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Configuration Guide - IP Multicast

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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Configuring the SA Cache

Configuring the SA Cache


To shorten the delay of obtaining multicast information, enable the Source-Active (SA) caching function on the device. The device can locally cache (S, G) entities contained in SA messages. When the device 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 device adds the sender of the Join message to the shortest path tree (SPT) with S as the root.
  • If no matching (S, G) entry is found, the device must wait for the SA message sent by the MSDP peer during the next period.

When there are more (S, G) entries in the cache, they occupy a larger memory space. You can set the maximum number of (S, G) entries to be cached to efficiently protect the device against Denial of Service (DoS) attacks.


  1. Run system-view

    The system view is displayed.

  2. Run msdp [ vpn-instance vpn-instance-name ]

    The MSDP view is displayed.

  3. Run undo cache-sa-disable

    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 to the SA cache.

  5. Run commit

    The configuration is committed.

Updated: 2019-04-20

Document ID: EDOC1100074724

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