Reference Guide

Internet Group Management Protocol (IGMP)

The IGMP commands are supported by the Dell Networking operating software (FTOS) on the S4820T platform.

This chapter contains the following sections:

• IGMP Commands

• IGMP Snooping Commands

IGMP Commands

FTOS supports IGMPv1/v2/v3 and is compliant with RFC-3376.

Important Points to Remember

• FTOS supports protocol-independent multicast-sparse (PIM-SM) and protocol-independent source-specific

multicast (PIM-SSM) include and exclude modes.

• IGMPv2 is the default version of IGMP on interfaces. You can configure IGMPv3 on interfaces. It is backward

compatible with IGMPv2.

• On the S-Series, the maximum number of interfaces supported 31.

• There is no hard limit on the maximum number of groups supported.

• IGMPv3 router interoperability with IGMPv2 and IGMPv1 routers on the same subnet is not supported.

• An administrative command (ip igmp version) is added to manually set the IGMP version.

• All commands previously used for IGMPv2 are compatible with IGMPv3.

clear ip igmp groups

Clear entries from the group cache table.

S4820T

Syntax

clear ip igmp groups [group-address | interface]

Parameters

group-address

(OPTIONAL) Enter the IP multicast group address in dotted decimal

format.

interface

Enter the following keywords and slot/port or number information:

• For a Port-Channel interface, enter the keyword port-

channel then the slot/port information. The range is from 1

to 128.

• For a VLAN interface, enter the keyword vlan then the slot/

port information. The range is from 1 to 4094.

• For a 10-Gigabit Ethernet interface, enter the keyword

tengigabitethernet then the slot/port information.

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