Responding To Mrinfo Requests - Cisco Catalyst 3550 series Software Configuration Manual

Chapter 34 Configuring IP Multicast Routing
Command
Step 3 ip dvmrp default-information
{originate | only}
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 {originate | only}
interface configuration command.

Responding to mrinfo Requests

The Cisco IOS 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]
78-11194-09
Purpose
Advertise network 0.0.0.0 to DVMRP neighbors.
Use this command only when the multilayer switch is a neighbor of
mrouted version 3.6 machines.
The keywords have these meanings:
• originate—Specifies that other routes more specific than 0.0.0.0 can
also be advertised.
• only—Specifies that no DVMRP routes other than 0.0.0.0 are
advertised.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Catalyst 3550 Multilayer Switch Software Configuration Guide
Configuring Basic DVMRP Interoperability Features
34-49