ip multicast dvmrp tunnels summary 509
ip multicast dvmrp
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✓ 9000
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tunnels summary
For CoreBuilder 9000: Applies to Layer 3 switching modules only.
Summaries key information about DVMRP tunne ls that you have
configured in your system. Tunnels enable IP multicast spanning trees to
be constructed through and beyond areas of the ne twork (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 syste m
assigns a tunnel index number to it, w hich is different from th e
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 dy namically re-order
remaining tunnels in the DVMRP tunnel summary d isplay. For
example, if you had three tunnels with tunnel ind ex numbers 1, 2, and
3 and you then removed tunnel 2, the display lists t he remaining
tunnels with their original tunnel index num bers (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 di fferent remote
interface. You cannot define m ultiple IP multicast tu nnels between the
same two end points (interfaces).