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Multicast Routing Commands
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default-gateway
This command specifies 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 route 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 found 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 interface, the router drops it because only the default
upstream interface can forward multicast traffic from an unknown source.
Example
ip dvmrp
This command enables DVMRP on the specified interface. Use the no form to
disable DVMRP on this interface.
Syntax
ip dvmrp
no ip dvmrp
Default Setting
Disabled
Command Mode
Interface Configuration (VLAN)
Console(config-router)#default-gateway 10.1.0.253
Console(config-router)#