[c-nsp] Nexus / Fexs

[scott owens]

Tony,

You replied a little down in this thread and rather than cutting it up I put
my text down there too.


> >
> > Read this as well ( it talks about NOT using the mgmt0 for peer keep
> > alives
> > ) - we are trying this too
> >
> >
> http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/layer2/Cisco_Nexus_5000_Series_NX-OS__chapter8.html
> >
> > After figure 6, step 3 there is this text ;
> > Note
> > VLAN 900 must not be trunked across the vPC peer-link because it carries
> > the vPC
> > peer-keepalive messages. There must be an alternative path between
> > switches NX-5000-1 and
> > NX-5000-2 for the vPC peer-keepalive messages.
> >
> > The problem we are encountering is that if we drop the peer vlan from
> > the 5k to 5k link then we get weird errors as well.
> >
> >
> >
> > I will STRONGLY suggest that you test any possible failure scenario that
> > you
> > can think of.
> > Are you using the 5Ks/ FEXs in dual homed fashion ?
> >
> > I have an open case with Cisco on the use of
>
> I didn't respond to all of your questions comments.
>
> We never put the keepalive vlan across the peer link.  It's always in its
> own VRF in whatever fashion/implementation on the 5k and 7k.
>
> If you have an OOB network that requires the 5k mgmt0 ports to be used
> there, burn one of 1-8 on a 5010 or one of 1-16 on a 5020 as a gig port and
> do another VRF specially for the peer link.  Done.
>
> Yes, most of our customers are dual connected.
>
> We've done a lot of testing.  But, we have not done what you have.  It's
> not
> the recommended practice, it's not the correct design and no one around
> Cisco supports it.  So, we don't implement that way.
>

I am not sure I understand what you are saying is not recommended - dual
connected FEXes ?
Sure they are supported and recommended, their use is the first vPC option
shown on page 98 of the 4.2(1)N1(1) Layer 2 Switching Conf Guide and it is
essentially the same as in the past 3 revs.

Scott


> I know the docs (all 10000 of them) may seem confusing and contradictory.
> But, if you follow above you shouldn't have any issues.
>
> tv
>
>
>
>