2960 priority-queue out

[bchostner]

Hi All,

I need CS5 and EF (DSCP 40 and DSCP 46) to be expidited outbound on the 2960 switchport. Data traffic is default DSCP 0. I dont want to use a class map or policy map  on the interface. I just want all of the rtp traffic expidited, the simpler the better.

Question: By default what traffic goes in the 2960 egress priority-queue?

Question: If none, what is the best way to assign a DSCP  40 and 46 to the 2960 egress priority-queue?

Question: Is this the best way to configure VoIP for a non Cisco phone with PC connected.? I dont think I should use "auto qos voip trust"

Here is my config:

C2960-LANBASEK9-M), Version 12.2(35)SE

!

Vlan 10

name Data

!

Vlan 90

name VoIP

!

mls qos

mls qos map cos-dscp 0 8 16 24 32 40 46 56

!

interface FastEthernet0/0

 description Router

 switchport mode trunk

 speed 100

duplex full

mls qos trust dscp

priority-queue out

spanning-tree portfast trunk

no shut

!

interface range f0/1 – 24

description Users

duplex auto

speed auto

switchport mode access

switchport access vlan 10

switchport voice vlan 90

switchport priority extend cos 0

Thanks!

Brian

[andrew.prince]

Read the below link - it will tell you all you need to know..

http://www.cisco.com/univercd/cc/td/doc/solution/esm/qossrnd.pdf

HTH>

[bchostner]

This is the config that I came up with to prioritize the nortel phone voip traffic. Enjoy!

mls qos 

Maps cs6 to dscp 46 (EF) 

mls qos map cos-dscp 0 8 16 24 32 40 46 56 

Puts EF in the priority ingress queue, with dscp 40 lower priority.

mls qos srr-queue input dscp-map queue 2 threshold 3  46

mls qos srr-queue input dscp-map queue 2 threshold 2  40

Puts dscp default traffic in the second ingress queue.

mls qos srr-queue input dscp-map queue 1 threshold 3  0

Puts cs5 in the priority ingress queue. May not be needed if not trusting cos, but cant hurt?

mls qos srr-queue input cos-map queue 2 threshold 3  5 

Puts cos0 default traffic in the second ingress queue.

mls qos srr-queue input cos-map queue 1 threshold 3  0

Puts cos0 default traffic in the fourth egress queue.

mls qos srr-queue output cos-map queue 4 threshold 3  0 

Puts cs5 in the priority egress queue. May not be needed if not trusting cos, but cant hurt?

mls qos srr-queue output cos-map queue 1 threshold 3  5 

Puts EF in the priority egress queue, with dscp 40 lower priority.

mls qos srr-queue output dscp-map queue 1 threshold 3  46

mls qos srr-queue output dscp-map queue 1 threshold 2  40 

Puts dscp default traffic in the fourth egress queue.

mls qos srr-queue output dscp-map queue 4 threshold 1  0

!

Vlan 10

name Data

!

Vlan 90

name VoIP

!

!

interface range f0/1 – 24

duplex auto

speed auto

switchport mode access

switchport access vlan 10

switchport voice vlan 90

priority-queue out

mls qos trust dscp

spanning-tree portfast

no shut

!

[lgijssel]

Hi Brian,

A few remarks:

- EF is indeed mapped to the priority queue by default.

Use " show mls qos map" to verify this.

- You have to activate some kind of trust (cos or dscp) on the ingress ports where the phones are connected.

When this is omitted, all traffic will be classified as data (cos 0 / dscp 0)

- I would use the auto qos features because this also provides appropriate queue settings

Do it like this:

int fa0/1-24

auto-qos voip trust

mls qos trust dscp

regards,

Leo