D-Link xStack, Руководство пользователя

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xStack
®
DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch
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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. The default setting is
2 seconds.
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.
Fast Leave The Fast Leave option may be Enabled or Disabled (default). This allows an
interface to be pruned without sending group-specific queries.
Report Suppression Select Enabled or Disabled for IGMP Snooping report suppression for specified
VLANs. When IGMP report suppression is Enabled , only changes of group state and
query messages will trigger the Switch to send reports to the router. This feature
prevents duplicate reports from being sent to multicast devices. When
Disabled , all
IGMP reports are forwarded to multicast routers.
Click Apply to implement the new settings. Click the Show All IGMP Snooping Entries link to return to the IGMP Snooping
Settings window.
Router Port 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.
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.
To view this window click L2 Features > IGMP Snooping > Router Port Settings , as shown below:
Figure 3 - 27 Router Port Settings window
This window 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 Router Port window, as shown below.