ip multicast dvmrp tunnels summary 509

ip multicast dvmrp tunnels summary

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For CoreBuilder 9000: Applies to Layer 3 switching modules only.

Summaries key information about DVMRP tunnels that you have configured in your system. Tunnels enable IP multicast spanning trees to be constructed through and beyond areas of the network (routers) that do not support IP multicast routing. The two tunnel end points must lie in different systems and subnetworks.

Valid Minimum Abbreviation

ip m d t s

Important Considerations

The index number shown in the DVMRP tunnel summary display is the tunnel index number. When you define a DVMRP tunnel, the system assigns a tunnel index number to it, which is different from the routing interface index number. Tunnel index numbers provide a way to identify individual tunnels, which is necessary because multiple tunnel end points can be configured on the same routing interface. Tunnel index numbers are also needed so that you can remove tunnels without removing the interface with which it is associated.

When you remove a tunnel, the system does not dynamically re-order remaining tunnels in the DVMRP tunnel summary display. For example, if you had three tunnels with tunnel index numbers 1, 2, and 3 and you then removed tunnel 2, the display lists the remaining tunnels with their original tunnel index numbers (1 and 3, in this example). The system assigns tunnel index 2 to the next new tunnel that you define. After 2 is used, the system can assign tunnel index 4 for the next new tunnel, and so on.

You can define multiple IP multicast tunnel end points on the same local routing interface, but each must lead to a different remote interface. You cannot define multiple IP multicast tunnels between the same two end points (interfaces).

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3Com 3500 manual Ip multicast dvmrp tunnels summary