I Commands

This chapter describes the Cisco NX-OS IGMP snooping commands that begin with I.

ip igmp snooping (Global)

To enable IGMP snooping, use the ip igmp snooping command. To disable IGMP snooping, use the no form of this command.

ip igmp snooping

no ip igmp snooping

 
Syntax Description

This command has no arguments or keywords.

 
Command Default

Enabled

 
Command Modes

Global configuration mode

 
Command History

Release
Modification

5.0(3)N1(1)

This command was introduced.

 
Usage Guidelines

If the global configuration of IGMP snooping is disabled, then all VLANs are treated as disabled, whether they are enabled or not.

This command does not require a license.

Examples

This example shows how to enable IGMP snooping:

switch(config)# ip igmp snooping
switch(config)#
 

This example shows how to disable IGMP snooping:

switch(config)# no ip igmp snooping
switch(config)#
 

 
Related Commands

Command
Description

show ip igmp snooping

Displays IGMP snooping information.

ip igmp snooping (VLAN)

To enable IGMP snooping on specified VLAN interfaces, use the ip igmp snooping command. To disable IGMP snooping on the interface, use the no form of this command.

ip igmp snooping

no ip igmp snooping

 
Syntax Description

This command has no arguments or keywords.

 
Command Default

Enabled

 
Command Modes

VLAN configuration mode

 
Command History

Release
Modification

5.0(3)N1(1)

This command was introduced.

 
Usage Guidelines

If the global configuration of IGMP snooping is disabled, then all VLANs are treated as disabled, whether they are enabled or not.

This command does not require a license.

Examples

This example shows how to enable IGMP snooping on a VLAN interface:

switch(config)# vlan 1
switch(config-vlan)# ip igmp snooping
switch(config-vlan)#
 

This example shows how to disable IGMP snooping on a VLAN interface:

switch(config)# vlan 1
switch(config-vlan)# no ip igmp snooping
switch(config-vlan)#
 

 
Related Commands

Command
Description

show ip igmp snooping

Displays IGMP snooping information.

ip igmp snooping event-history

To configure the size of the IGMP snooping event history buffers, use the ip igmp snooping event-history command. To revert to the default buffer size, use the no form of this command.

ip igmp snooping event-history { igmp-snoop-internal | mfdm | mfdm-sum | rib | vlan | vlan-events | vpc } size buffer-size

no ip igmp snooping event-history { igmp-snoop-internal | mfdm | mfdm-sum | rib | vlan | vlan-events | vpc } size buffer-size

 
Syntax Description

igmp-snoop-
internal

Clears the IGMP snooping internal event history buffer.

mfdm

Clears the multicast FIB distribution (MFDM) event history buffer.

mfdm-sum

Clears the MFDM sum event history buffer.

rib

Clears the Routing Information Base (RIB) event history buffer.

vlan

Clears the VLAN event history buffer.

vlan-events

Clears the VLAN-event event history buffer.

vpc

Clears the virtual port channel (vPC) event history buffer.

size

Specifies the size of the buffer to allocate.

buffer-size

Buffer size that is one of the following values: disabled, large, medium, or small. The default buffer size is small.

 
Command Default

All history buffers are allocated as small.

 
Command Modes

Global configuration mode

 
Command History

Release
Modification

5.0(3)N1(1)

This command was introduced.

 
Usage Guidelines

This command does not require a license.

Examples

This example shows how to configure the IGMP snooping VLAN event history buffer size:

switch(config)# ip igmp snooping event-history vlan size large
switch(config)#
 

 
Related Commands

Command
Description

clear ip igmp snooping event-history

Clears the contents of the IGMP snooping event history buffers.

show ip igmp snooping event-history

Displays information in the IGMP snooping event history buffers.

show running-config igmp

Displays information about the IGMP running-system configuration.

ip igmp snooping explicit-tracking

To enable tracking of IGMPv3 membership reports from individual hosts for each port on a per-VLAN basis, use the ip igmp snooping explicit-tracking command. To disable tracking, use the no form of this command.

ip igmp snooping explicit-tracking

no ip igmp snooping explicit-tracking

 
Syntax Description

This command has no arguments or keywords.

 
Command Default

Enabled

 
Command Modes

VLAN configuration mode

 
Command History

Release
Modification

5.0(3)N1(1)

This command was introduced.

 
Usage Guidelines

This command does not require a license.

