[cisco-voip] CCM and QOS

[Nick Griffin]

Another possibility is that the 3550's use FIFO queueing on the ingress, that could be a reason why you are seeing this. As Ronald mentioned make sure mls qos is enabled, and your COS to DSCP and DSCP to COS Mappings are correct, since you used autoqos you should be fine.


-----Original Message-----
From: cisco-voip-bounces at puck.nether.net on behalf of Ronald Heitmann
Sent: Fri 7/1/2005 9:38 AM
To: Phillips, Danny
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] CCM and QOS
 
Hi Danny,

the displayed "queuing type: fifo" has no relevance, since the 
Catalyst-Switch(es) use hardware-based forwarding/queuing with WRR- or 
SRR-strategy. You're config should work fine, if "mls qos" is enabled 
globally!
Choosing another software-queuing strategy (fair-queue, 
priority-queuing, custom-queuing, llq, etc.) will have no effect since 
there is no software-queuing in these boxes. It seems like cisco has 
forgotten to remove some cli-stuff while porting the ios-code from the 
router platform.

Regards,
//Ronald

Phillips, Danny schrieb:

> Below is the settings on my 3550 when I turned on "auto QOS". When I 
> look at the interface using the show interface command, the queuing 
> says that it is fifo. My question is should I turn this off using the 
> "fair-queue" command?
>
> interface FastEthernet0/1
>
> switchport trunk encapsulation dot1q
>
> switchport trunk native vlan 31
>
> switchport trunk allowed vlan 31,231
>
> switchport mode trunk
>
> switchport voice vlan 231
>
> mls qos trust device cisco-phone
>
> mls qos trust cos
>
> auto qos voip cisco-phone
>
> wrr-queue bandwidth 10 20 70 1
>
> wrr-queue min-reserve 1 5
>
> wrr-queue min-reserve 2 6
>
> wrr-queue min-reserve 3 7
>
> wrr-queue min-reserve 4 8
>
> wrr-queue cos-map 1 0 1
>
> wrr-queue cos-map 2 2 4
>
> wrr-queue cos-map 3 3 6 7
>
> wrr-queue cos-map 4 5
>
> priority-queue out
>
> spanning-tree portfast
>
> spanning-tree bpduguard enable
>
> end
>
> Danny
>
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>
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