[c-nsp] Possible to trunk over Serial or DSL?

[Gert Doering]

Hi,

On Wed, May 09, 2012 at 01:15:46PM +0100, Darren O'Connor wrote:
> Basically what I'm trying to do is run subinterfaces, with each of those
> subinterfaces in a separate vrf. So while I can have fa0/1.10 and
> fa0/1.20 in different vrfs on the same box, I would like to be able to
> do the same over Serial and/or ADSL.   

On an E1, you can use frame relay encapsulation, and map different DLCIs
to subinterfaces (I do not have a configuration ready to share, but cisco
docs should have plenty of examples).

On ADSL, this is harder, as you do not really have a transparent HDLC
stream between both ends - it might work running multiple PPPoE sessions, 
but that's not properly supported on Cisco CPEs, and would be ugly
anyway (and whether it can work at all depends on how this specific 
ADSL circuit is implemented end-to-end).  MPLS-over-PPP might be an
option here.

> I have been able to do this with an old Riverstone so technically it
> should be possible. 

It is, you just need to "tag" the frames in a way to make the other end
recogize them - and that's basically what a frame relay DLCI does.

(Of course Riverstone could use whatever they like, as an E1 is really
quite transparent here regarding frame contents and interpretation...)

gert
-- 
USENET is *not* the non-clickable part of WWW!
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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