From: Scott Vermillion (scott_ccie_list@it-ag.com)
Date: Wed Oct 24 2007 - 18:51:33 ART
Hi Martin,
The summarization task seems to be the bar-none favorite trick of IPv6
authors. It plays on your IPv4 thought process, which tends to overlook the
hex aspect of IPv6 addresses - especially when confronted with addresses
which only contain digits. If your base address is 2001:141:1:: and you
need to extend out to 2001:141:1:25/64, remember your alphabet soup.
____
2001:141:1:0/64
2001:141:1:1/64
...
2001:141:1:9/64
2001:141:1:A/64
...
2001:141:1:F/64
(16 networks)
____
2001:141:1:10/64
2001:141:1:11/64
...
2001:141:1:19/64
2001:141:1:1A/64
...
2001:141:1:1F/64
(16 networks)
____
2001:141:1:20/64
2001:141:1:21/64
...
2001:141:1:25/64
(6 networks)
So you need a mask which encompasses 38 networks, which is greater than the
32 that a /59 mask would cover. Thus, /58, which actually takes you out
thru 2001:141:1:3F/64.
You might want to spend some time on the DocCD or read Doyle Vol II to shore
up your IPv6 knowledge. I know I need to take yet another pass at it and
refresh my memory on several key points. My guess is that at least one or
two of the IPv6 points are easy picking in the lab if you can keep just a
handful of fundamentals fresh in your mind...
Regards,
Scott
----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Martin McGannon
Sent: Wednesday, October 24, 2007 3:01 PM
To: ccielab@groupstudy.com
Subject: IPV6 Question
Hi,
A few basic questions :-
If requested to summarize the following prefixes in IPV6 what would the
summary address be
2001:141:1:12/64
2001:141:1:25/64
2001:141:1::/58 or 59? and why.
Also in a prevoius lab exexcise I was asked to implement Site Local
Addressing
with my existing IPV4 address in place. The interface address was
192.168.1.100 say. How would I create a Site Local address from this, give
that the first 10 bits are always FEC0:X:X etc.. Any ideas.
Lastly with RIPNG over NBMA do we need to add the broadcast keyword for the
link locals. Can we use neighbor statements under the Router Process.
Many Thanks,
Martin
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