IPv6 Addressing

From: my-ccie-test@libero.it
Date: Sat Jan 29 2005 - 12:12:42 GMT-3


Hi guys,
I'm just started to study for my ccie lab test.
I'm studing on Netmasterclass DOiT.
it says in IPV6 topic:

configure site-local subnet 7B on R1,R2,R3. Use SLA number A for this part of the network.
DOiT says the address is FEC0:0:0:A::7B:"x"/125
I'm confused about subnet-id and SLA number.

 I read on RFC 3513:

  Site-Local addresses have the following format:

   | 10 |
   | bits | 54 bits | 64 bits |
   +----------+-------------------------+----------------------------+
   |1111111011| subnet ID | interface ID |
   +----------+-------------------------+----------------------------+

   Site-local addresses are designed to be used for addressing inside of
   a site without the need for a global prefix. Although a subnet ID
   may be up to 54-bits long, it is expected that globally-connected
   sites will use the same subnet IDs for site-local and global
   prefixes.

   Routers must not forward any packets with site-local source or
   destination addresses outside of the site.

It shows only subnet-id
So, wath is SLA number?
Why it doesn't show "7B" in the subnet-id field?

thanks



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