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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 the Multicast Hash Algorithm

Configuring the Multicast Hash Algorithm


To improve multicast forwarding performance, the switch uses a hash algorithm to learn multicast addresses. When a large number of multicast hash collisions occur, the switch will fail to learn some multicast addresses. If this occurs, you can change the multicast hash algorithm to reduce hash collisions.

MAC addresses are randomly distributed on a network, so the best hash algorithm cannot be determined. The default hash algorithm is the best algorithm in most cases, so changing the hash algorithm is not recommended.

After changing the hash algorithm, restart the switch for the configuration to take effect.

Default Configuration

The default multicast hash algorithm is crc-32-lower.


  1. Run:


    The system view is displayed.

  2. Run:

    set multicast-hash-mode { crc-32-upper | crc-32-lower | lsb | crc-16-upper | crc-16-lower }

    The multicast hash algorithm is specified.


    This command is not supported by X series cards.

Updated: 2019-08-21

Document ID: EDOC1000141903

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