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

[Arie Vayner (avayner)]

Hi,

Well, OTV is there to mostly allow L2 interconnections across an IP
cloud, while FabricPath is mostly designed to scale up the L2 domain in
a really large L2 environment (often in the same location).
Mind you, this is a very simplistic view of both technologies, which
would most likely require a couple of hours to cover completely...

For Layer 2 DCI there are quite a few other solutions you may look at.
The differences are around scale, capacity (bandwidth/number of
vlans/hosts etc), convergence speeds, available infrastructure (IP, MPLS
etc), and some other factors.

Some references:
http://www.cisco.com/en/US/netsol/ns975/index.html
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_p
aper_c11_493718.html
http://blogs.cisco.com/datacenter/introduction-to-%E2%80%9Ccisco-datacen
ter-interconnect-dci%E2%80%9D/

Also, I would recommend this Cisco Press book:
http://www.ciscopress.com/bookstore/product.asp?isbn=1587059924


Layer 2 DCI is most likely something you want to discuss with your
account team, as there are quite a few pit falls as well as quite a few
different design alternatives.

Arie



-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Nargos Ftw
Sent: Monday, March 12, 2012 19:26
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] About a post made from user lpd at cisco.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_thre
aded#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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