[139583] in North American Network Operators' Group
Re: Implementations/suggestions for Multihoming IPv6 for DSL sites
daemon@ATHENA.MIT.EDU (Luigi Iannone)
Tue Apr 12 04:52:17 2011
From: Luigi Iannone <luigi@net.t-labs.tu-berlin.de>
In-Reply-To: <4F92E49F-35D3-46F9-9F86-1D2E6D081309@delong.com>
Date: Tue, 12 Apr 2011 10:52:10 +0200
To: Owen DeLong <owen@delong.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 11, Apr, 2011, at 17:26 , Owen DeLong wrote:
>>>>=20
>>>> But can you explain better? Why should LISP require more IP space =
than normal IPv4 deployment?
>>>>=20
>>>> If you are a new site, you ask for an IP block. This is independent =
from whether or not you will use LISP.
>>>>=20
>>> Sure, but, if you also need locators, don't you need additional IP =
space to use for locators?
>>=20
>> No, those are the IP address that you provider gives to your border =
router.
>>=20
> Right... In addition to my provider independent addresses... That's =
more address space than is required
> if I am not using LISP.
>=20
No, you just use the IP addresses of the interface to your upstream as =
"locators".=20
Those addresses are there anyway, right?
So using LISP is not adding anything.
>>=20
>> No true. I ask for a PI block that I will use as EID-Prefix, then the =
locators are part of the address space of my providers.
>> There is no duplication.
>>=20
>>=20
> Right... Ordinarily, without LISP, I get a PI block and use that for =
EID and the routing is based on the
> EID prefix. With LISP, the EID prefix is PI and I use additional PA =
resources to do the routing locators.
> That's what I meant by duplication. There are additional PA resources =
required on top of the PI in order
> to make LISP work.
I still do not see this duplication (may be I need more coffee this =
morning..)
You do not need to modify anything in the PA space of your provider. =
Those resources are there and are used to make your block reachable also =
without LISP.=20
Luigi=
