Determine the Protocol Configured on the Added VLAN

Use this procedure to determine the protocol configured on the added VLAN.

The protocol configured on the added VLAN can be one of the following values:

  • snoop

  • snoop-spb

  • route-spb

  • pim

Procedure

  1. Enter Privileged EXEC mode:

    enable

  2. Determine the protocol configured on the added VLAN:

    show ip igmp interface [gigabitethernet {slot/port[/sub-port][-slot/port[/sub-port]][,...]}][vlan <1-4059>][vrf WORD<1–16>] [vrfids WORD<0–512>]

    The protocol displays under the Mode column of the command output.

Example

Determine the protocol configured on the added VLAN:

Switch:1#show ip igmp interface

=========================================================================================
                         Igmp Interface - GlobalRouter
=========================================================================================
       QUERY              OPER            QUERY   WRONG              LASTMEM
IF     INTVL STATUS VERS. VERS QUERIER    MAXRSPT QUERY JOINS ROBUST QUERY   MODE   L2ISID
-----------------------------------------------------------------------------------------
V100   125    activ  2     2   0.0.0.0    100     0     0     2      10      snoop-spb 1100 

1 out of 1 entries displayed

Variable Definitions

The following table defines parameters for the show ip igmp interface command.

Variable

Value

gigabitethernet{slot/port[/sub-port] [-slot/port[/sub-port]] [,...]}

Identifies the slot and port in one of the following formats: a single slot and port (slot/port), a range of slots and ports (slot/port-slot/port), or a series of slots and ports (slot/port,slot/port,slot/port). If the platform supports channelization and the port is channelized, you must also specify the sub-port in the format slot/port/sub-port.

vlan<1-4059>

Specifies the VLAN ID in the range of 1 to 4059. By default, VLAN IDs 1 to 4059 are configurable and the system reserves VLAN IDs 4060 to 4094 for internal use. On switches that support the vrf-scaling and spbm-config-mode boot configuration flags, if you enable these flags, the system also reserves VLAN IDs 3500 to 3998. VLAN ID 1 is the default VLAN and you cannot create or delete VLAN ID 1.

vrfWORD<1–16>

Specifies the VRF instance by the VRF name.

vrfidsWORD<0–512>

Specifies the VRF ID for which to display statistics.

Job Aid

The following table shows the field descriptions for the show ip igmp interface command.

Field

Description

IF

Indicates the interfaces where IGMP is configured.

QUERY INTVL

Indicates the frequency at which the interface transmits IGMP host query packets.

STATUS

Indicates the activation of a row that enables IGMP on the interface. The destruction of a row disables IGMP on the interface.

VERS

Indicates the version of IGMP that runs on this interface. This object configures a router capable of running either version. For IGMP to function correctly, you must configure all routers on a LAN to run the same version of IGMP.

OPER VERS

Indicates the operational version of IGMP.

QUERIER

Indicates the address of the IGMP querier on the IP subnet to which this interface is attached.

QUERY MAXRSPT

Indicates the maximum query response time (in tenths of a second) advertised in IGMPv2 queries on this interface.

WRONG QUERY

Indicates the number of queries received whose IGMP version does not match the IGMP Interface version. You must configure all routers on a LAN to run the same version of IGMP. Therefore, if the interface receives queries with the wrong version, a configuration error occurs.

JOINS

Indicates the number of times IGMP added a group membership on this interface.

ROBUST

Indicates the robustness variable, which you configure for the expected packet loss on a subnet. If packet loss is expected on a subnet, increase the robustness variable.

LAST MEM QUERY

Indicates the maximum response time (in tenths of a second) inserted into group-specific queries sent in response to leave group messages, and is also the amount of time between group-specific query messages. Use this value to modify the leave latency of the network. A reduced value results in reduced time to detect the loss of the last member of a group. This does not apply if igmpInterface version is 1.

MODE

Indicates the protocol configured on the VLAN added.

  • snoop — Indicates IGMP snooping is enabled on a VLAN.

  • snoop-spb — Indicates IGMP is enabled on a VLAN with an associated I-SID (IP Multicast over Fabric Connect for a Layer 2 VSN.)

  • routed-spb — Indicates IP Multicast over Fabric Connect is enabled on the Layer 3 VSN or for IP Shortcuts.

  • pim — Indicates PIM is enabled.

The following table shows the field descriptions for the show ip igmp interface command output if you use the optional parameters to specify a port, VLAN, or VRF.

Table 1. show ip igmp interface command with optional parameters

Field

Description

VLAN ID or PORT NUM

Identifies the VLAN or port where IGMP is configured.

QUERY INTVL

Indicates the frequency at which IGMP host query packets transmit on this interface.

QUERY MAX RESP

Indicates the maximum query response time (in tenths of a second) advertised in IGMPv2 queries on this interface.

ROBUST

Indicates the robustness variable, which you can configure for the expected packet loss on a subnet. If you expect packet loss on a subnet, increase the robustness variable.

VERSION

Indicates the version of IGMP that runs on this interface. This object configures a router capable of running either version. For IGMP to function correctly, you must configure all routers on a LAN to run the same version of IGMP.

LAST MEMB QUERY

Indicates the maximum response time (in tenths of a second) inserted into group-specific queries sent in response to leave group messages, and is also the amount of time between group-specific query messages. Use this value to modify the leave latency of the network. A reduced value results in reduced time to detect the loss of the last member of a group. This variable does not apply to IGMPv1.

PROXY SNOOP ENABLE

Indicates if proxy snoop is enabled on the interface.

SNOOP ENABLE

Indicates if snoop is enabled on the interface.

SSM SNOOP ENABLE

Indicates if SSM snoop is enabled on the interface.

FAST LEAVE ENABLE

Indicates if fast leave mode is enabled on the interface.

FAST LEAVE PORTS (VLAN parameter only)

Indicates the set of ports that are enabled for fast leave.

VLAN ID or PORT NUM

Identifies the VLAN or port where IGMP is configured.

SNOOP QUERIER ENABLE (VLAN parameter only)

Indicates if the IGMP Layer 2 Querier feature is enabled.

SNOOP QUERIER ADDRESS (VLAN parameter only)

Indicates the IP address of the IGMP Layer 2 Querier.

DYNAMIC DOWNGRADE VERSION

Indicates if the dynamic downgrade feature is enabled.

COMPATIBILITY MODE

Indicates if compatibility mode is enabled.

EXPLICIT HOST TRACKING

Indicates if explicit host tracking is enabled to track all the source and group members.
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