3com 8807 Reference Guide

You can use the multicast-suppression command repeatedly. The effective 
multicast suppression ratio value is the one last updated.

c 

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You cannot enable both broadcast suppression and multicast suppression 
simultaneously on the same card. Namely, once you have enabled broadcast 
suppression on some ports of a card, you cannot enable multicast suppression 
on the other ports of the card, and vice versa. Although the commands are 
based on ports, the mutual exclusion between these two commands is based 
on cards.

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If multicast suppression is enabled, broadcast packets are also suppressed at 
the same time, while broadcast suppression does not work on multicast 
packets.

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No distinction is made between known multicast and unknown multicast for 
multicast suppression.

Related command: broadcast-suppression.

# Set the multicast suppression ratio to 40%.

<SW8800> system-view

 

System View: return to User View with Ctrl+Z.

 

[SW8800]interface Ethernet 2/1/1

 

[3Com-Ethernet2/1/1] multicast-suppression 40 

# Set the multicast suppression bandwidth to 40Mbit.

[3Com-Ethernet2/1/1] multicast-suppression bandwidth 40 

# Disable multicast suppression.

[3Com-Ethernet2/1/1] undo multicast-suppression 

reset multicast forwarding-table [ statistics ] { all | { group-address [ mask { 
group-mask | group-mask-length } ] | source-address [ mask { source-mask | 
source-mask-length } ] | incoming-interface { null NULL-interface-number | 
interface-type interface-number } }* }

User view

statistics: If it is selected, the system clears the statistic information of MFC 
forward entries. Otherwise, the system clears MFC forward entries.

all: All MFC forward entries.

group-address: Multicast group address.

group-mask: Mask of multicast group address