I have a query re QoS settings on a 3560 switch. The switch has PCs and VOIP phones attached.
The 3560 is configured with what is a basically an AutoQos config. The dscp mappings, queue thresholds etc are all there in the 'sh run'. However, a 'sh mls qos queing interface f0/1' ( f0/1 is the main uplink port) returned the following:
Egress Priority Queue : disabled
Shaped queue weights (absolute) : 25 0 0 0
Shared queue weights : 25 25 25 25
The port bandwidth limit : 100
The port is mapped to qset : 1
This concerned me. With VOIP I would have expected the priority queue here to be enabled. It isn't. The weights are all equal too.
Can anyone tell me if this is a matter of concern - should I enable the Egress Priority Queue?
It's not really auto-qos, it's ripped off an auto qos config on another switch. I don't think the auto qos voip trust command is applicable here as it's an uplink port.
My question now is - if I setup a priority queue on f0/1 how will this affect the values set in the 4 output queues defined in the global qos config? (There is no reference to a priority queue in this global QoS config)
So this config does a lot of mapping of cos values to queues and thresholds, but it doesn't actually configure the bandwidth queuing ratios on the interfaces. To do that, you need the interface commands I provided above.
The "auto qos voip trust" interface command is actually designed for an interface to another trusted device, i.e. a switch uplink or a router. So it would make sense to use it on this link.
As I mentioned, another easy way to apply best practice configuration to the uplink interface would be the cisco-switch smartports macro:
macro apply cisco-switch $native_vlan
That command macro actually includes auto qos voip trust as a subcommand.
One thing to add to Ryan's post is you might also need to add mls qos trust dscp (defaults to trusting cos). Like Ryan stated it depends on your interface config (and in this case the phone/trust point).
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
Im studying the 100-105 book by Odom and am currently on the topic of Port security. I purchased a used 2960 and I'm trying to follow a...
While deploying a number of 18xx/2802/3802 model access points (APs), which run AP-COS as their operating platform. It can be observed on some occasions that while many of their access points were able to join the fabric WLC withou...
I am going to design and build an LAN network under a tunnel underground with long distance between the switches.
I will have 2 Catalyst switches and 8 Industrial IE3000, and they will be connected with fiber.
For now I am planning on use Layer-2 s...