qos priority-to-pg

Configures priority-to-priority-group (PG) mapping for priority flow control (PFC).
Syntax
qos priority-to-pg qosp0 priority-PG-map qosp1 priority-PG-map qosp2 priority-PG-map qosp3 priority-PG-map qosp4 priority-PG-map qosp5 priority-PG-map qosp6 priority-PG-map qosp7 priority-PG-map
no qos priority-to-pg
Command Default

Priority-to-PG mapping is not configured.

Parameters
qosp0 through qosp7
Configures the internal priority based on classification in the range 0 through 7.
priority-PG-map
Specifies the internal priority-to-PG mapping. The range is from 0 through 3.
Modes

Global configuration mode

Usage Guidelines

This command is supported only on RUCKUS ICX 7250, ICX 7750, and ICX 7450 devices. This command is not supported on RUCKUS ICX 7150 or ICX 7650 devices.

You must configure the priority-flow-control enable command to enable PFC globally before you configure priority-to-PG mapping.

Note: Default mapping, mapping priorities, and mapping restrictions changed in FastIron Release 08.0.20. The following restrictions apply:

  • Priority 7, and only Priority 7, is always mapped to PG4.
  • PG4 is always lossy.
  • PFC cannot be enabled on PG4.
  • Priorities 0 through 5 can be mapped to PG0, PG1, and PG2. They cannot be mapped to PG3 or PG4.

The default values of priority-to-PG maps:

  • QoS internal priority 0 is mapped to PG 0
  • QoS internal priority 1 is mapped to PG 0
  • QoS internal priority 2 is mapped to PG 1
  • QoS internal priority 3 is mapped to PG 1
  • QoS internal priority 4 is mapped to PG 1
  • QoS internal priority 5 is mapped to PG 2
  • QoS internal priority 6 is mapped to PG 2
  • QoS internal priority 7 is mapped to PG 4

The default values of priority-to-PG maps in releases prior to Release 08.0.20:

  • QoS internal priority 0 is mapped to PG 0
  • QoS internal priority 1 is mapped to PG 0
  • QoS internal priority 2 is mapped to PG 1
  • QoS internal priority 3 is mapped to PG 1
  • QoS internal priority 4 is mapped to PG 1
  • QoS internal priority 5 is mapped to PG 2
  • QoS internal priority 6 is mapped to PG 2
  • QoS internal priority 7 is mapped to PG 2

In releases prior to Release 08.0.20, you can map QoS internal priority 7 to PG 3. You can also map any other priority to PG 3 if it meets the following requirements:

  • Lower priorities are mapped to lower PGs.
  • PGs are configured in ascending order.
  • Multiple priorities in a single PG must be consecutive.

Priority-to-PG mapping is not configurable in other modes. Symmetrical and asymmetrical 802.3x flow control modes have their own default priority-to-PG mapping.

You must configure PGs in ascending order, 0 to 3. You can configure a higher-order PG only if all the lower-order PGs have some mapped priorities.

The no form of the command restores the default priority-to-PG map.

Examples

The following example configures a priority-to-PG map. 

Device(config)# priority-flow-control enable
Device(config)# qos priority-to-pg qosp0 0 qosp1 1 qosp2 1 qosp3 1 qosp4 2 qosp5 2 qosp6 2 qosp7 4

The following example restores the default priority-to-PG map. 

Device(config)# no qos priority-to-pg qosp0 0 qosp1 1 qosp2 1 qosp3 1 qosp4 2 qosp5 2 qosp6 2 qosp7 4
History
Release version Command history
08.0.10 This command was introduced.
08.0.20 This command was modified to change priority 7-to-PG4 mapping and mapping restrictions for priorities 0 through 5.
08.0.60 Added a usage guideline concerning the support of this command and that this command is not supported on the RUCKUS ICX 7150.
08.0.70 Added a usage guideline concerning the support of this command and that this command is not supported on the RUCKUS ICX 7650.
Parent topic: Commands O, P, Q, R, and Sa through Sh