Examples

This example shows how to enable tracking of IGMPv3 membership reports on a VLAN interface:

switch(config)# vlan 1
switch(config-vlan)# ip igmp snooping explicit-tracking
switch(config-vlan)#
 

This example shows how to disable IGMP snooping on a VLAN interface:

switch(config)# vlan 1
switch(config-vlan)# no ip igmp snooping explicit-tracking
switch(config-vlan)#
 

 
Related Commands

Command
Description

show ip igmp snooping

Displays IGMP snooping information.

ip igmp snooping fast-leave

To enable support of IGMPv2 hosts that cannot be explicitly tracked because of the host report suppression mechanism of the IGMPv2 protocol, use the ip igmp snooping fast-leave command. To disable support of IGMPv2 hosts, use the no form of this command.

ip igmp snooping fast-leave

no ip igmp snooping fast-leave

 
Syntax Description

This command has no arguments or keywords.

 
Command Default

Disabled

 
Command Modes

VLAN configuration mode

 
Command History

Release
Modification

5.0(3)N1(1)

This command was introduced.

 
Usage Guidelines

When you enable fast leave, the IGMP software assumes that no more than one host is present on each VLAN port.

This command does not require a license.

Examples

This example shows how to enable support of IGMPv2 hosts:

switch(config)# vlan 1
switch(config-vlan)# ip igmp snooping fast-leave
switch(config-vlan)#
 

This example shows how to disable support of IGMPv2 hosts:

switch(config)# vlan 1
switch(config-vlan)# no ip igmp snooping fast-leave
switch(config-vlan)#
 

 
Related Commands

Command
Description

show ip igmp snooping

Displays IGMP snooping information.

ip igmp snooping last-member-query-interval

To configure a query interval in which the software removes a group, use the ip igmp snooping last-member-query-interval command. To reset the query interval to the default, use the no form of this command.

ip igmp snooping last-member-query-interval interval

no ip igmp snooping last-member-query-interval [ interval ]

 
Syntax Description

interval

Query interval in seconds. The range is from 1 to 25. The default is 1.

 
Command Default

The query interval is 1.

 
Command Modes

VLAN configuration mode

 
Command History

Release
Modification

5.0(3)N1(1)

This command was introduced.

 
Usage Guidelines

This command does not require a license.

Examples

This example shows how to configure a query interval in which the software removes a group:

switch(config)# vlan 1
switch(config-vlan)# ip igmp snooping last-member-query-interval 3
switch(config-vlan)#
 

This example shows how to reset a query interval to the default:

switch(config)# vlan 1
switch(config-vlan)# no ip igmp snooping last-member-query-interval
switch(config-vlan)#
 

 
Related Commands

Command
Description

show ip igmp snooping

Displays IGMP snooping information.

ip igmp snooping link-local-groups-suppression

To enable suppression of IGMP reports from link-local groups, use the ip igmp snooping link-local-groups-suppression command. To disable suppression of these reports, use the no form of this command.

ip igmp snooping link-local-groups-suppression

no ip igmp snooping link-local-groups-suppression

 
Syntax Description

This command has no arguments or keywords.

 
Command Default

Enabled

 
Command Modes

Global configuration mode
VLAN configuration mode

 
Command History

Release
Modification

5.0(3)N1(1)

This command was introduced.

 
Usage Guidelines

If this setting is disabled on the entire device, then it is disabled on all VLANs on device, irrespective of the specific VLAN setting.

This command does not require a license.

Examples

This example shows how to enable suppression of IGMP reports from link-local groups:

switch(config)# vlan 1
switch(config-vlan)# ip igmp snooping link-local-groups-suppression
switch(config-vlan)#
 

This example shows how to disable suppression of IGMP reports from link-local groups:

switch(config)# vlan 1
switch(config-vlan)# no ip igmp snooping link-local-groups-suppression
switch(config-vlan)#

 
Related Commands

Command
Description

show ip igmp snooping

Displays IGMP snooping information.

ip igmp snooping mrouter interface

To configure a static connection to a multicast router, use the ip igmp snooping mrouter interface command. To remove the static connection, use the no form of this command.

ip igmp snooping mrouter interface { ethernet slot / port | port-channel number [. sub_if_number ]}

no ip igmp snooping mrouter interface { ethernet slot / port | port-channel number [. sub_if_number ]}

 
Syntax Description

ethernet slot / port

(Optional) Specifies the Ethernet interface and the slot number and port number. The slot number is from 1 to 255, and the port number is from 1 to 128.

port-channel number

(Optional) Specifies the EtherChannel interface and EtherChannel number. The range is from 1 to 4096.

sub_if_number

(Optional) Subinterface number. The range is from 1 to 4093.

 
Command Default

None

 
Command Modes

VLAN configuration mode

 
Command History

Release
Modification

5.0(3)N1(1)

This command was introduced.

 
Usage Guidelines

The interface to the router must be in the selected VLAN.

This command does not require a license.

