331
ip multicast dvmrp
Layer 2
Switching
Modules
✓
Multilayer
Switching
Modules
tunnels summary
Summaries key information about DVMRP tunnel end points that are
configured on a Multilayer Switching Module.
Valid Minimum Abbreviation
ip m d t s
Important Considerations
■
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.
■
The index number shown in the DVMRP tunnel summary display is the
tunnel index number. When you define a DVMRP tunnel, the module
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 module 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 module assigns tunnel index 2 to the next
new
tunnel
that you define. After 2 is used, the module 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. If you see two or more identical IP addresses in the
Local
Address
column of the display, verify that the IP addresses in the
Remote Address
column are different.
Summary of Contents for 4007
Page 1: ...http www 3com com Switch 4007 Command Reference Guide Part No 10013693 Published May 2000...
Page 14: ......
Page 22: ...22 ABOUT THIS GUIDE...
Page 34: ...34 CHAPTER 1 ADMINISTRATION OVERVIEW...
Page 78: ...78 CHAPTER 4 SIMPLE NETWORK MANAGEMENT PROTOCOL SNMP...
Page 100: ...100 CHAPTER 5 ETHERNET PORTS...
Page 174: ...174 CHAPTER 9 RESILIENT LINKS...
Page 322: ...322 CHAPTER 13 VIRTUAL ROUTER REDUNDANCY VRRP...
Page 476: ...476 CHAPTER 16 INTERNET PACKET EXCHANGE IPX...
Page 552: ...552 CHAPTER 18 QUALITY OF SERVICE QOS AND RESOURCE RESERVATION PROTOCOL RSVP...
Page 566: ...566 APPENDIX A TECHNICAL SUPPORT...