From: Anthony Sequeira (terry.francona@gmail.com)
Date: Mon Dec 26 2005 - 15:53:23 GMT-3
Take a look at the unicast address Figures in the following link:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/ipv6_
c/sa_bconn.htm#wp1027186
You will notice that the 16-bit subnet ID or Site-Level Aggregator (SLA) is
the 16 bits just before the Interface ID of 64 bits.
So if you want to set these bits to 172 - you would do:
FEC0:0:0:AC::4/64
Placing 172 in any other field - you are not hitting the exact SLA field you
are after.
On 12/26/05, de Witt, Duane <duane.dewitt@siemens.com> wrote:
>
> Ok, so since AC is 172 in decimal, if you were asked to set the subnet to
> 172 would you use 0:0:AC or AC:0:0?
>
>
>
> I can see that they look different, but what is the technical difference
> between the two?
>
>
> ------------------------------
>
> *From:* Anthony Sequeira [mailto:terry.francona@gmail.com]
> *Sent:* 26 December 2005 08:02 PM
> *To:* de Witt, Duane
> *Cc:* swm@emanon.com; Cisco certification
> *Subject:* Re: Site Local Addressing
>
>
>
> No - they are not the same!
>
>
>
> Be careful - FEC0:AC::4/64 configures the network portion of the address
> as:
>
>
>
> FEC0:AC:0:0
>
>
>
> While FEC0:0:0:AC::4/64 configures the network portion of the address as:
>
>
>
> FEC0:0:0:AC
>
>
>
> As you can see - these are not the same!
>
>
>
>
>
>
>
> On 12/26/05, *de Witt, Duane* <duane.dewitt@siemens.com> wrote:
>
> Sorry guys, another question:
>
> Would FEC0:AC::4/64 be the same as fec0:0:0:ac::4/64?
>
> If I configure it I get the interface subnet as:
>
> FEC0:AC::4, subnet is FEC0:AC::/64 [TENTATIVE]
>
> Thanks for you help.
>
> -----Original Message-----
> From: Scott Morris [mailto:swm@emanon.com]
> Sent: 26 December 2005 05:49 PM
> To: de Witt, Duane; 'Anthony Sequeira'; 'Cisco certification'
> Subject: RE: Site Local Addressing
>
> No. The "::" represents a lot of 0's. So each of your two examples,
> since
> they represent an ADDRESS ( e.g. 128 bits) when you expand them out would
> be
> significantly different:
>
> Fec0:0000:0000:00ac:0000:0000:0000:0004/64 is the first one
> Fec0:0000:0000:0000:0000:0000:00ac:0004/64 is the second one
>
> HTH,
>
> Scott
>
> -----Original Message-----
> From: de Witt, Duane [mailto:duane.dewitt@siemens.com]
> Sent: Monday, December 26, 2005 3:11 AM
> To: Scott Morris; Anthony Sequeira; Cisco certification
> Subject: RE: Site Local Addressing
>
> Hi
>
> Would fec0:0:0:ac::4/64 be the same as fec0::ac:4/64 ?
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Scott Morris
> Sent: 26 December 2005 06:21 AM
> To: 'Anthony Sequeira'; 'Cisco certification'
> Subject: RE: Site Local Addressing
>
> Looks like it'll work to me. Just like all addresses, you can specify
> either the EUI-64 "magical" addressing or specify your own host ID in
> there
> manually.
>
> The site local format doesn't function any differently, just gives you
> some
> rules to go by. I didn't think the RFC to deprecate that had been
> standardized yet, but IOS still supports it anyway, so my guess is that
> it
> would be fair game on the lab. *shrug*
>
> But again, the concept of addressing will be the same whether it's the
> site-local or any given/derived address range.
>
> Scott
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto: nobody@groupstudy.com] On Behalf Of
> Anthony Sequeira
> Sent: Sunday, December 25, 2005 1:40 PM
> To: Cisco certification
> Subject: Site Local Addressing
>
> Hi everyone!
>
>
>
> Couple of questions on this topic. . .
>
>
>
> First please if you would do not bother to point out that this
> feature
> is deprecated I am completely aware of that. . .
>
>
>
> 1) In all of the documentation I have found I always encounter
> this
> statement "A site local unicast address is an IPv6 unicast address that
> uses
> the prefix range FEC0::/10 and concatenates the subnet identifier with
> the
> interface ID in the EUI-64 format." I find myself a bit
> troubled/confused by
> this statement. I assume that I should not read too much into the word
> concatenates here. It would seem from the diagram that they just mean
> that
> the Subnet ID is next to the interface ID.
>
> 2) Is this example correct, therefore? I want to create a
> Site-Local
> address with the Subnet ID of AC. Correct command is: ipv6 address
> FEC0:0:0:AC::/64 eui-64 Is it that simple?
>
> 3) How about this one? Create a site-local address and use a Subnet
> ID
> of AC and an interface ID of 4. I guess the correct thing to do is keep
> your
> Interface ID at 64 bits.so we do this: ipv6 address fec0:0:0:ac::4/64
> Everyone like?
>
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