Access egress QoS policy for port-based queuing mode

Note:

The port-based queuing mode is supported on IMM-b and IMM-c cards. On IMM-c cards, it is the default and the only supported queuing mode.

When port-based queues are enabled in addition to marking values, the access egress QoS policy provides an option to define port-based queues and scheduling.

Users have an option to use either port-based egress queuing and shaping or SAP-based egress queuing and shaping for SAPs configured on access ports or hybrid ports. The config system global-resource-profile qos port-scheduler-mode command allows users to select the mode used for SAPs configured on all the ports of the node (this is a per-node setting). When port-scheduler-mode is enabled, the software uses eight egress queues per access port, and all the SAPs configured on the port share the eight egress queues for traffic sent out of that port.

When port-scheduler-mode is enabled, the queue parameters for the access port egress queues are defined using the access egress policies.

Modify queue parameters for a specific queue using the queue override feature. See QoS overrides for meters/policers for more information.

Additionally, the marking values used to mark traffic from different FCs are defined by the remark policy in the access egress policy. Per-SAP marking cannot be used when port-based queuing mode is used. See Access egress QoS policies for 7210 SAS-Mxp, 7210 SAS-R6, and 7210 SAS-R12 for more information about marking behavior with different remark policy types.

Access egress QoS policies define egress queues and map FC flows to queues, if port-scheduler-mode is enabled. Using port-scheduler-mode, the system allocates eight queues to access port egress by default. To define a basic access egress QoS policy, the following are required:

See Queue parameters for information about the parameters that can be configured for a queue.

Optional service egress QoS policy elements include the following:

When port-based queuing is used, the FC-to-queue map is fixed and the queue priority is determined by the queue number, with higher queue numbers having the higher priority. The user can configure a queue to be a strict queue to change the scheduling behavior for the queue.

Access egress QoS policy ID 1 is reserved as the default access egress policy. The default policy cannot be deleted or changed. The default access egress policy is applied to all access ports that do not have another access egress policy explicitly assigned. By default, sap-qos-marking is enabled. Table: Default access egress QoS policy ‟default” definition for 7210 SAS-R6 and 7210 SAS-R12 and Table: Default remarking policy for dot1p on 7210 SAS-R6 and 7210 SAS-R12 list the characteristics of the default policy.

Table: Default access egress QoS policy ‟default” definition for 7210 SAS-R6 and 7210 SAS-R12
Characteristic Item Definition

Network-Control (nc)

Queue 8

  • CIR = 0

  • PIR = max

  • queue-mgmt = default

  • queue-mode = weighted

  • weight = 1

High-1 (h1)

Queue7

  • CIR = 0

  • PIR = max (line rate)

  • queue-mgmt = default

  • queue-mode = weighted

  • weight = 1

Expedited (ef)

Queue 6

  • CIR = 0

  • PIR = max (line rate)

  • queue-mgmt = default

  • queue-mode = weighted

  • weight = 1

High-2 (h2)

Queue 5

  • CIR = 0

  • PIR = max (line rate)

  • queue-mgmt = default

  • queue-mode = weighted

  • weight = 1

Low-1 (l1)

Queue 4

  • CIR = 0

  • PIR = max (line rate)

  • queue-mgmt = default

  • queue-mode = weighted

  • weight = 1

Assured (af)

Queue 3

  • CIR = 0

  • PIR = max (line rate)

  • queue-mgmt = default

  • queue-mode = weighted

  • weight = 1

Low-2 (l2)

Queue 2

  • CIR = 0

  • PIR = max (line rate)

  • queue-mgmt = default

  • queue-mode = weighted

  • weight = 1

Best-Effort (be)

Queue 1

  • CIR = 0

  • PIR = max (line rate)

  • queue-mgmt = default

  • queue-mode = weighted

  • weight = 1

The marking values used to mark traffic from different FCs are defined by the remark policy in the access egress policy. The following table lists the remarking policy for type dot1p for the 7210 SAS-R6 and 7210 SAS-R12.

Table: Default remarking policy for dot1p on 7210 SAS-R6 and 7210 SAS-R12
FC In-profile Out-profile

Network-Control (nc)

7

7

High-1 (h1)

6

6

Expedited (ef)

5

5

High-2 (h2)

4

4

Low-1 (l1)

3

2

Assured (af)

3

2

Low-2 (l2)

1

1

Best-Effort (be)

0

0
Parent topic: Access egress QoS policies on 7210 SAS-R6 and 7210 SAS-R12