[156331] in North American Network Operators' Group
RE: Layer2 over Layer3
daemon@ATHENA.MIT.EDU (Paul Vinciguerra)
Fri Sep 14 18:09:26 2012
From: Paul Vinciguerra <pvinci@VinciConsulting.com>
To: Philip Lavine <source_route@yahoo.com>, David Swafford
<david@davidswafford.com>
Date: Fri, 14 Sep 2012 22:08:29 +0000
In-Reply-To: <1347660353.52370.YahooMailNeo@web121702.mail.ne1.yahoo.com>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Philip,
Here is the best reference I know of to address your issue.
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_pape=
r_c11_493718.html#wp9000281
From: Philip Lavine [mailto:source_route@yahoo.com]
Sent: Friday, September 14, 2012 6:06 PM
To: David Swafford; Paul Vinciguerra
Cc: NANOG list
Subject: Re: Layer2 over Layer3
If the psuedowire is setup to allow a vlan to be exteneded, but the vlan is=
already extended over a dedicated link, how will spanning tree behave? Rig=
ht now I have it setup and I dont see the psuedowire trunk in a blocking st=
ate. Will the switch that has both the pseudowire trunk on it and the dedic=
ated link know how to forward the frames if either goes away?
From: David Swafford <david@davidswafford.com<mailto:david@davidswafford.co=
m>>
To: Paul Vinciguerra <pvinci@vinciconsulting.com<mailto:pvinci@vinciconsult=
ing.com>>
Cc: Philip Lavine <source_route@yahoo.com<mailto:source_route@yahoo.com>>; =
NANOG list <nanog@nanog.org<mailto:nanog@nanog.org>>
Sent: Wednesday, September 12, 2012 7:46 PM
Subject: Re: Layer2 over Layer3
Hey Philip,
Any Transport over MPLS will do this too. Here's a link to an example
setup of two sites where just L3 connectivity exists between them:
https://w.ntwk.cc/working-on-atompls/. In that setup, I have just
IPSEC VPN connecting the two locations, but have an 802.1q trunk
extended between both. In the example configs, Fa0/1 on both ends is
a transparent L2 connection. The boxes used here were 3725s on 12.4T.
David.
On Wed, Sep 12, 2012 at 3:37 PM, Paul Vinciguerra
<pvinci@vinciconsulting.com<mailto:pvinci@vinciconsulting.com>> wrote:
> ASR supports OTV if you can do multicast over L3. Although, you may not =
need L2 extensions in the end.
>
> -----Original Message-----
> From: Philip Lavine [mailto:source_route@yahoo.com<mailto:source_route@ya=
hoo.com>]
> Sent: Wednesday, September 12, 2012 6:23 PM
> To: NANOG list
> Subject: Layer2 over Layer3
>
> To all,
>
> I am trying to extend a layer2 connection over Layer 3 so I can have redu=
ndant Layer connectivity between my HQ and colo site. The reason I need thi=
s is so I can give the "appeareance" that there is one gateway and that bot=
h data centers can share the same Layer3 subnet (which I am announcing via =
BGP to 2 different vendors).
>
> I have 2 ASR's. Will EoMPLS work or is there another option?
>
> Philip
>
