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C H A P T E R  2
Feedback IGMP

IGMP is a protocol used by IP hosts to inform adjacent routers about multicast group membership. The SEFOS implementation of IGMP conforms to RFC 3376 for IGMP v3 router functionality and supports the MIBs defined in the Internet Draft draft-ietfmagma-rfc2933-update-00.txt.

The deployment of the IGMP router can be within a routing domain that uses any MRP. IGMP informs MRPs about group membership messages and leave messages.

2.1 IGMP Commands

The list of CLI commands for the configuration of IGMP is as follows:

2.1.1 set ip igmp

Enables or disables IGMP globally or on a particular interface. 


set ip igmp {enable | disable}


Syntax Description

enable - Enables IGMP.

disable - Disables IGMP.

Mode

Global Configuration and Interface Configuration

Note - Interface Configuration mode is applicable only in VLAN Interface.

Defaults

Disabled.

Example

SEFOS(config)# interface vlan 2

 

SEFOS(config-if)# set ip igmp enable


Related Commands

2.1.2 ip igmp immediate-leave

Enables immediate leave processing on the interface and the no form of the command disables immediate-leave processing. 


ip igmp immediate-leave



no ip igmp immediate-leave


Mode

Interface Configuration

Applicable only in VLAN Interface.

Defaults

Disabled.

Example

SEFOS(config-if)# ip igmp immediate-leave


Related Commands

2.1.3 ip igmp version

Sets the IGMP version on the interface. The no form of the command sets the default IGMP version on the interface. 


ip igmp version {1 | 2 | 3}



no ip igmp version


Syntax Description

1 | 2 | 3 - IGMP versions.

Mode

Interface Configuration

Applicable only in VLAN Interface.

Defaults

2

Example

SEFOS(config-if)# ip igmp version 1


Related Commands

2.1.4 ip igmp query-interval

Sets the IGMP query interval for the interface and the no form of the command sets query-interval to the default value. 


ip igmp query-interval seconds_1-65535



no ip igmp query-interval


Mode

Interface Configuration

Applicable only in VLAN Interface.

Defaults

125

Example

SEFOS(config-if)# ip igmp query-interval 30


Related Commands

2.1.5 ip igmp query-max-response-time

Sets the IGMP max query response value for the interface. The no form of the command sets the max query response to the default value. 


ip igmp query-max-response-time seconds_1-255



no ip igmp query-max-response-time


Mode

Interface Configuration

Applicable only in VLAN Interface.

Defaults

100

Example

SEFOS(config-if)# ip igmp query-max-response-time 20


Related Commands

2.1.6 ip igmp robustness

Sets the IGMP robustness value for the interface. The no form of the command sets the robustness value to default value. 


ip igmp robustness 1-255



no ip igmp robustness


Mode

Interface Configuration

Applicable only in VLAN Interface.

Defaults

2

Example

SEFOS(config-if)# ip igmp robustness 100


Related Commands

2.1.7 ip igmp last-member-query-interval

Sets the IGMP last member query interval for the interface. The no form of the command sets the last member query interval to the default value. 


ip igmp last-member-query-interval 1-255



no ip igmp last-member-query-interval


Mode

Interface Configuration

Applicable only in VLAN Interface.

Defaults

10

Example

SEFOS(config-if)# ip igmp last-member-query-interval 100

Notes

The igmp on this interface must be set to version 2 or 3. For example:

SEFOS(config-if)# ip igmp version 1

SEFOS(config-if)# ip igmp last-member-query-interval 100

% CLI Command Failed

SEFOS(config-if)# ip igmp version 2

SEFOS(config-if)# ip igmp last-member-query-interval 10

SEFOS(config-if)# ip igmp version 3

SEFOS(config-if)# ip igmp last-member-query-interval 100


Related Commands

2.1.8 ip igmp static-group

Adds the static group membership on the interface. The no form of the command deletes the static group membership on the interface. 


ip igmp static-group group-address [source source-address]



no ip igmp static-group group-address [source source-address]


Syntax Description

group-address - Group IP address

source-address - Source IP address

Mode

Interface Configuration

Applicable only in VLAN Interface.

Example

SEFOS(config-if)# ip igmp static-group 224.1.2.3 source 12.0.0.1

Notes

The igmp version on this interface must be set to 3 for configuring static group along with source information.


Related Commands

2.1.9 no ip igmp

Deletes the IGMP capable interface. 


no ip igmp


Mode

Interface Configuration

Applicable only in VLAN Interface.

