From: Nick Griffin (nick.jon.griffin@gmail.com)
Date: Sat Dec 09 2006 - 11:55:34 ART
Somewhere (my apologies) I heard to it referred to as a hurdle. That seems
to have stuck with me.
On 12/9/06, anthony.sequeira@thomson.com <anthony.sequeira@thomson.com>
wrote:
>
> Thanks to Ivan for pointing out an issue with the Multicast TTL question
> from last week!
>
>
>
> Please note: the TTL threshold works OPPOSITE of how you might think!
> Only packets that have a TTL GREATER than the TTL configured on the
> interface are forwarded. Please examine the question and answer below
> carefully for those of you that are interested in this feature:
>
>
>
> 7-7-5. An administrator in your network has configured the ip multicast
> ttl-threshold command on a router and set the TTL Threshold to 12. Which
> of the following TTL values of packets will trigger a packet drop?
> Choose all that apply.
>
>
>
> a. 6
> b. 12
> c. 13
> d. 15
>
>
>
> Answer: a, b
>
>
>
> Topic Domain: 7d
>
>
>
> Issues:
>
> What is the multicast TTL? How does the TTL Threshold work in multicast
> environments?
>
>
>
> Solutions:
>
> Multicast TTL is a method for scoping multicast traffic. Multicast
> packets have a TTL value that potentially controls their propagation. If
> a router is configured with a threshold - the packet is not forwarded if
> it has a TTL less than or equal to the configured threshold. In other
> words, the TTL on the multicast packet must be greater than the
> threshold to be forwarded. Another method of scoping multicast traffic
> is to use the administrative multicast address range.
>
>
>
> More Information:
>
> IP Multicast Troubleshooting Guide
>
> http://www.cisco.com/warp/public/105/mcastguide0.html#ttlthreshold
>
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