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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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Setting Parameters of the SA Request Message

Setting Parameters of the SA Request Message


By default, a switch does not send SA Request message to its MSDP peer when receivers join a group. Instead, the switch waits a Source-Active (SA) message sent by the MSDP peer in the next period, which delays receiving of multicast source information on receivers. To enable new receivers to learn information about active multicast sources quickly, the switch needs to send an SA Request message to the MSDP peer in this case.

After receiving the SA Request message, the remote MSDP peer responds with a message containing the matching (S, G) information. If an SA Request message filtering rule is configured on the remote MSDP peer, the remote MSDP peer responds only to the SA Request messages permitted by the rule.


Before configuring a rendezvous point (RP) to send SA Request messages, disable the SA caching function on the RP and enable the SA caching function on its remote MSDP peer.


  1. Run:


    The system view is displayed.

  2. Run:

    msdp [ vpn-instance vpn-instance-name ]

    The MSDP view is displayed.

  3. Configure an RP to send SA Request messages.


    peer peer-address request-sa-enable

    The RP is configured to send SA Request messages.

  4. (Optional) Configure an SA Request message filtering rule on the remote MSDP peer.


    peer peer-address sa-request-policy [ acl { basic-acl-number | acl-name }  ]

    An SA Request message filtering rule is configured.


    When configuring an access control list (ACL), use the permit parameter to configure the switch to accept only SA Request messages with addresses in a specified range. If no rule is configured in the ACL, the switch discards all SA Request messages.

Updated: 2019-08-21

Document ID: EDOC1000141903

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