From: Christopher E. Miller (chrimill@xxxxxxxxx)
Date: Sat May 18 2002 - 04:09:44 GMT-3
The set multicast router 2/1 is optional. It serves to further limit the
scope of multicast traffic. Switches don't support IGMP. You should try
turning on CGMP on both the router and the switch. The switch treats IGMP
like broadcast traffic and floods it out all ports but the receiving. When a
station sends a join via igmp membership report message the switch treats it
like normal. The router receives the IGMP join and send a CGMP message to
the switch letting the switch know what the group is and also what port the
host is on.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Emmanuel Oppong
Sent: Saturday, May 18, 2002 1:40 AM
To: ccielab@groupstudy.com
Subject: RE: CAM Table config for Multicast
Thanks Christopher.
After configuring this: "set cam permanent 01-00-5E-0A-0A-0A 2/1-2 100", do
I also have to configure "set multicast router 2/1-1", so that the switch
knows where the multicast routers are?
I did that and the switch cannot ping the multicast group IP. By the way my
switch does not support igmp. How do I make the switch ping the multicast
group address, assuming I had the write IOS.
Thanks.
-----Original Message-----
From: Emmanuel Oppong [mailto:e-oppong@attbi.com]
Sent: Friday, May 17, 2002 11:06 PM
To: ccielab@groupstudy.com
Subject: RE: CAM Table config for Multicast
Is this correct? You compare the last 23 bits of the base multicast address
to the given multicast ip addres, like below, as mentioned in TCP/IP vol 2
page 402.
Multicast IP: 224.10.10.10 =11100000 0 0001010 00001010 00001010
Hex =(E0 0A 0A 0A)
Base MAC Add: 0100.5E00.0000 =000000001 0 0000000 0000000 00000000
Hex =(01 00 5E 00 00 00)
Resulting Multicast Mac Addr =000000001 00001010 00001010 00001010
Hex =01-00-5E-0A-0A-0A
So the need comand is?
set cam permanent 01-00-5E-0A-0A-0A 2/1-2 100
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Emmanuel Oppong
Sent: Friday, May 17, 2002 10:14 PM
To: ccielab@groupstudy.com
Subject: CAM Table config for Multicast
I want to configure a permanent CAM table entry for ports (2/1, 2/2) in vlan
100 for a multicast group 224.10.10.10. The help feature on my cat5000 has
the following command:
set cam <static|permanent> <multicast_mac> <mod/ports..> [vlan]
My question is, what is <multicast_mac>? Is it the mac address of the
router? If it is not how do I detremine it. All I have is just the
multicast IP address.
Thanks
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