![background image](http://html1.mh-extra.com/html/foundry-networks/fastiron-edge-switch-x424/fastiron-edge-switch-x424_manual_2324269443.webp)
Configuring IP Multicast Traffic Reduction
December 2005
© Foundry Networks, Inc.
18 - 3
Syntax:
[no] ip multicast
NOTE:
If the "route-only" feature is enabled on the Layer 3 Switch, then IP Multicast Traffic Reduction will not be
supported.
NOTE:
This feature is not supported on the default VLAN of Layer 3 Switches.
To verify that IP Multicast Traffic Reduction is enabled, enter the following command at any level of the CLI:
FESX424 Router(config)# show ip multicast
IP multicast is enabled - Active
Syntax:
show ip multicast
Changing the IGMP Mode
When you enable IP Multicast Traffic Reduction on the device, IGMP also is enabled. The device uses IGMP to
maintain a table of the Group Membership reports received by the device. You can use active or passive IGMP
mode. The default mode is passive.
•
Active – When active IGMP mode is enabled, a Foundry device actively sends out IGMP queries to identify IP
multicast groups on the network and makes entries in the IGMP table based on the Group Membership
reports received from the network.
NOTE:
Routers in the network generally handle this operation. Use the active IGMP mode only when the
device is in a stand-alone Layer 2 Switched network with no external IP multicast router attachments. In this
case, enable the active IGMP mode on only one of the devices and leave the other devices configured for
passive IGMP mode.
•
Passive – When passive IGMP mode is enabled, the device listens for IGMP Group Membership reports but
does not send IGMP queries. The passive mode is sometimes called “IGMP snooping”. Use this mode when
another device in the network is actively sending queries.
To enable active IGMP, enter the following command:
FESX424 Router(config)# ip multicast active
FESX424 Router(config)# write memory
FESX424 Router(config)# end
FESX424 Router# reload
Syntax:
[no] ip multicast active | passive
To enable passive IGMP, enter the following command:
FESX424 Router(config)# ip multicast passive
FESX424 Router(config)# write memory
FESX424 Router(config)# end
FESX424 Router# reload
Disabling IGMP on Individual Ports
NOTE:
IP Multicast Traffic Reduction cannot be disabled on individual ports of a Layer 3 Switch. You cannot use
the
ip-multicast-disable
command that is available on Layer 2 Switches. IP multicast must be enabled and
disabled globally on Layer 3 Switches.
By default, when you enable IP multicast on a Foundry device, all ports on the device are configured for IGMP. If
you are using active IGMP, all ports can send IGMP queries and receive IGMP reports. If you are using passive
IGMP, all ports can receive IGMP queries.
Summary of Contents for FastIron Edge Switch X424
Page 36: ...Foundry Configuration Guide for the FESX FSX and FWSX 2 12 Foundry Networks Inc December 2005...
Page 56: ...Foundry Configuration Guide for the FESX FSX and FWSX 3 20 Foundry Networks Inc December 2005...
Page 70: ...Foundry Configuration Guide for the FESX FSX and FWSX 4 14 Foundry Networks Inc December 2005...
Page 198: ...Foundry Configuration Guide for the FESX FSX and FWSX 8 38 Foundry Networks Inc December 2005...
Page 316: ...Foundry Configuration Guide for the FESX FSX and FWSX 12 26 Foundry Networks Inc December 2005...
Page 350: ...Foundry Configuration Guide for the FESX FSX and FWSX 15 12 Foundry Networks Inc December 2005...
Page 458: ...Foundry Configuration Guide for the FESX FSX and FWSX 18 18 Foundry Networks Inc December 2005...
Page 712: ...Foundry Configuration Guide for the FESX FSX and FWSX 22 32 Foundry Networks Inc December 2005...
Page 760: ...Foundry Configuration Guide for the FESX FSX and FWSX A 34 Foundry Networks Inc December 2005...
Page 796: ...Foundry Configuration Guide for the FESX FSX and FWSX C 18 Foundry Networks Inc December 2005...
Page 820: ...Foundry Configuration Guide for the FESX FSX and FWSX E 10 Foundry Networks Inc December 2005...