In a simple setup like (where you are not actually routing multicast traffic
but would like CGMP to control multicast traffic at the switch check out:
http://www.cisco.com/warp/customer/473/38.html
It can be done as long as you have 1 router interface in the VLAN. The
secret is to not enable multicast routing at a global level but enable PIM
on the interface. This will then allow CGMP packets to be sent from the
router to the switches. The switches will then not pass multicast groups to
any port that has not received IGMP packets requesting such groups....
Another choice would be to use IGMP snooping if your switch supports it...
You don't need a router for multicasting if everything is in a single
broadcast domain.... The multicast server will just spit out data, the
clients will receive it... The clients will send IGMP requests but since
everything is in a single VLAN they are not needed....
-----Original Message-----
From: Ole Drews Jensen [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, January 17, 2001 11:38 AM
To: '[EMAIL PROTECTED]'
Subject: Multicast: Router and Switch locations
Currently reading about Multicast, which I have not any experience with yet.
If you have a small simple LAN with 1 fileserver, 10 workstations and 1
router to the Internet:
INTERNET---[router]---[switch]---[fileserver & 10 workstations]
In order for that fileserver to send multicast data to participating
workstations without changing the topology, I would have to setup the router
with IGMP and CGMP, so the workstation could tell the router that it joined
a group, and the router could then inform the switch with CGMP about that
workstation. The fileserver would now send multicast data and the switch
would know which interface(s) to forward it out to.
Since the server and every workstation has their own connection to the
switch (and hence has their own individual collision domain), would I be
right in assuming that it would not improve the situation to add an
additional router to act like a filter between the switch and the server?
INTERNET---[router]---[switch]---[10 workstations]
|
[router2]
|
[fileserver]
Also, will we see multicasting work without a router or an rsm but only with
a switch in the future (I know that switches don't understand IGMP)?
Thanks,
Ole
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Ole Drews Jensen
Systems Network Manager
CCNA, MCSE, MCP+I
RWR Enterprises, Inc.
[EMAIL PROTECTED]
http://www.oledrews.com/ccnp
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
NEED A JOB ???
http://www.oledrews.com/job
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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