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IPv6 Multicast address

i want to know what is the different between Site Local Multicast Scope (5) and Organisation Local Multicast Scope (8) in IPv6 Multicast addressing?

and can anybody explaine me the use of Anycast properly...? i am able to understand that its address of the Host in multicast group which is very near to source in terms of metrics but can any one give me exect example of it?

looking for help...

regards

Devang

1 REPLY
Cisco Employee

Re: IPv6 Multicast address

Here are the definitions from RFC4291:

Site-Local scope is intended to span a single site.

Organization-Local scope is intended to span multiple sites belonging to a single organization.

http://www.ietf.org/rfc/rfc4291.txt?number=4291

As far as anycast is concerned, it is intended to loadshare workload among multiple servers providing the same service(s). The clients go to the anycast address nearest to them and if the server fails they then go to the next one.

DNS would be a good example of a service that can be delivered using anycast.

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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