Contact US

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Is Cisco UCS tagging frames with "EF"

Is Cisco UCS tagging frames with "EF"

Is Cisco UCS tagging frames with "EF"

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.

CCNA Voice

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?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close