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Administering IP Multicast Interfaces A-3
When you select the IGMP option, the interface prompts you to enable or
disable IGMP snooping mode and IGMP query mode. Both are enabled by
default. Under most conditions, IGMP snooping mode and IGMP query
mode should remain enabled.
To enable or disable IGMP, from the top level of the Administration Console,
enter:
ip multicast igmp
1 Enter the slot of the switching module for which you want to enable IGMP.
Select IP stack(s) by slot (2,3,7,9-12|all) [12]:
2 The interface prompts you to enable or disable IGMP query mode and IGMP
snooping mode. If an IP interface has been defined on an EFSM or a TMM
module in the CoreBuilder system, IGMP snooping mode is enabled by
default.
Slots 9-12 - Enter IGMP snooping mode (disabled, enabled)
[enabled]:
enabled
Administering IP
Multicast
Interfaces
The IP multicast interface selections allow you to enable and disable
multicast characteristics on previously defined IP interfaces. A multicast
interface has three characteristics, explained next.
DVMRP Metric Value
The DVMRP metric value determines the cost of a multicast interface. The
higher the cost, the less likely it is that the packets will be routed over the
interface. The default value is 1.
Time To Live (TTL) Threshold
The TTL threshold determines whether the interface will forward multicast
packets to other switches and routers in the subnetwork. If the interface TTL
is greater than the packet TTL, then the interface does not forward the
packet. The default value is 1, which means that the interface will forward
all packets.
Top-Level Menu
system
ethernet
fddi
tokenring
bridge
➧ip
ipx
appletalk
snmp
analyzer
script
logout
interface
route
arp
➧multicast
udpHelper
routing
icmpRouterDiscovery
rip
ping
statistics
dvrmp
➧igmp
interface
tunnel
routeDisplay
cacheDisplay