Command:

ip multicast ttl-threshold


Mode:

Router(config-if)#

Syntax:

ip multicast ttl-threshold ttl-value

no ip multicast ttl-threshold [ttl-value]


Syntax Description:

ttl-value

This specifies the time-to-live value, expressed in hops. It can be a value from 0 to 255. The default value is 0, which means that all multicast packets are forwarded out the interface.


Command Description:

To configure the time-to-live (TTL) threshold of packets being forwarded out an interface, use the ip multicast ttl-threshold interface configuration command. To return to the default TTL threshold, use the no form of this command.

Only multicast packets with a TTL value greater than the threshold are forwarded out the interface.

You should configure the TTL threshold only on border routers. Conversely, routers on which you configure a TTL threshold value automatically become border routers.

This command replaces the ip multicast-threshold command, which is obsolete.

Example:

The following example sets the TTL threshold on a border router to 200, which is a very high value. This means that multicast packets must have a TTL greater than 200 in order to be forwarded out this interface. Multicast applications generally set this value well below 200. Therefore, setting a value of 200 means that no packets will be forwarded out the interface.

Router(config)#interface tunnel 0
Router(config-if)#ip multicast ttl-threshold 200

Misconceptions:
None

Related Commands:
None

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