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L
AYER
2 IGMP (S
NOOPING
AND
Q
UERY
)
15-5
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: Disabled)
• IGMP Query Count — Sets the maximum number of queries issued
for which there has been no response before the switch takes action to
drop a client from the multicast group. (Range: 2-10, Default: 2)
• IGMP Query Interval — Sets the frequency at which the switch sends
IGMP host-query messages. (Range: 60-125 seconds, Default: 125)
• IGMP Report Delay — Sets the time 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. (Range:
5-25 seconds, Default: 10)
• IGMP Query Timeout — The time the switch waits after the previous
querier stops before it considers the router port (i.e., the interface which
had been receiving query packets) to have expired. (Range: 300-500
seconds, Default: 300)
• IGMP Version — Sets the protocol version for compatibility with other
devices on the network. (Range: 1-3; Default: 3)
Notes: 1. All systems on the subnet must support the same version.
2. Some attributes are only enabled for IGMPv2 and v3,
including IGMP Report Delay and IGMP Query Timeout.