UMN:CLI
User Manual
V8102
496
sion since the number of reports would be generally equal to the number of hosts only.
10.2.3.5
IGMP Snooping S-Query Report Agency
If IGMP snooping switch receives IGMP group-specific query messages from the mul-
ticast router, it just floods them into all of its ports. The hosts received the group-specific
queries send the report messages according to their IGMP membership status. However,
V8102 is enabled as IGMP snooping S-Query report agency, the group-specific queries
are not sent downstream. When the switch receives a group-specific query, the switch
terminates the query and sends an IGMP report if there is a receiver for the group.
To enable IGMP snooping S-Query Report Agency, use the following command.
Command
Mode
Description
ip
igmp
snooping
s-query-
report-agency
Global
Enables IGMP snooping s-query-report agency.
To disable IGMP snooping S-Query Report Agency, use the following command.
Command
Mode
Description
no ip igmp snooping s-query-
report-agency
Global
Disables IGMP snooping s-query-report agency.
10.2.3.6
Explicit Host Tracking
Explicit host tracking is one of the important IGMP snooping features. It has the ability to
build the explicit tracking database by collecting the host information via the membership
reports sent by hosts. This database is used for the immediate leave for IGMPv2 hosts,
the immediate block for IGMPv3 hosts, and IGMP statistics collection.
To enable explicit host tracking, use the following command.
Command
Mode
Description
ip
igmp
snooping
explicit-
tracking
Global
Enables explicit host tracking globally.
ip
igmp
snooping
explicit-
tracking s-query-suppression
Enables IGMP group specific query suppression under
explicit host tracking
To disable explicit host tracking, use the following command.
Command
Mode
Description
no ip igmp snooping explicit-
tracking
Global
Disables explicit host tracking globally.
ip
igmp
snooping
explicit-
tracking s-query-suppression
Disables IGMP group specific query suppression under
explicit host tracking
You can also restrict the number of hosts on a port for the switch performance and en-