[156330] in North American Network Operators' Group
Re: Layer2 over Layer3
daemon@ATHENA.MIT.EDU (Philip Lavine)
Fri Sep 14 18:06:53 2012
Date: Fri, 14 Sep 2012 15:05:53 -0700 (PDT)
From: Philip Lavine <source_route@yahoo.com>
To: David Swafford <david@davidswafford.com>,
Paul Vinciguerra <pvinci@vinciconsulting.com>
Cc: NANOG list <nanog@nanog.org>
Reply-To: Philip Lavine <source_route@yahoo.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
If the psuedowire is setup to allow a vlan to be exteneded,=A0but=A0the vla=
n is already extended over a dedicated link, how will spanning tree behave?=
Right now I have it setup and I dont see the psuedowire trunk in a blockin=
g state. Will the switch that has both the pseudowire trunk on it and the d=
edicated link know how to forward the frames if either goes away?=0A=A0=0A =
=0A=0A________________________________=0A From: David Swafford <david@david=
swafford.com>=0ATo: Paul Vinciguerra <pvinci@vinciconsulting.com> =0ACc: Ph=
ilip Lavine <source_route@yahoo.com>; NANOG list <nanog@nanog.org> =0ASent:=
Wednesday, September 12, 2012 7:46 PM=0ASubject: Re: Layer2 over Layer3=0A=
=0AHey Philip,=0A=0AAny Transport over MPLS will do this too.=A0 Here's a=
link to an example=0Asetup of two sites where just L3 connectivity exists =
between them:=0Ahttps://w.ntwk.cc/working-on-atompls/.=A0 In that setup, I =
have just=0AIPSEC VPN connecting the two locations, but have an 802.1q trun=
k=0Aextended between both.=A0 In the example configs, Fa0/1 on both ends is=
=0Aa transparent L2 connection.=A0 The boxes used here were 3725s on 12.4T.=
=0A=0ADavid.=0A=0A=0A=0A=0AOn Wed, Sep 12, 2012 at 3:37 PM, Paul Vinciguerr=
a=0A<pvinci@vinciconsulting.com> wrote:=0A> ASR supports OTV if you can do =
multicast over L3.=A0 Although, you may not need L2 extensions in the end.=
=0A>=0A> -----Original Message-----=0A> From: Philip Lavine [mailto:source_=
route@yahoo.com]=0A> Sent: Wednesday, September 12, 2012 6:23 PM=0A> To: NA=
NOG list=0A> Subject: Layer2 over Layer3=0A>=0A> To all,=0A>=0A> I am tryin=
g to extend a layer2 connection over Layer 3 so I can have redundant Layer =
connectivity between my HQ and colo site. The reason I need this is so I ca=
n give the "appeareance" that there is one gateway and that both data cente=
rs can share the same Layer3 subnet (which I am announcing via BGP to 2 dif=
ferent vendors).=0A>=0A> I have 2 ASR's. Will EoMPLS work or is there anoth=
er option?=0A>=0A> Philip=0A>
