SMC Networks SMC TigerStack III SMC6824MPE - Manual (Page 250)

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ONFIGURING THE
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WITCH
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• IGMP Querier – A router, or multicast-enabled switch, can
periodically ask their hosts if they want to receive multicast traffic. If
there is more than one router/switch on the LAN performing IP
multicasting, one of these devices is elected “querier” and assumes the
role of querying the LAN for group members. It then propagates the
service requests on to any adjacent multicast switch/router to ensure
that it will continue to receive the multicast service.
Note: Multicast routers use this information, along with a multicast
routing protocol such as DVMRP or PIM, to support IP
multicasting across the Internet.
Command Attributes
• IGMP Status — When enabled, the switch will monitor network
traffic to determine which hosts want to receive multicast traffic. This
is also referred to as IGMP Snooping. (Default: Enabled)
• Act as IGMP Querier — When enabled, the switch can serve as the
Querier, which is responsible for asking hosts if they want to receive
multicast traffic. (Default: Enabled)
• IGMP Query Count — Sets the maximum number of queries issued
for which there has been no response before the switch takes action to
solicit reports. (Default: 2, Range: 2 - 10)
• IGMP Query Interval — Sets the frequency of time at which the
switch sends IGMP host-query messages. (Default: 125 secs., Range:
60 - 125 secs.)
• IGMP Report Delay — Sets the time (in seconds) between receiving
an IGMP Report for an IP multicast address on a port before the
switch sends an IGMP Query out of that port and removes the entry
from its list. (Default: 10, Range: 5-30)
• Query Timeout — Sets the time (in seconds) the switch waits after
the previous querier has stopped querying before it takes over as the
querier. (Default: 300 seconds, Range: 300 - 500)
• IGMP Version — Sets the protocol version for compatibility with
other devices on the network. (Default: 2, Range: 1 - 2)
Notes: 1. All systems on the subnet must support the same version.
2. Some attributes are only enabled for IGMPv2, including
IGMP Report Delay and IGMP Query Timeout.