QoS queue configuration

QoS queue configuration allows you to reduce the number of outbound queues that all switch ports will use to buffer packets for 802.1p user priorities. By default, there are four priority queues or traffic classes. Using this feature, you can reconfigure the switch to eight-queue mode, or two-queue mode, to increase the available bandwidth per queue.

Use the following commands to change the number of queues per port and display the current priority queue configuration on the switch.

Syntax:

qos queue-config < 2-queues | 4-queues | 8-queues>

Configures the number of outbound priority queues for all ports on the switch using one of the following options: 2-queues, 4-queues, or 8-queues.

(Default: 8-queues)

CAUTION: This command will execute a write memory followed by an immediate reboot, replacing the Startup configuration with the content of the current Running configuration.

The new configuration will:

Remove any previously configured bandwidth-min output settings

Set the new number of outbound port queues

If you select anything but ‘yes’ for this operation, the operation is aborted and a message stating Operation aborted appears.

Syntax:

show qos queue config

Displays the current qos queue configuration.

Mapping of outbound port queues

This table shows the mapping of 802.1p priorities to outbound port queues:

Mapping 802.1p priorities to outbound port queues

802.1p priority	8 Queues (default)	4 Queues	2 Queues
1 (lowest)	1	1	1
2	2	1
0 (normal)	3	2
3	4	2
4	5	3	2
5	6	3
6	7	4
7 (highest)	8	4

Configuring the number of priority queues

To change the number of outbound priority queues for all ports on the switch, use the qos queue-config command.


	CAUTION: The `qos queue-config` command executes a `write memory` followed by an immediate reboot, replacing the Startup configuration with the contents of the current Running configuration.

Example:

To change the number of outbound priority queues for all ports on the switch from four queues (the default) to two:

Specify the number of outbound priority queues to be configured using the qos queue-config command.
```
HP Switch(config)#: qos queue-config 2-queues
```
A caution message is displayed (see the Caution note above) concluding with the following prompt:
```
Do you wish to proceed? [Proceed/Cancel]
```
Type Proceed to continue.

A second confirmation prompt appears:
```
Please confirm reset. [Yes/Cancel]
```
Type Yes to initiate a write memory followed by an immediate reboot. (If you enter Cancel at either of the two prompts, the command is aborted and the current queue configuration is maintained on the switch).

The changes will be committed to the startup configuration and the switch will reboot automatically with the new priority queue changes in effect.

Viewing the QoS queue configuration

Syntax:

show qos queue-config

Displays the current priority queue configuration and memory allocations per queue.
Viewing QoS queue configuration
HP Switch(config)#: show qos queue-config

 Outbound Port Queue Configuration

         802.1p
 Queue  Priority  Memory %
 -----  --------  --------
   1      1-3        30
   2      0,3        70

QoS port egress-queue drop counters

Port egress-queue drop counters help customers debug network behavior and performance issues.

Egress-queue drop counters can be used to detect congestion on outbound ports, and help troubleshoot the network. The additional status display by this command show egress port-queue drop and transmits, the sum of which should be all traffic intended for the outbound port.

Syntax:

Show port configuration and status information.

show interfaces ...

show interface queues a1
Status and Counters - Port Counters for port A1

Name  : 
MAC Address      : a01d48-8f99ff
Link Status      : Down
Port Totals (Since boot or last clear) :

Rx Packets      : 0                  Tx Packets      : 0
Rx Bytes        : 0                  Tx Bytes        : 0
Rx Drop Packets : 0                  Tx Drop Packets : 0
Rx Drop Bytes   : 0                  Tx Drop Bytes   : 0

Egress Queue Totals (Since boot or last clear) :
Tx Packets      Dropped Packets  Tx Bytes         Dropped Bytes
Q1 123456789012    123456789012     123456789012     123456789012
Q2 12345678        12345678         12345678         12345678 
Q3 1234            1234             1234             1234  
Q4 0               0                0                0

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	CAUTION: This command will execute a `write memory` followed by an immediate reboot, replacing the Startup configuration with the content of the current Running configuration.