Responding To Mrinfo Requests; Configuring Advanced Dvmrp Interoperability Features; Enabling Dvmrp Unicast Routing - Cisco Catalyst 3560-X 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 contain this configuration information:
•
•
•
For information on basic DVMRP features, see the
Features" section on page

Enabling DVMRP Unicast Routing

Because multicast routing and unicast routing require separate topologies, PIM must follow the
multicast topology to build loopless distribution trees. Using DVMRP unicast routing, Cisco routers,
multilayer switches, and mrouted-based machines exchange DVMRP unicast routes, to which PIM can
then reverse-path forward.
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
1-54
Purpose
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Enabling DVMRP Unicast Routing, page 1-54
Rejecting a DVMRP Nonpruning Neighbor, page 1-55
Controlling Route Exchanges, page 1-58
1-49.
Chapter 1
(optional)
(optional)
(optional)
"Configuring Basic DVMRP Interoperability
Configuring IP Multicast Routing
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