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_paper... 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? Right now I have it setup and I dont see the psuedowire trunk in a blocking state. Will the switch that has both the pseudowire trunk on it and the dedicated link know how to forward the frames if either goes away? From: David Swafford <david@davidswafford.com<mailto:david@davidswafford.com>> To: Paul Vinciguerra <pvinci@vinciconsulting.com<mailto:pvinci@vinciconsulting.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@yahoo.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 redundant Layer connectivity between my HQ and colo site. The reason I need this is so I can give the "appeareance" that there is one gateway and that both 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