Examples

This example shows how to configure a static connection to a multicast router:

switch(config)# vlan 1
switch(config-vlan)# ip igmp snooping mrouter interface ethernet 2/1
switch(config-vlan)#
 

This example shows how to remove a static connection to a multicast router:

switch(config)# vlan 1
switch(config-vlan)# no ip igmp snooping mrouter interface ethernet 2/1
switch(config-vlan)#
 

 
Related Commands

Command
Description

show ip igmp snooping

Displays IGMP snooping information.

ip igmp snooping mrouter vpc-peer-link

To configure a static connection to a virtual port channel (vPC) peer link, use the ip igmp snooping mrouter vpc-peer-link command. To remove the static connection, use the no form of this command.

ip igmp snooping mrouter vpc-peer-link

no ip igmp snooping mrouter vpc-peer-link

 
Syntax Description

This command has no arguments or keywords.

 
Command Default

None

 
Command Modes

Global configuration mode

 
Command History

Release
Modification

5.0(3)N1(1)

This command was introduced.

 
Usage Guidelines

By default, a vPC Peer-link is considered an IGMP snooping mrouter port. The multicast traffic is sent over to a peer-link for the source VLAN and for each receiving VLAN. If you use the no ip igmp snooping mrouter vpc-peer-link command, the multicast traffic is not sent over to a peer-link for the source VLAN and receiver VLAN unless there are orphan ports in the VLAN.

Note In Cisco NX-OS Release 5.0(3)N1(1), the no ip igmp snooping mrouter vpc-peer-link command is not supported in topologies where there is a dual-homed Cisco Nexus 2000 Series Fabric Extender attached to a Cisco Nexus 5000 Series switch.

This command does not require a license.

Examples

This example shows how to configure a static connection to a vPC peer link:

switch(config)# ip igmp snooping mrouter vpc-peer-link
switch(config)#
 

This example shows how to remove a static connection to a vPC peer link:

switch(config)# no ip igmp snooping mrouter vpc-peer-link
Warning: IGMP Snooping mrouter vpc-peer-link should be globally disabled on peer
VPC switch as well.
switch(config)#
 

 
Related Commands

Command
Description

show ip igmp snooping

Displays IGMP snooping information.

ip igmp snooping optimise-multicast-flood

Note Effective with Cisco NX-OS release 6.0(2)N2(1), the Optimized multicast flooding (OMF) command is not available in Cisco Nexus 5000 and 6000 series switches.

To configure Optimized Multicast Flood (OMF) on all VLANs, use the ip igmp snooping optimise-multicast-flood command. To remove the OMF from all VLANs, use the no form of this command.

ip igmp snooping optimise-multicast-flood

no ip igmp snooping optimise-multicast-flood

 
Syntax Description

This command has no arguments or keywords.

 
Command Default

None

 
Command Modes

Global configuration mode

 
Command History

Release
Modification

5.0(3)N1(1)

This command was introduced.

6.0(2)N2(1)

This command is removed.

 
Usage Guidelines

This command does not require a license.

Examples

This example shows how to configure OMF on all VLANs:

switch(config)# ip igmp snooping optimise-multicast-flood
switch(config)#
 

This example shows how to remove OMF from all VLANs:

switch(config)# no ip igmp snooping optimise-multicast-flood
switch(config)#
 

 
Related Commands

Command
Description

show ip igmp snooping

Displays IGMP snooping information.

ip igmp snooping querier

To configure a snooping querier on an interface when you do not enable Protocol Independent Multicast (PIM) because multicast traffic does not need to be routed, use the ip igmp snooping querier command. To remove the snooping querier, use the no form of this command.

ip igmp snooping querier querier

no ip igmp snooping querier [ querier ]

 
Syntax Description

querier

Querier IP address.

 
Command Default

None

 
Command Modes

VLAN configuration mode

 
Command History

Release
Modification

5.0(3)N1(1)

This command was introduced.

 
Usage Guidelines

The querier IP address cannot be a multicast address.

This command does not require a license.

Examples

This example shows how to configure a snooping querier:

switch(config)# vlan 1
switch(config-vlan)# ip igmp snooping querier 172.20.52.106
switch(config-vlan)#
 

This example shows how to disable IGMP snooping on a VLAN interface:

switch(config)# vlan 1
switch(config-vlan)# no ip igmp snooping querier
switch(config-vlan)#
 

 
Related Commands

Command
Description

show ip igmp snooping

Displays IGMP snooping information.

ip igmp snooping report-suppression

To enable limiting the membership report traffic sent to multicast-capable routers, use the ip igmp snooping report-suppression command. To disable the limitation, use the no form of this command.

ip igmp snooping report-suppression

no ip igmp snooping report-suppression

 
Syntax Description

This command has no arguments or keywords.

