[c-nsp] N7K QoS with FEXes

[Tóth András]

The four ports on the Cisco Nexus 7000 Series switch that connect to the
uplink ports are fabric ports. Only QoS policies can be configured on the
server-facing FEX ports. Currently, queuing on the FEX interfaces is not
supported.

http://www.cisco.com/en/US/docs/switches/datacenter/sw/6_x/nx-os/qos/configuration/guide/overview.html

Since it's not possible to apply QoS config on the FEX fabric ports, by
applying DSCP marking on the FEX host ports, packets ingressing on those
ports will retain the DSCP value while going to the parent N7k. In any
case, you might want to confirm with a SPAN capture.

Best regards,
Andras


On Mon, Jan 14, 2013 at 4:26 PM, Pavel Vraštiak <vrastiak at selfservis.cz>wrote:

> Hi list,
> suppose you have two n7ks (F2 modules) connected to each other (vpc) and
> several FEXes directly connected to them. Now, is it neccesary/possible to
> configure any qos-related stuff on the link between fex and n7k? I was not
> successful with that. I read somewhere that there are pause frames which
> push congestion to other links.
>
> Would setting DSCP values on ingress n2ks and prioritizing traffic on
> egress from n7k based on these DSCP values be sufficient and working as
> expected?
>
> I mean, I found tons of stuff on that for n5k/n2ks, but n7k is way too
> different.
>
> Paul
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