Responding To Mrinfo Requests; Configuring Advanced Dvmrp Interoperability Features - Cisco WS-C3750-48PS-S Software Configuration Manual

Configuring Advanced DVMRP Interoperability Features

Command
Step 4 end
Step 5
show running-config
Step 6 copy running-config startup-config
To prevent the default route advertisement, use the no ip dvmrp default-information interface
configuration command.

Responding to mrinfo Requests

The software answers mrinfo requests sent by mrouted systems and Cisco routers and multilayer
switches. The software returns information about neighbors through DVMRP tunnels and all the routed
interfaces. This information includes the metric (always set to 1), the configured TTL threshold, the
status of the interface, and various flags. You can also use the mrinfo privileged EXEC command to
query the router or switch itself, as in this example:
Switch# mrinfo
171.69.214.27 (mm1-7kd.cisco.com) [version cisco 11.1] [flags: PMS]:
171.69.214.27 -> 171.69.214.26 (mm1-r7kb.cisco.com) [1/0/pim/querier]
171.69.214.27 -> 171.69.214.25 (mm1-45a.cisco.com) [1/0/pim/querier]
171.69.214.33 -> 171.69.214.34 (mm1-45c.cisco.com) [1/0/pim]
171.69.214.137 -> 0.0.0.0 [1/0/pim/querier/down/leaf]
171.69.214.203 -> 0.0.0.0 [1/0/pim/querier/down/leaf]
171.69.214.18 -> 171.69.214.20 (mm1-45e.cisco.com) [1/0/pim]
171.69.214.18 -> 171.69.214.19 (mm1-45c.cisco.com) [1/0/pim]
171.69.214.18 -> 171.69.214.17 (mm1-45a.cisco.com) [1/0/pim]
Configuring Advanced DVMRP Interoperability Features
Cisco routers and multilayer switches run PIM to forward multicast packets to receivers and receive
multicast packets from senders. It is also possible to propagate DVMRP routes into and through a PIM
cloud. PIM uses this information; however, Cisco routers and multilayer switches do not implement
DVMRP to forward multicast packets.
These sections describe how to perform advanced optional configuration tasks on your switch to
interoperate with DVMRP devices:
•
•
•
For information on basic DVMRP features, see the
Features" section on page
Catalyst 3750 Switch Software Configuration Guide
36-42
Purpose
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Enabling DVMRP Unicast Routing, page 36-43
Rejecting a DVMRP Nonpruning Neighbor, page 36-43
Controlling Route Exchanges, page 36-46
36-37.
Chapter 36
(optional)
(optional)
(optional)
"Configuring Basic DVMRP Interoperability
Configuring IP Multicast Routing
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