 
Command Default

Enabled

 
Command Modes

Global configuration mode
VLAN configuration mode

 
Command History

Release
Modification

5.0(3)N1(1)

This command was introduced.

 
Usage Guidelines

When you disable report suppression, all IGMP reports are sent as is to multicast-capable routers.

This command does not require a license.

Examples

This example shows how to enable limiting the membership report traffic:

switch(config)# vlan 1
switch(config-vlan)# ip igmp snooping report-suppression
switch(config-vlan)#
 

This example shows how to disable limiting the membership report traffic:

switch(config)# vlan 1
switch(config-vlan)# no ip igmp snooping report-suppression
switch(config-vlan)#
 

 
Related Commands

Command
Description

show ip igmp snooping

Displays IGMP snooping information.

ip igmp snooping static-group

To configure a Layer 2 port of a VLAN as a static member of a multicast group, use the ip igmp snooping static-group command. To remove the static member, use the no form of this command.

ip igmp snooping static-group group [ source source ] interface { ethernet slot / port | port-channel number [. sub_if_number ]}

no ip igmp snooping static-group group [ source source ] interface { ethernet slot / port | port-channel number [. sub_if_number ]}

 
Syntax Description

group

Group IP address.

source source

(Optional) Configures a static (S, G) channel for the source IP address.

interface

Specifies an interface for the static group.

ethernet slot / port

Specifies the Ethernet interface and the slot number and port number. The slot number is from 1 to 255, and the port number is from 1 to 128.

port-channel number

Specifies the EtherChannel interface and EtherChannel number. The range is from 1 to 4096.

sub_if_number

(Optional) Subinterface number. The range is from 1 to 4093.

 
Command Default

None

 
Command Modes

VLAN configuration mode

 
Command History

Release
Modification

5.0(3)N1(1)

This command was introduced.

 
Usage Guidelines

This command does not require a license.

Examples

This example shows how to configure a static member of a multicast group:

switch(config)# vlan 1
switch(config-vlan)# ip igmp snooping static-group 230.0.0.1 interface ethernet 2/1
switch(config-vlan)#
 

This example shows how to remove a static member of a multicast group:

switch(config)# vlan 1
switch(config-vlan)# no ip igmp snooping static-group 230.0.0.1 interface ethernet 2/1
switch(config-vlan)#
 

 
Related Commands

Command
Description

show ip igmp snooping

Displays IGMP snooping information.

ip igmp snooping v3-report-suppression (Global)

To configure IGMPv3 report suppression and proxy reporting for VLANs on the entire device, use the ip igmp snooping v3-report-suppression command. To remove IGMPv3 report suppression, use the no form of this command.

ip igmp snooping v3-report-suppression

no ip igmp snooping v3-report-suppression

 
Syntax Description

This command has no arguments or keywords.

 
Command Default

Disabled

 
Command Modes

Global configuration mode

 
Command History

Release
Modification

5.0(3)N1(1)

This command was introduced.

 
Usage Guidelines

This command does not require a license.

Examples

This example shows how to configure IGMPv3 report suppression and proxy reporting for VLANs:

switch(config)# ip igmp snooping v3-report-suppression
 

This example shows how to remove IGMPv3 report suppression:

switch(config)# no ip igmp snooping v3-report-suppression
 

 
Related Commands

Command
Description

show ip igmp snooping

Displays IGMP snooping information.

ip igmp snooping v3-report-suppression (VLAN)

To configure IGMPv3 report suppression and proxy reporting for VLANs, use the ip igmp snooping v3-report-suppression command. To remove IGMPv3 report suppression, use the no form of this command.

ip igmp snooping v3-report-suppression

no ip igmp snooping v3-report-suppression

 
Syntax Description

This command has no arguments or keywords.

 
Command Default

Enabled

 
Command Modes

VLAN configuration mode

 
Command History

Release
Modification

5.0(3)N1(1)

This command was introduced.

 
Usage Guidelines

If this setting is disabled for the device, which is the default value, then it is disabled for all VLANs, irrespective of how you set this value for an individual VLAN. However, once you set the global setting to enabled, the settings for all the VLANs are enabled by default.

This command does not require a license.

Examples

This example shows how to configure IGMPv3 report suppression and proxy reporting for specified VLANs:

switch(config)# vlan 10-20
switch(config-vlan)# ip igmp snooping v3-report-suppression
 

This example shows how to remove IGMPv3 report suppression on specified VLANs:

switch(config)# vlan 10-20
switch(config-vlan)# no ip igmp snooping v3-report-suppression
 

 
Related Commands

Command
Description

show ip igmp snooping

Displays IGMP snooping information.