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default-gateway

Use this command to specify the default DVMRP gateway for IP multicast
traffic. Use the no form to remove the default gateway.
Syntax
default-gateway ip-address
no default-gateway
ip-address - IP address of the default DVMRP gateway.
Default Setting
None
Command Mode
Router Configuration
Command Usage
• The specified interface advertises itself as a default route to
neighboring DVMRP routers. It advertises the default rout e out
through its other interfaces. Neighboring routers on the other
interfaces return Poison Reverse messages for the default route back to
the router. When the router receives these messages, it records all the
downstream routers for the default route.
When multicast traffic with an unknown source address (i.e., not foun d
in the route table) is received on the default upstream route interface,
the router forwards this traffic out through the other interfaces (with
known downstream routers). However, when multicast traffic with an
unknown source address is received on another interf ace, the router
drops it because only the default upstream interface can forward
multicast traffic from an unknown source.
Example
Console(config-router)#default-gateway 10.1.0.253
Console(config-router)#