Re: VPC layer 2 extension between data centers

Does someone within you know if we could make a type of traffic
engineering in vPC or VSS? I means make cheaper links active and use the
costly link only in case of failure.

I'm really in love with Nexus 7k and OTV, but.. :-)

Thanks for your infos,

Viet

On 03/19/2013 07:00 PM, Brian McGahan wrote:
> This is a normal validated design actually: http://imgur.com/2ILkATY
>
> See "Cisco Data Center Interconnect Design and Implementation Guide"
> http://www.cisco.com/en/US/solutions/collateral/ns340/ns517/ns224/ns949/ns304/ns975/data_center_interconnect_design_guide.pdf
>
> VSS will support the same design here as vPC, but vPC has better support for split-brain detection during certain corner-case failure scenarios. If designed properly -operative word being *if* here :) - you should not get a layer 2 loop like Marc mentioned. Of course whenever you span the layer 2 domain you also span the failure domain, so you have to make sure all your ducks are in a row with things like your root bridge placement, root guard, bpdu filters, bridge assurance, etc.
>
> It would ideally be a better design to do this with OTV vs. Back-to-Back vPC, because OTV has special enhancements specifically for the DCI, such as termination of the STP domain, layer 2 filtering capabilities, ARP caching on the edge, etc. Your limiting factor will be though that OTV isn't supported on Nexus 5K, only 7K. Another option would be to dedicate a separate platform to it, such as ASR 1002, etc. The drawback of going to N7K or ASR of course then is the cost.
>
> So long story short, yes you can do back-to-back vPC for this design and it will work.
>
>
> HTH,
>
> Brian McGahan, CCIE #8593 (R&S/SP/Security), CCDE #2013::13
> bmcgahan_at_INE.com
>
> Internetwork Expert, Inc.
> http://www.INE.com
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of marc abel
> Sent: Tuesday, March 19, 2013 11:41 AM
> To: Viet-Hung TON
> Cc: Cisco certification
> Subject: Re: VPC layer 2 extension between data centers
>
> This is technically feasible, but sounds like a truly awful idea to me.
> Rather than adding redundancy you are turning both data centers into one giant failure domain. I just saw a layer 2 loop wipe out an entire data center, with this solution you could wipe out both.
>
> My $0.02 cents.
>
> -Marc
>
>
> On Tue, Mar 19, 2013 at 10:16 AM, Viet-Hung TON <vton_at_integra.fr> wrote:
>
>> Hi all,
>>
>> Do you have any experiences about using VPC to connect between two
>> data centers in different geography? I plan using 2 nexus 5000 each
>> site fo redundancy, the connections are based on physical dark fibers
>> WDM. The latency between 2 sites is around 1.5 - 2 ms. Otherwise, the
>> VSS runs well in this case?
>>
>> Thanks for your share.
>>
>> Viet
>>
>>
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>
> --
> Marc Abel
> CCIE #35470
> (Routing and Switching)
>
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Received on Thu Mar 21 2013 - 17:15:28 ART