Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 247)

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Dell Networking OS Behavior: Create a DCB output policy to associate a priority group with an ETS

output policy with scheduling and bandwidth configuration. You can apply a DCB output policy on

multiple egress ports.

The ETS configuration associated with 802.1p priority traffic in a DCB output policy is used in DCBx

negotiation with ETS peers.

When you apply an ETS output policy to an interface, ETS-configured scheduling and bandwidth

allocation take precedence over any configured settings in the QoS output policies.

To remove an ETS output policy from an interface, use the no dcb-policy output policy-name

command. DCB and ETS are both disabled by default. When DCB is enabled, ETS is enabled on all

interfaces that have the default ETS configuration applied.

If you disable ETS in an output policy applied to an interface (the no ets mode on command), any

previously configured QoS settings at the interface or global level take effect. If QoS settings are

configured at the interface or global level and in an output policy map (the service-policy output

command), the QoS configuration in the output policy take precedence.

ETS Operation with DCBx

The following section describes DCBx negotiation with peer ETS devices.

In DCBx negotiation with peer ETS devices, ETS configuration is handled as follows:

• ETS TLVs are supported in DCBx versions CIN, CEE, and IEEE2.5.

• The DCBx port-role configurations determine the ETS operational parameters (refer to Configure a

DCBx Operation).

• ETS configurations received from TLVs from a peer are validated.

• If there is a hardware limitation or TLV error:

– DCBx operation on an ETS port goes down.

– New ETS configurations are ignored and existing ETS configurations are reset to the previously

configured ETS output policy on the port or to the default ETS settings if no ETS output policy was

previously applied.

• ETS operates with legacy DCBx versions as follows:

– In the CEE version, the priority group/traffic class group (TCG) ID 15 represents a non-ETS priority

group. Any priority group configured with a scheduler type is treated as a strict-priority group and

is given the priority-group (TCG) ID 15.

– The CIN version supports two types of strict-priority scheduling:

* Group strict priority: Use this to increase its bandwidth usage to the bandwidth total of the

priority group and allow a single priority flow in a priority group. A single flow in a group can

use all the bandwidth allocated to the group.

* Link strict priority: Use this to increase to the maximum link bandwidth and allow a flow in any

priority group.

CIN supports only the dot1p priority-queue assignment in a priority group. To configure a dot1p

priority flow in a priority group to operate with link strict priority, you configure: The dot1p priority for

strict-priority scheduling (strict-priority command). The priority group for strict-priority

scheduling (scheduler strict command; Creating a QoS ETS Output Policy).

If you configure only the priority group in an ETS output policy or only the dot1p priority for strict-

priority scheduling, the flow is handled with group strict priority.

Data Center Bridging (DCB)

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