From: Scott Morris (swm@emanon.com)
Date: Mon Dec 26 2005 - 16:12:03 GMT-3
If you look at the standard for site-local addressing, the last 16 bits of
your NETWORK address (so the right-hand 16 bits of the first 64-bits of the
entire address) are assigned to a subnet.
That would be FEC0:0000:0000:xxxx::/64
So of those FOUR hex characters, the two right-most ones would be AC. (the
leading 0's get "dropped" when you display the addresses. It's an assumed
notation. If everyone knows four hex characters go between each set of :'s
and only two are listed, the other two must be 0. Kinda like an IP address,
if I only tell you 10.x.x.x and you know that each number between the
periods should be three characters, you'd write it as 010.x.x.x...
HTH,
Scott
_____
From: de Witt, Duane [mailto:duane.dewitt@siemens.com]
Sent: Monday, December 26, 2005 1:42 PM
To: Anthony Sequeira
Cc: swm@emanon.com; Cisco certification
Subject: RE: Site Local Addressing
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>
[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
<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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