Examples: The following command displays IGMP statistics for VLAN orange:

DWS-1008#show igmp statistics vlan orange

IGMP statistics for vlan orange:

 

IGMP message type

Received Transmitted Dropped

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

General-Queries

0

0

0

GS-Queries

0

0

0

Report V1

0

0

0

Report V2

5

1

4

Leave

0

0

0

Mrouter-Adv

0

0

0

Mrouter-Term

0

0

0

Mrouter-Sol

50

101

0

DVMRP

4

4

0

PIM V1

0

0

0

PIM V2

0

0

0

Topology notifications: 0

 

 

 

Packets with unknown IGMP type: 0

Packets with bad length: 0

Packets with bad checksum: 0

Packets dropped: 4

The table below describes the fields in this display.

Field

Description

IGMP statistics for vlan

VLAN name. Statistics are listed separately for each VLAN.

 

Type of IGMP message:

 

General-Queries—General group membership queries sent by the multicast querier (multicast

 

router or pseudo-querier).

 

GS-Queries—Group-specific queries sent by the the multicast querier to determine whether

 

there are receivers for a specific group.

 

• Report V1—IGMP version 1 group membership reports sent by clients who want to be

IGMP message type

receivers for the groups.

 

• Report V2—IGMP version 2 group membership reports sent by clients who want to be

 

receivers for the groups.

 

Leave—IGMP version 2 leave messages sent by clients who want to stop receiving traffic for

 

a group. Leave messages apply only to IGMP version 2.

 

Mrouter-Adv—Multicast router advertisement packets. A multicast router sends this type of

 

packet to advertise the IP address of the sending interface as a multicast router interface.

 

Type of IGMP message, continued:

 

Mrouter-Term—Multicast router termination messages. A multicast router sends this type of

 

message when multicast forwarding is disabled on the router interface, the router interface

 

is administratively disabled, or the router itself is gracefully shutdown.

 

Mrouter-Sol—Multicast router solicitation messages. A multicast client or a switch sends this

IGMP message type

type of message to immediately solicit multicast router advertisement messages from the

multicast routers in the subnet.

 

 

DVMRP—Distance Vector Multicast Routing Protocol (DVMRP) messages. Multicast routers

 

running DVMRP exchange multicast information with these messages.

 

• PIM V1—Protocol Independent Multicast (PIM) version 1 messages. Multicast routers running

 

PIMv1 exchange multicast information with these messages.

 

• PIM V2—PIM version 2 messages.

 

 

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