ip multicast ttl-threshold
ip multicast ttl-threshold ttl-value
no ip multicast ttl-threshold [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.
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This command replaces the ip multicast-threshold command, which is obsolete.
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
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