Ip Multicast Dvmrp Tunnels Summary - 3Com SuperStack II 9300 Command Reference Manual

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).

ip multicast dvmrp tunnels summary

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