Multicast IP addressing

Hi Experts,

I was just wondering if I can get examples of how you guys handle the multicast addressing in a PIM-sparse environmnent.
We have vendors that come in and just randomly pick an IP addressing within the multicast range. What happens if they pick a multicast IP that is already in use by another application? Will they get some kind of a warning?
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Ken BooneNetwork ConsultantCommented:
No.  They will not get a warning.  

Multicast ip addresses are broken into 3 ranges:

There is a well-known range, a global Internet Usage range, and then a local private range if you will.  The private range is from to  So if they are setting up applications on your network that will just be used on your network that is the range that they need to use.  

This range should be managed.  i.e. keep documentation of what multicast address is assigned to what application.


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typertecAuthor Commented:
Kenboonerjr, is that how you do it? Do you just keep it all in a spreadsheet?
Ken BooneNetwork ConsultantCommented:
Yes, typically an environment will have a few multicast addresses in use.  Typically there will be a few multicast addresses on a network that are in the well-known range, i.e. routing protocols, etc..  So it is nice for documentation purposes to have a record of all the multicast addresses in use on your network.  This way if you are tracking down a problem at a some point and see them show up in a sniffer you will not be scratching your head wondering what this traffic is.
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