From: ccie2be (ccie2be@nyc.rr.com)
Date: Wed Apr 20 2005 - 09:56:09 GMT-3
Sam,
Thanks for getting back to me. I appreciate it.
I think your answer is correct but the issue I still have is this:
Why did you decide to use
FEC0::D:B:0:0:2/125 on R2 and FEC0::D:B:0:0:1/125 on R1
instead of, for example,
FEC0::B:D:0:0:2/125 on R2 and FEC0::B:D:0:0:1/125 on R1
or this:
FEC0::D:0:0:B:2/125 on R2 and FEC0::D:0:0:B:1/125 on R1
In this task is there one and ONLY one correct answer or many possible
correct answers?
The trouble I'm having with this problem is that in the Cisco doc's they
show examples of ipv6 addresses using a SLA and a subnet ID but never both
of these fields in the same type of address. And, in the examples, both the
SLA and subnet ID occupy the same position - bits 49 to 64 from the left -
in the address.
Clearly, its not possible for both the subnet id and the SLA to occupy the
same bits at the same time in the same type of address. So, why is it you
choose to make the subnet, B, part of the interface id and place it where
you did?
Thanks, Tim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Sam
Joseph
Sent: Tuesday, April 19, 2005 9:28 PM
To: ccie2be@nyc.rr.com
Cc: ccielab@groupstudy.com
Subject: RE: ipv6: SLA and subnet ID
Hi Tim,
How about the following Address:
FEC0::D:B:0:0:2/125 on R2 and FEC0::D:B:0:0:1/125 on R1
My Explanation:
First 48 bits are FEC0:0:0 ( 3hex)
Subnet ID is 000D (1 hex)
Interface ID is B:0:0:1 (SLA in this case since this is specific to site or
local to the organization)
If any better thoughts, please come forward.
Thx,
Sam
>From: "ccie2be" <ccie2be@nyc.rr.com>
>Reply-To: "ccie2be" <ccie2be@nyc.rr.com>
>To: "Group Study" <ccielab@groupstudy.com>
>Subject: ipv6: SLA and subnet ID
>Date: Tue, 19 Apr 2005 18:43:16 -0400
>
>Hi guys,
>
>If I'm given this info in the lab, how do I figure out where to put what:
>
>1. All ipv6 addresses will use FEC0/125 unless otherwise specified.
>
>2. Configure a site-local subnet D between R1 and R2 and use SLA number B.
>
>
>From the Cisco documentation, a site local address has a subnet ID but not
>a
>SLA. While a global unicast address has a SLA but not a subnet ID.
>
>Now, I realize that with a netmask of /125, there's lots of room to put
>things where I want but if given only the above info, how do I figure out
>what's OK?
>
>TIA, Tim
>
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