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DES-3010F/DES-3010FL/DES-3010G/DES-3016/DES-3018/DES-3026 Fast Ethernet Switch Manual
98
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
(1-65535)
The Query Interval 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
(1-25)
This determines the maximum amount of time in seconds allowed before sending an IGMP
response report. The Max Response Time field allows an entry between 1 and 25
(seconds). Default = 10.
Robustness Value
(1-255)
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 (1-25)
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
(1-16711450)
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
(1-16711450)
This is the maximum amount of time in seconds a route is kept in the forwarding table
without receiving a membership report. Default = 260.
Leave Timer
(1-16711450)
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 Group 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.