Connecting Cisco 6800 VSS to Nexus 5K vpc pair

We have a pair of Nexus 5K connected together as with vcp.  We have 2 6800s connected together as VSS.  The 6800 will be our core eventually.  

We want to connect the 6800s to the 5Ks.   The idea is to take 1 port from each of the 6800s and connect them to one of the 5ks in an MEC.  Then take another port from each of the 6800s and connect them to the other 5K in an MEC.  

I am reading some conflicting information that on the 5ks I can just build the associated port-channels as would be typical of any switch and not lend any concern to the fact that vpc exist.  I'm OK with that I guess.

Yet other documentation I am reading suggest to instead of building two MECs from the 6800, build only one with the 4 ports included and then on the 5Ks build a port-group on each for the connections that go to each of the 6800 and assign those port-groups to a vpc of the same ID.

I can kind of see that the latter of these options seems to allow the 6800 VSS to see the 5Ks as one switch and at the same time allow the 5Ks to see the 6800 VSS as one switch -- which of course is standard fare.  

I would like to hear from anyone that may have done the same type of project or from any experts that can shed some light on the pros, cons and/or validity of these approaches.

Thank you,

Scott
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Don JohnstonInstructorCommented:
We want to connect the 6800s to the 5Ks.   The idea is to take 1 port from each of the 6800s and connect them to one of the 5ks in an MEC.  Then take another port from each of the 6800s and connect them to the other 5K in an MEC.  
That would be how I would do it. No muss, no fuss. Just plain old port channels.
Yet other documentation I am reading suggest to instead of building two MECs from the 6800, build only one with the 4 ports included and then on the 5Ks build a port-group on each for the connections that go to each of the 6800 and assign those port-groups to a vpc of the same ID.
You could do that.  Basically it's like Back-to-Back vPC.  It's done all the time... As long as you're comfortable with vPC.

Personally, I like option 1.  It keeps all your eggs out of one basket.  But in reality, it's six of one, half a dozen of the other.

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