06-07-2010 01:05 PM - edited 03-06-2019 11:27 AM
I have upgraded a Cisco 4506 with a Supervisor 4 to a Supervisor 6-E and low & behold, my CoS/QoS settings no longer work. I see from a white paper that Cisco upgraded the supervisor capabilities to MQC, which is more inline with the IOS routers. There are a couple differences though. Does anyone have any links or other tips that is not covered in white paper?
I'm having a hard time converting my previous 4500 QoS settings for voice (Avaya phones) to the new syntax on the Supervisor 6-E. I used a Cisco Press book called End-to-End QoS Network Design, but being a few years old it doesn't include the latest Sup 6 from the 4500's.
06-07-2010 01:58 PM
As you stated, it uses the same methodology as the routers and it's much easier to deploy. By default all switchports are trusted and markings will be preserved unlike your typical QoS on Cisco switches.
The documentation has good information on this matter:
Regards
Edison
06-08-2010 07:49 AM
I'm reading it now, but I still don't understand a couple things.
1) Table maps are not explained. How do I know if I am changing CoS or DSCP?
2) If I apply a policy to a VLAN, does it affect every L2 switchport on that VLAN? Or only when it flows through the L3 vlan interface? (behavior similar to a router)
06-09-2010 10:05 AM
I also don't understand what qos-groups are and why they are needed.
After initiating auto-qos on a port, the exerpt below was configured on the switch. I don't use auto-qos personally, but it does give insight into the functionality.
Notice the redundancy between dscp24/26 and qos-group24/26. Why??
03-19-2012 09:05 AM
Hi,
Just wondered if someone would be able to explain the qos groups are as I don't understand it myself. I've tried reading the documentation but it doesn't seem to explain it very well.
Thanks
Darren
09-09-2013 01:57 AM
A Qos-group is an internal marker, just like the old "internal DSCP" was; but qos-group may be used if all the traffic embedded into a class is not IP-based.
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