[AusNOG] Assistance with Cisco vPC configuration on 4 x Cisco Nexus 3000 switches

[Jason Leschnik]

Hi Radek,

Few questions/comments:

   - Are the 3064's acting as some type of core here?
   - What's the wider topology look like?
   - Without vPC on SW13/14 you will be missing out on the chance to
   back-to-back vPC these and turn those 4 links into a single logical link
   - Generally if you don't expect to see much traffic asymmetry (most
   downstream ports will be in vPC) in the network you can skip the 40 Gbps
   peer-link and use them links downstream/upstream connectivity
      - In a well designed network we are active-active to both 3k,
      failures of links will cause traffic to traverse the peer-link
but we don't
      expect as much as going south->north

By no means am I a design expert, I just know a little about Nexus =)

Regards,
Jason.

On Sun, 25 Nov 2018 at 17:36, Radek Tkaczyk <radek at tkaczyk.id.au> wrote:

> Hi Jake,
>
> That’s something that I wanted to check if it was needed/recommended.
>
> Can certainly put it in if it will help achieve better performance and
> redundancy
>
> Thanks
>
> Radek
>
> On 25 Nov 2018, at 4:26 pm, Jacob Taylor <me at jacobtaylor.id.au> wrote:
>
> Hi Radek,
>
> Not personally familiar with vPC, more so Arista MLAG and Juniper MC-AE.
>
> In the diagram there isn’t a peer link between 13 & 14 - is that a mistake
> in the diagram or the actual design?
>
> If you intend to build 2x20G bonds to two standalone nexus switches,
> that’ll work fine.
>
> If you are trying to achieve a 40G bowtie between the two pairs I’m fairly
> certain that won’t work (unless Cisco has some special black magic to
> transport signalling/MAC synchronisation over the bond itself).
>
> Cheers,
> Jake
>
>
>
> On 25 Nov 2018, at 15:04, Radek Tkaczyk <radek at tkaczyk.id.au> wrote:
>
> Hi Guys,
>
>
>
> I have a need to configure vPC on 4 x Cisco Nexus 3000 switches at one of
> our data centres – a design that we will replicate to other data centres as
> well.
>
>
>
> I think I have the config down pat, but I’d like someone with another pair
> of eyes to go over it with me to ensure it’s 100% correct.
>
>
>
> Is there anyone who can give me a hand here with this configuration, happy
> to pay for someone’s time to go over it to ensure we are doing this
> correctly.
>
>
>
> The Physical setup that I’m looking for:
>
>
>
>
>
> <image001.png>
>
>
>
> Thanks
>
>
>
> Radek
>
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