D-Link DES-3828 - xStack Switch - Stackable Uživatelský manuál Strana 102

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xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch
86
membership in a multicast group without the Switch receiving a host membership
report. Default = 260.
Route 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.
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 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 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 7- 16. Current Static Router Ports Entries window
The Current Static Router Ports Entries 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 Static Router
Ports Settings window, as shown below.
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