Advertising Network 0.0.0.0 To Dvmrp Neighbors - Cisco WS-C3550-12G Software Configuration Manual

Configuring Basic DVMRP Interoperability Features
Command
Step 11 show running-config
Step 12
copy running-config startup-config
To disable the filter, use the no ip dvmrp accept-filter access-list-number [distance] neighbor-list
access-list-number interface configuration command.
This example shows how to configure a DVMRP tunnel. In this configuration, the IP address of the
tunnel on the Cisco multilayer switch is assigned unnumbered, which causes the tunnel to appear to have
the same IP address as Gigabit Ethernet interface 0/1. The tunnel endpoint source address is 172.16.2.1,
and the tunnel endpoint address of the remote DVMRP router to which the tunnel is connected
is 192.168.1.10. Any packets sent through the tunnel are encapsulated in an outer IP header. The Cisco
multilayer switch is configured to accept incoming DVMRP reports with a distance of 100
from 198.92.37.0 through 198.92.37.255.
Switch(config)# ip multicast-routing
Switch(config)# interface tunnel 0
Switch(config-if)# ip unnumbered gigabitethernet 0/1
Switch(config-if)# ip pim dense-mode
Switch(config-if)# tunnel source gigabitethernet 0/1
Switch(config-if)# tunnel destination 192.168.1.10
Switch(config-if)# tunnel mode dvmrp
Switch(config-if)# ip dvmrp accept-filter 1 100
Switch(config-if)# interface gigabitethernet 0/1
Switch(config-if)# ip address 172.16.2.1 255.255.255.0
Switch(config-if)# ip pim dense-mode
Switch(config)# exit
Switch(config)# access-list 1 permit 198.92.37.0 0.0.0.255

Advertising Network 0.0.0.0 to DVMRP Neighbors

If your multilayer switch is a neighbor of an mrouted version 3.6 device, you can configure the Cisco
IOS software to advertise network 0.0.0.0 (the default route) to the DVMRP neighbor. The DVMRP
default route computes the RPF information for any multicast sources that do not match a more specific
route.
Do not advertise the DVMRP default into the MBONE.
Beginning in privileged EXEC mode, follow these steps to advertise network 0.0.0.0 to DVMRP
neighbors on an interface:
Command
Step 1
configure terminal
Step 2 interface interface-id
Catalyst 3550 Multilayer Switch Software Configuration Guide
24-48
Purpose
Verify your entries.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify the interface that is
connected to the DVMRP router.
Chapter 24 Configuring IP Multicast Routing
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