D-Link DES-3250TG User Manual - page 55

D-Link DES-3250TG Standalone Layer 2 Switch

group messages.  The default is 1 second. 

Host Timeout (1-

16711450) 

Specifies the maximum amount of time a 

host can be a member of a multicast group 

without the switch receiving a host 

membership report.  The default is 260 

seconds. 

Router Timeout (1-

16711450) 

Specifies the maximum amount of time a 

route will remain in the switch’s forwarding 

table without receiving a membership 

report. The default is 260 seconds. 

Leave Timer (1-

16711450) 

Specifies the maximum amount of time 

between the switch receiving a leave group 

message from a host, and the switch 

issuing a group membership query. If the 

switch does not receive a response from 

the group membership query before the 

Leave Timer expires, the forwarding table 

entry for the multicast address is deleted 

from the switch’s forwarding table. The 

default is 2 seconds. 

Querier State 

This field can be switched using the pull-

down menu between Disabledand 

Enabled.  

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  

This field can be switched using the pull-

down menu between Disabledand 

Enabled. This is used to enable or disable 

IGMP Snooping for the specified VLAN. 

Static Router Ports Entry 

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. 

•  All UDP multicast packets will be forwarded to the router port. Because routers do not send IGMP reports or 

implement IGMP snooping, a multicast router connected to the router port of the Layer 2 switch would not be able to 

receive UDP data streams unless the UDP multicast packets were all forwarded to the router port. 

Click Static Router Ports Entry under the IGMP folder on the Configuration menu: 

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