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DES-3326 Layer 3 Fast Ethernet Switch User’s Guide
Static 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
the 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, PIM-DM multicast packets are detected flowing into a port.
To setup a static router port, highlight Static Router Port Settings from the Multicasting Menu and
press Enter.
Figure 6-53. Setup Static Router Port screen
Parameter Description
Action:
<Add/Modify>
This field can be toggled between Add/Modify and Delete
using the space bar. To add a port to the static router port
table, select Add/Modify and enter the VID of the VLAN the
router port will belong to. Delete allows for the deletion of a
previously made entry.
Router Port (M/-):
[ ][ ][ ]
Each port can be set individually as a router port by
highlighting the port’s entry using the arrow keys, and then
toggling between M and – using the space bar. M indicates a
port is a member of the static group of router ports. –
indicates a port is not a static member.
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