Example

SEFOS(config-if)# no ip igmp

Notes

At least one of the interface configuration commands must have been executed to create the IGMP interface. If not, the following error message is displayed:

% Interface Entry not found

For example:

SEFOS(config)# int vlan 3

SEFOS(config-if)# no ip igmp

% Interface Entry not found

SEFOS(config-if)#


Related Commands

2.1.10 debug ip igmp

Enables the IGMP trace. The no form of the command disables the IGMP trace. 


debug ip igmp {[i/o] [grp] [qry] [tmr] [mgmt] | [all]}



no debug ip igmp {[i/o] [grp] [qry] [tmr] [mgmt] | [all]}


Syntax Description

i/o - Input/output messages.

grp - Group related messages.

qry - Query related messages.

tmr - Timer related messages.

mgmt - Management configuration messages.

all - All traces.

Mode

Privileged EXEC

Defaults

Disabled.

Example

SEFOS# debug ip igmp all


2.1.11 show ip igmp global-config

Displays the global configuration of IGMP. 


show ip igmp global-config


Mode

Privileged EXEC

Example

SEFOS# show ip igmp global-config

 

IGMP is globally enabled


Related Commands

2.1.12 show ip igmp interface

Displays the interface configuration of IGMP. 


show ip igmp interface [{Vlan vlan-id | interface-type interface-id}]


Syntax Description

Vlan - VLAN identifier.

interface-type - Interface type.

interface-id - Interface identifier.

Mode

Privileged EXEC

Example

SEFOS# show ip igmp interface

 

vlan1, line protocol is up

Internet Address is 10.0.0.1/8

IGMP is enabled on interface

Current IGMP router version is 2

IGMP query interval is 125 seconds

Last member query response interval is 10 seconds

IGMP max query response time is 100 seconds

Robustness value is 2

IGMP querying router is 10.0.0.1 (this system)

Fast leave is disabled on this interface

 

No multicast groups joined

 

vlan2, line protocol is up

Internet Address is 20.0.0.1/8

IGMP is enabled on interface

Current IGMP router version is 2

IGMP query interval is 125 seconds

Last member query response interval is 10 seconds

IGMP max query response time is 100 seconds

Robustness value is 2

IGMP querying router is 20.0.0.1 (this system)

Fast leave is disabled on this interface

No multicast groups joined


Related Commands

2.1.13 show ip igmp groups

Displays the IGMP groups information. 


show ip igmp groups


Mode

Privileged EXEC

Example

SEFOS# show ip igmp groups

 

I - Include Mode, E - Exclude Mode

S - Static Mbr, D - Dynamic Mbr

 

GroupAddress Flg Iface UpTime ExpiryTime LastReporter

------------ ---------- ------ ----------- -------------

224.5.5.5 S vlan2 [0d 00:00:22.28] [0d 00:00:00.00] 20.0.0.1

226.7.7.7 IS vlan3 [0d 00:00:04.59] [0d 00:00:00.00] 30.0.0.1


Related Commands

2.1.14 show ip igmp sources

Displays the IGMP source information. 


show ip igmp sources


Mode

Privileged EXEC

Example

SEFOS# show ip igmp sources

 

I - Include Mode, E - Exclude Mode

S - Static Mbr, D - Dynamic Mbr

F - Forward List, N - Non-Forward List

 

GroupAddress Iface SrcAddress Flg ExpiryTime LastReporter

------------ ----- ---------- --- ---------- ------------

226.7.7.7 vlan3 12.0.0.1 ISF [0d 00:00:00.00] 30.0.0.1


Related Commands

2.1.15 show ip igmp statistics

Displays the IGMP statistics information. 


show ip igmp statistics [{Vlan vlan-id | interface-type interface-id}]


Mode

Privileged EXEC

Example

SEFOS# show ip igmp statistics

 

IGMP Statistics for vlan1

Number of General queries received 1

Number of Group Specific queries received 0

Number of Group and Source Specific queries received 0

Number of v1/v2 reports received 0

Number of v3 reports received 8

Number of v2 leaves received 0

Number of General queries transmitted 1

Number of Group Specific queries transmitted 1

Number of Group and Source Specific queries transmitted 2

 

IGMP Statistics for vlan3

Number of General queries received 0

Number of Group Specific queries received 0

Number of Group and Source Specific queries received 0

Number of v1/v2 reports received 0

Number of v3 reports received 6

Number of v2 leaves received 0

Number of General queries transmitted 1

Number of Group Specific queries transmitted 0

Number of Group and Source Specific queries transmitted 0


 

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