From: James (james@towardex.com)
Date: Sat Jan 29 2005 - 16:12:43 GMT-3
On Sat, Jan 29, 2005 at 10:12:42AM -0500, my-ccie-test@libero.it wrote:
> Hi guys,
> I'm just started to study for my ccie lab test.
> I'm studing on Netmasterclass DOiT.
> it says in IPV6 topic:
>
> configure site-local subnet 7B on R1,R2,R3. Use SLA number A for this part of the network.
> DOiT says the address is FEC0:0:0:A::7B:"x"/125
> I'm confused about subnet-id and SLA number.
>
> I read on RFC 3513:
>
>
> It shows only subnet-id
> So, wath is SLA number?
> Why it doesn't show "7B" in the subnet-id field?
It goes like this way...
2001::/16 - IANA allocation control
2001:4830::/32 - Top Level Aggregator (TLA)
2001:4830:2110::/48 - Next-Level Aggregator (NLA)
2001:4830:2110:3030::/64 - Site-Level Aggregator (SLA)
2001:4830:2110:3030::1:1/128 - SLA -> Subnet ID of 1
The SLA is the /64 prefix length, which is the fourth octet of the v6 block.
So 3ffe:401d:DEAD:BEEF::/64 is an SLA, where as 3ffe:401d:DEAD::/48 is NLA.
So to answer DOiT lab's question, they specified site-local address which
starts with FEC0::/16 and requested that you use "A" for SLA which is the
fourth octet where /64s are.
So, so far this gives you fec0:0:0:a::/64.
They then said use subnet 7B to hold the router addrs at the end.
Just take the last octet before the host part, so fec:0:0:0:a::7b:1/125 as
an example.
-J
-- James Jun TowardEX Technologies, Inc. Technical Lead Boston IPv4/IPv6 Web Hosting, Colocation and james@towardex.com Network design/consulting & configuration services cell: 1(978)-394-2867 web: http://www.towardex.com , noc: www.twdx.net
This archive was generated by hypermail 2.1.4 : Wed Feb 02 2005 - 22:10:27 GMT-3