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Posted by Art on July 26, 2005, 11:57 pm
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using the command on the interface receiving the multicast:
" The ip multicast ttl-threshold <value> command means that any packets with
a TTL lower than the specified threshold, in this case, 15, are not
forwarded. This command is usually used to provide a border to keep internal
multicast traffic from drifting out of the intranet. " extracted from:
http://www.cisco.com/en/US/tech/tk828/technologies_tech_note09186a0080094b55
..shtml#ttlsetting
It is very easy to me to change via SNMP the TTL value of the multicast
video server (encoder) on the fly. I know how many hops the multicast video
has to travel from source to destination (width of my network). My longest
hop count is 4, if I set my edge router with a TTL of 10 for example, I
will set the ttl on the encoder to 13 when I don't want the video to go out
and 15 when I do.
By doing this I don't have to do anything with the router via scripts or
anything like that.
Some video encoders are not 4 hops apart from the edge router, so a database
with the right TTL per video encoder will be needed. For example an encoder
connected to the network where the edge is connected to, shall be set to a
TTL value of 10 in order to be blocked. (asuming my previous example of
setting a threshold of 10 in the router.)
Thanks!
"Ivan Ostres" <> wrote in message
> says...
> > Question: Is it possible to dynamically activate or deactivate access
> > control list on the edge router, from a windows application? Some kind
of
> > scripting maybe?
> >
> >
> >
> > The operators that are watching the videos from the local network should
be
> > able to enable/disable video streams from going out to the remote
clients.
> >
> >
> >
> > Any thoughts?
> >
> >
>
> It could be done on various ways but I think you'll have to script in
> any way. One way would be to add/remove an access-list trough a script
> or add/remove "ip multicast ttl-threshold ttl-value" command. You could
> probably do the same using SNMP and that could be much "cleaner" way to
> do it. www.cisco.com is your friend.
>
>
> --
> Ivan
>
> *** User rot13 to see my eMail address ***
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