Re: Is it possible to apply Priority queue on 6509 running sup 720

carl_townshend · ‎02-01-2018

Hi All

I wanted to enable a priority queue on my 6509 for my voice traffic, however when I apply the policy map to the interface it fails.

Can anyone tell me how I can do it?

cheers

Joseph W. Doherty · ‎02-01-2018

QoS on a 6500 depends much on what's installed in the chassis. Most line cards, at least those not really old, support a PQ, using the 1st Q.

How QoS is configured, and enabled, also varies per sup and line cards. Most do not use policy maps for egress queue configuration.

carl_townshend · ‎02-01-2018

Hi
Have you got a typical example of how to set up the priority queue?

Mark Malone · ‎02-02-2018

Hi

So one of my modules running on 6509-E WS-X6148A-GE-45AF is set like below and once the qos is put in the queues alter , so p queue is 4 and you see cos 5 for voice is in priority queue 4

interface GigabitEthernet1/6
switchport
switchport access vlan 157
platform qos trust cos
wrr-queue bandwidth 20 100 200
wrr-queue queue-limit 65 15 15
wrr-queue random-detect min-threshold 1 70 100 100 100 100 100 100 100
wrr-queue random-detect min-threshold 2 70 100 100 100 100 100 100 100
wrr-queue random-detect min-threshold 3 40 40 50 50 60 60 70 70
wrr-queue random-detect max-threshold 1 100 100 100 100 100 100 100 100
wrr-queue random-detect max-threshold 2 100 100 100 100 100 100 100 100
wrr-queue random-detect max-threshold 3 70 70 80 80 90 90 100 100
wrr-queue cos-map 2 1 1 2
wrr-queue cos-map 3 5 3 4
wrr-queue cos-map 3 7 6 7
auto qos voip trust
spanning-tree portfast edge
spanning-tree cost 3019
ip dhcp snooping limit rate 7

xxxxxxxxx#SH QUEUeIng INTerface G1/6
Interface GigabitEthernet1/6 queueing strategy: Weighted Round-Robin

Port QoS is enabled globally
Queueing on Gi1/6: Tx Enabled Rx Enabled

Trust boundary disabled

Trust state: trust COS
Trust state in queueing: trust COS
Extend trust state: not trusted [COS = 0]
Default COS is 0
    Queueing Mode In Tx direction: mode-cos
    Transmit queues [type = 1p3q8t]:
    Queue Id    Scheduling Num of thresholds
    -----------------------------------------
       01         WRR                 08
       02         WRR                 08
       03         WRR                 08
       04         Priority            01

    WRR bandwidth ratios:   20[queue 1] 100[queue 2] 200[queue 3]
    queue-limit ratios:     65[queue 1] 15[queue 2] 15[queue 3] 15[Pri Queue]

    queue tail-drop-thresholds
    --------------------------
    1     70[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]
    2     70[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]
    3     100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

    queue random-detect-min-thresholds
    ----------------------------------
      1    70[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]
      2    70[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]
      3    40[1] 40[2] 50[3] 50[4] 60[5] 60[6] 70[7] 70[8]

    queue random-detect-max-thresholds
    ----------------------------------
      1    100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]
      2    100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]
      3    70[1] 70[2] 80[3] 80[4] 90[5] 90[6] 100[7] 100[8]

    WRED disabled queues:

    queue thresh cos-map
    ---------------------------------------
    1     1      0
    1     2
    1     3
    1     4
    1     5
    1     6
    1     7
    1     8
    2     1      1 2
    2     2
    2     3
    2     4
    2     5
    2     6
    2     7
    2     8
    3     1
    3     2
    3     3
    3     4
    3     5      3 4
    3     6
    3     7      6 7
    3     8
    4     1      5

    Queueing Mode In Rx direction: mode-cos
    Receive queues [type = 1q2t]:
    Queue Id    Scheduling Num of thresholds
    -----------------------------------------
       1         Standard            2

    queue tail-drop-thresholds
    --------------------------
    1     80[1] 100[2]

    queue thresh cos-map
    ---------------------------------------
    1     1      0 1 2 3 4
    1     2      5 6 7

Packets dropped on Transmit:
    BPDU packets: 0

    queue thresh             dropped [cos-map]
    ---------------------------------------------------

    1     1                       0 [0 ]
    2     1                       0 [1 2 ]
    3     5                       0 [3 4 ]
    3     7                       0 [6 7 ]
    4     1                       0 [5 ]

Packets dropped on Receive:
    BPDU packets: 0

    queue thresh              dropped [cos-map]
    ---------------------------------------------------
    1     1                       0 [0 1 2 3 4 ]
    1     2                       0 [5 6 7 ]

Joseph W. Doherty · ‎02-02-2018

A key piece of what Mark has posted is:

Transmit queues [type = 1p3q8t]:

Different line cards support QoS architectures, so you need to adjust the parameters for the differences.

To your original question about PQ, for card architectures, look for "1p" as the first term. Again, unless you're using a really old 6500 line card, a line card should support a PQ queue.