From: Balaji Siva (bsivasub@gmail.com)
Date: Wed Feb 02 2005 - 01:19:16 GMT-3
James,
Just curious, do we have to use SLA for the link-local address as
format doesn't say it ... i know the "step say use SLA of A" but do
you have to use it. Or is it only relevant when configuring
Aggregatable Global Address.
Thanks
Balaji
On Sat, 29 Jan 2005 14:12:43 -0500, James <james@towardex.com> wrote:
> 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
>
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