User manual

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The following parameters may be viewed or modified:
Parameter Description
VLAN ID This is the VLAN ID that, along with the VLAN Name, identifies the VLAN for which to
modify the IGMP Snooping Settings.
VLAN Name This is the VLAN Name that, along with the VLAN ID, identifies the VLAN for which to
modify the IGMP Snooping Settings.
Query Interval This field is used to set the time (in seconds) between transmitting IGMP queries. Entries
between 1 and 65535 seconds are allowed. Default = 125.
Max Response Time This determines the maximum amount of time in seconds allowed before sending an IGMP
response report. This field allows an entry between 1 and 25 (seconds). Default = 10.
Robustness Value Adjust this variable according to expected packet loss. If packet loss on the VLAN is
expected to be high, the Robustness Variable should be increased to accommodate
increased packet loss. This entry field allows an entry of 1 to 255. Default = 2.
Last Member Query
Interval
This field specifies the maximum amount of time between group-specific query messages,
including those sent in response to leave group messages. Default = 1.
Host Timeout This is the maximum amount of time in seconds allowed for a host to continue
membership in a multicast group without the Switch receiving a host membership report.
Default = 260.
Router Timeout
This is the maximum amount of time in seconds that a timer for dynamic router ports, is
kept in the “Browse Router Port” state when a router’s port receives a General Query.
Default = 260.
Leave Timer This specifies the maximum amount of time in seconds between the Switch receiving a
leave group message from a host, and the Switch issuing a group membership query. If no
response to the membership query is received before the Leave Timer expires, the
(multicast) forwarding entry for that host is deleted.
Querier State Choose Enabled to enable transmitting IGMP Query packets or Disabled to disable. The
default is Disabled.
Querier Router
Behavior
This read-only field describes the behavior of the router for sending query packets.
Querier will denote that the router is sending out IGMP query packets. Non-Querier will
denote that the router is not sending out IGMP query packets. This field will only read
Querier when the Querier State and the State fields have been Enabled.
State Select Enabled to implement IGMP Snooping. This field is Disabled by default.
Multicast Fast Leave This parameter allows the user to enable the Fast Leave function. Enabled, this function
will allow members of a multicast group to leave the group immediately (without the
implementation of the Last Member Query Timer) when an IGMP Leave Report Packet is
received by the Switch. The default is Disabled.
Click Apply to implement the new settings. Click the Show All IGMP Snooping Entries link to return to the Current
IGMP Snooping Group Entries window.
NOTE: The Fast Leave function is intended for IGMPv2 users wishing to
leave a multicast group and is best implemented on VLANs that have
only one host connected to each port. When one host of a group of hosts
uses the Fast Leave function, it may cause the inadvertent fast leave of
other hosts of the group.