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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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Configuring SA Caching

Configuring SA Caching


To shorten the delay before obtaining multicast information, enable the SA caching function. The switch then caches (S, G) entities obtained from SA messages. When the switch receives a new Join message, it searches the local cache for the (*, G) entry carried in the message:

  • If the matching (S, G) entry is found, the switch adds the sender of the Join message to the shortest path tree (SPT) with source S as the root.
  • If no matching (S, G) entry is found, the switch must wait the SA message sent by the MSDP peer during the next period.

As (S, G) entries accumulate in the cache, a larger memory space is occupied. You can set the maximum number of (S, G) entries allowed in the cache to protect the switch against Denial of Service (DoS) attacks.


  1. Run:


    The system view is displayed.

  2. Run:

    msdp [ vpn-instance vpn-instance-name ]

    The MSDP view is displayed.

  3. Run:


    The SA caching function is enabled.

    By default, the SA caching function is enabled on the switch that has a remote MSDP peer specified.

  4. (Optional) Run:

    peer peer-address sa-cache-maximum sa-limit

    The maximum number of (S, G) entries is set.

    By default, a maximum of 8192 (S, G) entries can be saved in the SA cache.

Updated: 2019-08-21

Document ID: EDOC1000141903

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