[c-nsp] About a post made from user lpd at cisco.com

[Keegan Holley]

I think the information you posted pretty much sum's it up.  OTV can span
layer-3 hops, fabric-path is all layer-2.  I'm sure someone from cisco can
elaborate further, but the differences are simple since there are existing
protocols that do the same things.  OTV is like VPLS/L2VPN without mpls
(the good and the bad).  Last I checked they used ISIS behind the scenes to
send mac address information about and handle loop avoidance similar to
what VPLS does.  Fabric-path is similar to TRILL or DCB/PBB.  It just finds
a way around the spanning-tree limitations of blocked ports allowing
layer-2 domains to scale further.  I think fabric-path also supports FCoE.
I will admit I know more about the standards based stuff than the cisco
proprietary protocols.

2012/3/12 Nargos Ftw <nargosftw at gmail.com>

> Hello.
>
> Hope you read it.
> I was on google looking for information about differences between OTV and
> Fabricpath and found this post of yours:
>
> http://www.gossamer-threads.com/lists/cisco/nsp/134263?do=post_view_threaded#134263
>
> In that post, you mention that:
> "OTV is a technology that allows us to extend L2 across any L3 (IP)
> infrastructure. Cisco Fabric Path is in essence the ability to run L2
> networks without spanning tree and all links active."
>
> I have 2 datacenters and must extend 2 VLANs. So i tought "Wow, thats OTV
> for sure."
> Then, after researching a little i found that Fabricpath would do the job
> too.
> All i need is interconnect 2 DCs with DWDM and 2 VLANs must be extended.
> Fabricpath is cheaper than OTV.
> I feel dumb, but i cant see the difference between them.
> Both maps L2 address dynamically.
> Both uses routing logic.
> I know that cisco recommends OTV in this case, but Fabricpath would work
> fine.
>
> *What should i do and could you please show me the differences between OTV
> and Fabricpath?* All i see on cisco webpage are presales webpages and
> configuration guides.
>
> Thank you so much.
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