RE: IUnicast drop in Nexus

> Having two pairs of 5000 with vPCs between them is not, to the best of my knowledge, a standard design, is it ?

You can, it's called double-sided vPC or back-to-back vPC. If it's configured wrong though you can have strange failure and convergence issues, which could be the problem in this case. Either way 200ms is still pretty good for convergence. Narottam do you have peer-switch configured on both the upstream and downstream vPC peers?

Brian McGahan, CCIE #8593 (R&S/SP/Security)
bmcgahan_at_INE.com
 
Internetwork Expert, Inc.
http://www.INE.com

-----Original Message-----
From: Carlos G Mendioroz [mailto:tron_at_huapi.ba.ar]
Sent: Sunday, December 23, 2012 5:42 PM
To: Brian McGahan
Cc: Narottam Prajapati; Cisco certification
Subject: Re: IUnicast drop in Nexus

I guess LACP should run on top and take care of a downed link from one side perspective, and some kind of peer link keepalive take the other side. Having two pairs of 5000 with vPCs between them is not, to the best of my knowledge, a standard design, is it ?

There's a nice list of things to check by Pete Welcher at http://www.netcraftsmen.net/component/content/article/69-data-center/1260.html,
including references to enhanced vPC (two level vPC via 2k FEXes)

-Carlos

Brian McGahan @ 23/12/2012 19:30 -0300 dixit:
> vPC doesn't mean fast reconvergence it just means active/active forwarding. There are other issues in your design/config that can affect convergence.
>
> If you want more specific help post your sanitized diagrams and configs.
>
> HTH,
>
> Brian McGahan, CCIE #8593 (R&S/SP/Security) bmcgahan_at_INE.com
>
> Internetwork Expert, Inc.
> http://www.INE.com
>
> On Dec 23, 2012, at 11:43 AM, "Narottam Prajapati" <narottam26_at_gmail.com> wrote:
>
>> HI All
>>
>> I am facing one issue with VPC configuration in nexus. While
>> reloading VPC primary switch I am getting drop in Ping. My topology
>> is like. All 4 switches configured as full mesh toplology.
>>
>> There is two side VPC configuration One VPC 10 configured between
>> Switch A and VPC 20 Configured Between SWITCHC and SWITCHD. All
>> Swithces are physically configured in full mesh topology.
>>
>> Host X connected with Switch C and Host Y connected with switch D.
>> Switch A and Switch B are Root configured with the same priority.
>>
>> While Reload VPC operational Primary switch of A and B I am getting
>> ICMP drop for 200 milisecond which is monitored in wireshark.
>>
>> So please help me to rectify it how can i resolve this issue and any
>> technic fot troubleshooting this senario.
>>
>> Regards,
>> N.P
>>
>>
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--
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net