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DES-3550 Fast Ethernet Layer 2 Switch
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.
State
Select Enabled to implement IGMP Snooping. This field is Disabled by default.
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.
Static Router Ports
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. •
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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 a Layer 3 switch would not be able
to receive UDP data streams unless the UDP multicast packets were all forwarded to the router port.
A router port will be dynamically configured when IGMP query packets, RIPv2 multicast, DVMRP multicast or PIM-DM
multicast packets are detected flowing into a port.
Open the IGMP folder and the click on the Static Router Ports Entry link to open the Current Static Router Ports
Entries page, as shown below.
Figure 6- 16. Current Static Router Ports Entries window
The Current Static Router Ports Entries page (shown above) displays all of the current entries to the Switch's static
router port table. To modify an entry, click the Modify button. This will open the Static Router Ports Settings page, as
shown below.
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