Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 243)

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• When allocating bandwidth or configuring a queue scheduler for dot1p priorities in a priority group on

a DCBx CIN interface, take into account the CIN bandwidth allocation (refer to Configuring

Bandwidth Allocation for DCBx CIN) and dot1p-queue mapping.

• Although an DCB Output policy does not support WRED, ECN, rate shaping, and rate limiting because

DCBx does not negotiate these parameters with peer devices, you can apply a QoS output policy with

WRED and/or rate shaping on a DCBx CIN-enabled interface (refer to Configuring Port-Based Rate

Shaping and Weighted Random Early Detection). In this case, the WRED or rate shaping configuration

in the QoS output policy takes into account the bandwidth allocation or queue scheduler configured

in the DCB Output policy.

• You can only use a QoS DCB output policy in association with a priority group in a DCB output policy

and cannot be applied to an interface as a normal QoS output policy (refer to Applying an ETS Output

Policy for a Priority Group to an Interface and Creating an Output QoS Policy in the Quality of Service

(QoS) chapter.).

NOTE: The IEEE 802.1Qaz, CEE, and CIN versions of ETS are supported.

Creating a QoS DCB Output Policy

A QoS output policy that you create to optimize bandwidth on an output interface for specified priority

traffic consists of the ETS settings (the bandwidth percentage and queue schedule) used in DCBx

negotiations with peer devices.

1. Create a QoS output policy to configure the ETS bandwidth allocation and scheduling for priority

traffic.

CONFIGURATION mode

qos-policy-output policy-name ets

The maximum is 32 characters.

2. (Optional) Configure the method used to schedule priority traffic in port queues.

POLICY-MAP-OUT-ETS mode

scheduler value

strict — Strict priority traffic is serviced before any other queued traffic (refer to Enabling Strict-

Priority Queueing in the Quality of Service (QoS) chapter).

NOTE: If you configure a scheduling method, you cannot configure bandwidth allocation in

Step 3.

werr —Weighted elastic round robin provides low-latency scheduling for priority traffic on port

queues. WERR scheduling is used to queue priority traffic by default.

3. (Optional) Configure the bandwidth percentage allocated to priority traffic in port queues.

POLICY-MAP-OUT-ETS mode

bandwidth-percentage percentage

The percentage range is from 1 to 100% in units of 1%. The sum of bandwidth percentage assigned to

dot1p priorities/queues in a priority group should be 100%.

The default is none.

NOTE: If you configure bandwidth allocation, you cannot configure a scheduling method in

Step 2.

Data Center Bridging (DCB)

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