DES-3028 DES-3028P DES-3052 DES-3052P Layer 2 Fast Ethernet Managed Switch
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 a route is kept in the forwarding table
without receiving a membership report. 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.
Static Router Ports Settings
A static router port is a port that has a multicast router attached to it. Generally, this router would have a connection to a WAN or
to the Internet. Establishing a router port will allow multicast packets coming from the router to be propagated through the
network, as well as allowing multicast messages (IGMP) coming from the network to be propagated to the router.
A router port has the following behavior:
All IGMP Report packets will be forwarded to the router port. •
• IGMP queries (from the router port) will be flooded to all ports.
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