Re: VPC layer 2 extension between data centers

I immediately thought OTV as well. drawback being OTV need$ Licen$e.

It is interesting how MEC's evolved on the two different product
lines. I beleive Nexus didn't logically combine Chassis because the of
the unique differences that are required for the FC fabric. Since
Catalyst was never interested in unified ports, they went route that
'stacks' the switches on top.

One other thought on STP. I have rolled out Nexus w/no spanning-tree
(ie Trill, Fabric Path). That licensing will also leave a mark.

Best bet is to weight out risks Vs. budget. What types of failures can
be tolerated and overal business impact in such scenarios. We work on
an expensive canvas so not good practice to not invest in all the
colors for the paining.

Marc Edwards
CCIE #38259

On Tue, Mar 19, 2013 at 11:09 AM, Brian McGahan <bmcgahan_at_ine.com> wrote:
>> In paper, STP runs well too, but in reality, I knows nobody using it for redundancy between datacenters.
>
> Just remember that if you choose vPC as the DCI, you *are* extending STP between the DC sites. The same goes for VSS, which is essentially just glorified StackWise. This is not necessarily a show stopper to span your STP, but it does have design implications. You may consider running MST to collapse your STP instances if you aren't already, which simplifies the control plane topology. The other option like I mentioned in to run OTV which will terminate the STP domain locally.
>
> 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 Viet-Hung TON
> Sent: Tuesday, March 19, 2013 10:42 AM
> To: Tony Singh
> Cc: Cisco certification
> Subject: Re: VPC layer 2 extension between data centers
>
> I 'd like the real experience rather than documents. In paper, STP runs well too, but in reality, I knows nobody using it for redundancy between datacenters.
>
> Thanks for sharing,
>
> Viet
>
> On 03/19/2013 04:38 PM, Tony Singh wrote:
>> also would highly recommend Brian's DC videos on such topics
>>
>> :)
>>
>> On 19 March 2013 15:33, Viet-Hung TON <vton_at_integra.fr> wrote:
>>> thanks for sharing!
>>>
>>> Viet
>>>
>>>
>>> On 03/19/2013 04:32 PM, Tony Singh wrote:
>>>> here's a good article
>>>>
>>>> http://www.netcraftsmen.net/blogs/vpc-best-practices-checklist.html
>>>>
>>>>
>>>> BR
>>>>
>>>> Tony
>>>>
>>>> On 19 March 2013 15:16, 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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>>>>>
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Received on Tue Mar 19 2013 - 11:17:36 ART