3com 2500 User Guide

With the IP multicast interface selections, you can enable and disable 
multicast characteristics on previously defined IP interfaces.

A multicast interface has three characteristics:

■

DVMRP Metric Value — Determines the cost of a multicast interface. 
Use a higher cost to decrease the likelihood that multicast packets will 
be routed over the interface. The default value is 1. 

■

Time To Live (TTL) Threshold — Determines whether the interface 
forwards multicast packets to other switches and routers in the 
subnetwork. If you do not want the interface to forward packets, use 
an interface TTL greater than the packet TTL. If you want the interface 
to forward all packets, use the default value of 1.

■

Rate Limit — Determines how fast multicast traffic can travel over 
the interface in packets per second. If multicast traffic exceeds the rate 
limit, the system drops packets to maintain the set rate. If you want no 
rate limit, use the default value of 0. If you want to reduce traffic over 
the interface, use a low rate limit. 

To display a multicast interface:

1 From the top level of the Administration Console, enter:

2 Enter the index numbers of the interfaces to display.

This example shows a multicast interface configuration:

system
ethernet
fddi
atm
bridge

➧

ip
ipx
appletalk
snmp
analyzer
script
logout

interface
route
arp
atmArpServer

➧

multicast
udpHelper
icmpRouterDiscovery
rip
ping
statistics

dvmrp
igmp

➧

interface
tunnel
routeDisplay
cacheDisplay

➧

display
enable
disable

Index  Local Address   Metric  Threshold  RateLimit   State

 1     158.101.112.32   1      1            0         querier leaf

                        pkts   in:0    pkts out:0

DVRMP is disabled, IGMP snooping is enabled