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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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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 Settings

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


  1. Run system-view

    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: 2019-04-08

Document ID: EDOC1100065742

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