From: Scott Morris (swm@emanon.com)
Date: Fri Sep 15 2006 - 22:33:21 ART
Except for the L bit. If you have been told that this is your ASSIGNED
Global ID, should the L-bit not be 0? If you locally assigned your own, by
whatever choice you feel like, then it would be 1.
Semantics mostly.
Right now, per this RFC locally created ID's is the ONLY way to do things.
Per the draft standard (pre-RFC which was around when I wrote this part of
the lab), there was going to be a globally assigned registry for uniqueness.
That portion never made it past draft. In the configs supplied, you'll find
the answer containing FC as the first byte. Arguably, FD is correct per the
RFC.
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-J
IPExpert VP - Curriculum Development
IPExpert Sr. Technical Instructor
smorris@ipexpert.com
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
AllaboutCisco
Sent: Friday, September 15, 2006 8:09 PM
To: srdja blagojevic; ccielab@groupstudy.com
Cc: 'Chee Chew Leong'
Subject: IPv6 Global ID - is this right?
Interesting bit.. after having read thru on Global ID, would this be the
correct way of addressing it given the 40-bit global ID A1B2C3D4E5:
FDA1:B2C3:D4E5:5::5/64
Prefix: FC00/7 with L-bit = 1, therefore we get FD --According to RFC4193--
Concatenate FC00::/7, the L bit set to 1, and the 40-bit Global ID to create
a Local IPv6 address prefix.
Then the rest of the 40-bit (A1B2C3D4E5) is concatenated, leaving now 16-bit
for our SubnetID ("5" was randomly chosen, maybe picked off from R5?) and
finally 64-bit for interfaceID.
Appreciate any feedback on this one..
Thanks.
Cheers,
K
----- Original Message -----
From: "srdja blagojevic" <srdja1@pexim.co.yu>
To: "'Chee Chew Leong'" <cleong3@csc.com>; <ccielab@groupstudy.com>
Sent: Wednesday, September 13, 2006 5:10 PM
Subject: RE: ipv6 addressing
> Chee,
>
> I think that this is what you are looking for (general ID <=>
> general-prefix):
>
>
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/ipv6
> _c/v6addres.htm#wp1132473
>
>
> hth,
> Srdja
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Chee
> Chew Leong
> Sent: Monday, September 11, 2006 09:19
> To: ccielab@groupstudy.com
> Subject: ipv6 addressing
>
> The question said
>
> Each router should have a Unique-Local address assigned to a loopback
> interface. Your global ID is A1B2C3D4E5.
>
> I have search a round what is the meaning of the global ID and how is it
> relates to unique-local address.
>
> How to interprete this?
>
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