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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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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 system-view

    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.

    Run 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.

    Run 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: 2019-04-08

Document ID: EDOC1100065742

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