Dell PowerConnect 6248 User's Guide - Page 739

Last Member Query Interval 1/10 of a second, Querier Expiry Time secs

Page 739 highlights

• Query Interval (secs) - The frequency at which IGMP host-query packets are transmitted on the selected interface. • Query Max Response Time (1/10 of a second) - The maximum query response time advertised in IGMPv2 queries sent from the selected interface. • Robustness - The robustness parameter for the selected interface. This variable allows tuning for the expected packet loss on a subnet. If a subnet is expected to be lossy, the robustness variable may be increased. IGMP is robust to (robustness variable-1) packet losses. • Startup Query Interval (secs) - The interval at which startup queries are sent on the selected interface. • Startup Query Count - The number of queries to be sent on startup. • Last Member Query Interval (1/10 of a second) - The last member query interval is the maximum response time inserted into group-specific queries sent in response to leave group messages, and is also the amount of time between group-specific query messages. This value may be tuned 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 value is not used for IGMP version 1. • Last Member Query Count - The number of queries to be sent on receiving a leave group report. Interface Statistics • Querier - The address of the IGMP querier on the IP subnet to which the selected interface is attached. • Querier Status - Indicates whether the selected interface is in querier or non querier mode. • Querier Up Time (secs) - The time in seconds since the IGMP interface querier was last changed. • Querier Expiry Time (secs) - The time in seconds remaining before the other querier present timer expires. If the local system is the querier, this is zero. • Wrong Version Queries - The number of queries that have been received on the selected interface with an IGMP version that does not match the IGMP version configured for the interface, over the lifetime of the entry. IGMP requires that all routers on a LAN be configured to run the same version of IGMP. Therefore, a configuration error is indicated if any queries are received with the wrong version number. • Number of Joins - The number of times a group membership has been added on the selected interface; that is, the number of times an entry for this interface has been added to the cache table. This gives an indication of the amount of IGMP activity on the interface. • Number of Groups - The current number of entries for the selected interface in the cache table. Displaying the IGMP Routing Configuration Using CLI Commands For information about the CLI command that performs this function, see the following chapter in the CLI Reference Guide: • IGMP Commands The following table summarizes the equivalent CLI commands for this feature. Configuring IP Multicast 739

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Configuring IP Multicast
739
Query Interval (secs)
— The frequency at which IGMP host-query packets are transmitted on the
selected interface.
Query Max Response Time (1/10 of a second)
— The maximum query response time advertised in
IGMPv2 queries sent from the selected interface.
Robustness
— The robustness parameter for the selected interface. This variable allows tuning for the
expected packet loss on a subnet. If a subnet is expected to be lossy, the robustness variable may be
increased. IGMP is robust to (robustness variable-1) packet losses.
Startup Query Interval (secs)
— The interval at which startup queries are sent on the selected
interface.
Startup Query Count
— The number of queries to be sent on startup.
Last Member Query Interval (1/10 of a second)
— The last member query interval is the maximum
response time inserted into group-specific queries sent in response to leave group messages, and is also
the amount of time between group-specific query messages. This value may be tuned 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 value is not used for IGMP version 1.
Last Member Query Count
— The number of queries to be sent on receiving a leave group report.
Interface Statistics
Querier
— The address of the IGMP querier on the IP subnet to which the selected interface is
attached.
Querier Status
— Indicates whether the selected interface is in querier or non querier mode.
Querier Up Time (secs)
— The time in seconds since the IGMP interface querier was last changed.
Querier Expiry Time (secs)
— The time in seconds remaining before the other querier present timer
expires. If the local system is the querier, this is zero.
Wrong Version Queries
— The number of queries that have been received on the selected interface
with an IGMP version that does not match the IGMP version configured for the interface, over the
lifetime of the entry. IGMP requires that all routers on a LAN be configured to run the same version of
IGMP. Therefore, a configuration error is indicated if any queries are received with the wrong version
number.
Number of Joins
— The number of times a group membership has been added on the selected
interface; that is, the number of times an entry for this interface has been added to the cache table.
This gives an indication of the amount of IGMP activity on the interface.
Number of Groups
— The current number of entries for the selected interface in the cache table.
Displaying the IGMP Routing Configuration Using CLI Commands
For information about the CLI command that performs this function, see the following chapter in the
CLI Reference Guide:
IGMP Commands
The following table summarizes the equivalent CLI commands for this feature.