From: Frank Center (ccahoon@maine.rr.com)
Date: Tue May 03 2005 - 15:03:59 GMT-3
Is there a show command to view the site-local address?
----- Original Message -----
From: "Jonathan ZD" <Nuvo25@hotmail.com>
To: <my-ccie-test@libero.it>; <ccielab@groupstudy.com>
Sent: Saturday, January 29, 2005 12:55 PM
Subject: Re: IPv6 Addressing
> The Address Structure for "Site-Local Unicast Address" is :
>
> 1st 10-bit : Site-Local unicast address identification (1111 1110 11 =
FEC0)
> 2nd 38-bit : All Zero
> 3nd 16-bit (another word - last 16-bit of the 1st 64-bit of the address) :
> SLA (Site-Level Aggregator)
> Last 64-bit: Inteface-ID (Auto Generated by converting interface physical
> address (mac-address) into EUI-64 format)
>
> Therefore, for the requirement, the address should be in the form of:
>
> FEC0: :A:X:X:X:X
>
> Where X:X:X:X: part is the auto-generated interface-id.
>
> *** The Address Structure - Refer to the section "3.1 Aggregatable Global
> Unicast Address Structure" from RFC 2374
> *** The SLA (Site-Level Aggregator) - Refer to the section "3.5 Site-Level
> Aggregation Identifier" from RFC 2374
>
> The answer from your work book kinda confuse me too.
>
> 1) I don't know that they mean by "site-local subnet 7B", and why that
> address (7B) appear in the last 16 octect of the Interface-id??? For me,
> site-local subnet should be part of SLA.
>
> 2) For Site-Local address, I believe that we (users) can only manipulate
the
> SLA part of the address, the last 64-bit of the address (interface-id)
> should be generated by the router, so I don't understand how DOiT put "7B"
> under interface-id part of the address.
>
> 3) What they mean by "X" under the address???
>
> ----- Original Message -----
> From: <my-ccie-test@libero.it>
> To: <ccielab@groupstudy.com>
> Sent: Saturday, January 29, 2005 7:12 AM
> Subject: IPv6 Addressing
>
>
> > 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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>
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