for Join/Prune messages.

Table 5-17  Default settings of time parameters for Join/Prune messages
Parameter Default Setting

Interval for sending Join/Prune messages

60s

Holdtime of Join/Prune messages

210s

Procedure

  • Global configuration
    1. Run system-view

      The system view is displayed.

    2. Run pim-ipv6

      The PIM-IPv6 view is displayed.

    3. Run timer join-prune interval

      The interval for sending Join/Prune messages is configured.

    4. Run holdtime join-prune interval

      The holdtime of Join/Prune messages is configured.

  • Configuration 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. (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 pim ipv6 timer join-prune interval

      The interval for sending Join/Prune messages is configured.

    5. Run pim ipv6 holdtime join-prune interval

      The holdtime of Join/Prune messages is configured.

Adjusting the Information Carrying Capacity of Join/Prune Messages

Context

You can configure the maximum size of each Join/Prune message, maximum number of entries in a Join/Prune message, and Join/Prune message transmission method on the switch to adjust join information and prune information sent to upstream interfaces.

  • If a PIM neighbor has a low performance and spends a long time to process each Join/Prune message, set a smaller size for each Join/Prune message on the switch to reduce the number of (S, G) entries carried in Join/Prune messages. This mitigates the pressure on the PIM neighbor.
  • If the throughput of Join/Prune messages on the PIM neighbor is low, the neighbor may fail to process Join/Prune messages in a timely manner, causing route flapping. To prevent this problem, set a smaller queue size for periodically sending Join/Prune messages to reduce the number of (S, G) entries carried in Join/Prune message sent to the PIM neighbor per second. Then the switch sends Join/Prune messages in batches to the PIM neighbor, with a few Join/Prune messages in each batch.
  • By default, Join/Prune messages are transmitted to upstream neighbors in a package to improve the transmission efficiency. You can disable the package function as required.
Default Settings

Table 5-18 lists the default settings of Join/Prune messages.

Table 5-18  Default settings of Join/Prune messages
Parameter Default Setting

Maximum size of each Join/Prune message

8100 bytes

Maximum number of entries contained in Join/Prune messages

1020

Join/Prune message transmission method

Encapsulated in a package

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run pim-ipv6

    The PIM-IPv6 view is displayed.

  3. Run join-prune max-packet-length packet-length

    The maximum size of each PIM-SM Join/Prune message to be sent is configured.

  4. Run join-prune periodic-messages queue-size queue-size

    The maximum number of entries in PIM-SM Join/Prune messages sent in a second is configured.

  5. Run join-prune triggered-message-cache disable

    The function to package Join/Prune messages in real time is disabled.

Adjusting Control Parameters for Prune Delay

Context

LAN-delay specifies the delay from when a device receives a Prune message from a downstream interface to when it sends the Prune message to an upstream interface. A PIM device does not prune the corresponding downstream interface immediately after it sends the Prune message. If another device still requests multicast data, it needs to send a Join message to the upstream device within this period. The period for overriding the Prune message is called override-interval. The delay from when a PIM device receives a Prune message to when it performs the prune action is the sum of the LAN-delay and override-interval.

NOTE:

The LAN-delay and override-interval are configured globally or on an interface. If you configure the LAN-delay and override-interval in the global PIM-IPv6 view and in the interface view simultaneously, the configuration in the interface view takes effect.

Default Settings

Table 5-19 lists the default settings of control parameters for prune delay.

Table 5-19  Default settings of control parameters for prune delay
Parameter Default Setting

LAN-delay

500 ms

Override-interval

2500 ms

Procedure

  • Global configuration
    1. Run system-view

      The system view is displayed.

    2. Run pim-ipv6

      The PIM-IPv6 view is displayed.

    3. Run hello-option lan-delay interval

      The delay for transmitting messages in a LAN is configured.

    4. Run hello-option override-interval interval

      The interval for overriding the prune action is configured.

  • Configuration 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. (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 pim ipv6 hello-option lan-delay interval

      The delay for transmitting messages in a LAN is configured.

    5. Run pim ipv6 hello-option override-interval interval

      The interval for overriding the prune action is configured.

Configuring a Join Information Filtering Policy

Context

To prevent access of unauthorized users, configure a join information filtering policy to specify a valid source address range for join information contained in Join/Prune messages.

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 pim ipv6 join-policy { asm { basic-acl6-number | acl6-name acl6-name } | ssm { advanced-acl6-number | acl6-name acl6-name } | advanced-acl6-number | acl6-name acl6-name }

    A Join information filtering policy is configured and a valid source address range is specified.

    NOTE:

    When configuring an ACL rule for the interface, use the permit parameter to configure the interface to accept only Join information with addresses in a specified range. If no rule is configured in the ACL, the interface discards Join information in Join/Prune messages from all addresses.

Verifying the Configuration of Control Parameters for Join/Prune Messages

Prerequisites

After control parameters for Join/Prune messages are configured, check information about the IPv6 PIM interface, 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 following commands to check the number of sent or received IPv6 PIM control messages.

    • display pim ipv6 control-message counters [ message-type { assert | graft | graft-ack | hello | join-prune | state-refresh | bsr } | interface interface-type interface-number ] *
    • display pim ipv6 control-message counters message-type { probe | register | register-stop | crp }

  • Run the following commands to check the IPv6 PIM routing table.

    • 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 ] ]
    • 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 } ] *

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Updated: 2019-04-08

Document ID: EDOC1100065742

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