Show Ip Igmp Groups; Adjusting Timers; Adjusting Query And Response Timers; Show Ip Igmp Interface - Dell Force10 Z9000 Configuration Manual

• View both learned and statically configured IGMP groups.
EXEC Privilege mode

show ip igmp groups

Example of the show ip igmp groups Command
Dell# show ip igmp groups
Total Number of Groups: 2
IGMP Connected Group Membership
Group Address Interface
225.1.1.1 TenGigabitEthernet 1/1
225.1.2.1 TenGigabitEthernet 1/1

Adjusting Timers

The following sections describe viewing and adjusting timers.
To view the current value of all IGMP timers, use the following command.
• View the current value of all IGMP timers.
EXEC Privilege mode

show ip igmp interface

For more information, refer to the example shown in

Adjusting Query and Response Timers

The querier periodically sends a general query to discover which multicast groups are active. A group must have at least one host to
be active.
When a host receives a query, it does not respond immediately, but rather starts a delay timer. The delay time is set to a random
value between 0 and the maximum response time. The host sends a response when the timer expires; in version 2, if another host
responds before the timer expires, the timer is nullified, and no response is sent.
The maximum response time is the amount of time that the querier waits for a response to a query before taking further action. The
querier advertises this value in the query (refer to the illustration in
increases response burstiness because all host membership reports must be sent before the maximum response time expires.
Inversely, increasing this value decreases burstiness at the expense of leave latency.
When the querier receives a leave message from a host, it sends a group-specific query to the subnet. If no response is received, it
sends another. The amount of time that the querier waits to receive a response to the initial query before sending a second one is
the last member query interval (LMQI). The switch waits one LMQI after the second query before removing the group from the
state table.
• Adjust the period between queries.
INTERFACE mode
ip igmp query-interval
• Adjust the maximum response time.
INTERFACE mode
ip igmp query-max-resp-time
• Adjust the last member query interval.
INTERFACE mode
ip igmp last-member-query-interval
Mode Uptime
IGMPV2 00:11:19
IGMPV2 00:10:19
Viewing IGMP Enabled Interfaces.
IGMP Version
Expires Last Reporter
00:01:50 165.87.34.100
00:01:50 165.87.31.100
2). Lowering this value decreases leave latency but
Internet Group Management Protocol (IGMP)
265