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Is Cisco UCS tagging frames with "EF"

Is Cisco UCS tagging frames with "EF"

(OP)
All - This might be more of a network question, but I thought I'd start here.

The question: Does Cisco UCS - or it's own endpoints - mark it's traffic with Expedited Forwarding by default, or is that done only on the network equipment? I think that I've answered my own question, and that is Yes - UCS does mark it's own traffic.

The backstory: I'm in the process of moving our UCS VM-Host from an old HP to a Cisco fabric extender switch, off a Nexus 9k. We've got a QoS service policy on our network for VoIP traffic. I can't add the QoS service policies to the 9k, which could muck up the migration.

A ticket was opened with Cisco, and they said: "Cisco said + N9K doesn’t change any UCS/Endpoint’s QOS DSCP value by default. E.g. If endpoint marks the traffic with EF (DSCP 46, IP precedence 5). N9K will pass the traffic as EF."

So - the key word there is "IF". Given that there is no question mark at the end of that sentence, I'm thinking what they meant was, "When endpoint marks the traffic". The access-layer equipment in-between already has QoS policies on the switchport, so I think they're already tagging. If that's the case, the Nexus 9k will just forward on the traffic with the tagging intact.

Does anyone off-hand if I'm right or totally wrong?

RE: Is Cisco UCS tagging frames with "EF"

Not entirely sure about the UCS itself but CM tags its packets.

Certifications:
A+
Network+
CCENT
CCNA Voice
TVOICE
CAPPS
CIPTV1
CIPTV2

RE: Is Cisco UCS tagging frames with "EF"

Cant you do a copy of the vm and test it first in an isolated place instead of switch and let's hope the best of it?

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