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Multicast Addressing
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| wirelessboy 2003-04-02, 12:29 am |
| hi everybody
please correct me if i am wrong
For converting the Multicast ip to Ethernet MAC add, we always take the last bit of the 3 octet as 0.
say
225.1.25.2 = 1110-0001.(0)0000001.00011001.00000010
from the right 24 bit is always zero, (first of all please confirm whether that is true).
so the MAC add = 01-00-5E-01-19-02.
So Shouldnt it be only 2 power 4 or 16 multicast ips with the same MAC address.
1110 + a combination of 16 ips that is from 224 to 239.
so 224.1.1.1 and 225.1.1.1 can not be a part of the same IGMP group.
so why is it that it is 32 Multicast ips have the same MAC address.
regards | |
| darthfeces 2003-04-02, 10:30 pm |
| check out the cisco musticast book
it turns out that the people initially doing the research didn't have enough budget to reserve ample address space to cover a full mac to ip 1 to 1 mapping so they had to borrow bits.
or mush them together hoping they would not overlap on the same network | |
| Yankee 2003-04-04, 2:31 am |
| The book is Developing IP Multicast Networks, Vol 1 (page 31) and it is a good story.
Yankee | |
| wirelessboy 2003-04-04, 7:54 pm |
| hello guys
can anyone post a simple Multicast preactical Lab for me, so that i can try this thing, in my lab for the first time!
a very simple topology, with confs would do
thanks and regards | |
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| Multicast Quick-Start Configuration Guide
http://makeashorterlink.com/?Q22A62B14
If you don't have a login try searching for the title on CCO.
It breaks muticasting down quite well - and is easier reasing then the book previously mentioned - though the book will have the details.
You sent me a PM asking about multicasting clients, I have only done it using routers as clients for pings to ensure reachability. If you have servers then you mya require software, netmeeting comes to mind as does cisco IP TV viewer. Though I haven't done this.
You could also use a tool provided in IOS called "MRM" for testing, try searching CCO and groupstudy R&S archives for more info.
HTH. | |
| darthfeces 2003-04-06, 10:42 am |
| i'm in the middle of testing an iptv deploy
it's pretty dammm cool.
live cable tv and dvd/vhs
get to watch holy grail and ep2 and matrix at work.
(and my mother said i'd never get a job watching tv)
you should be able to download the client with a cco. but then you'd have to have a source ..... videofurnace makes a product.
you still need a server with a capture card.
mac tv is multilcast aware |
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