• 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 default ETSsettings.• 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 prioritygroup. Any priority group configured with a scheduler type is treated as a strict-priority group andis 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 thepriority group and allow a single priority flow in a priority group. A single flow in a group canuse all the bandwidth allocated to the group.* Link strict priority: Use this to increase to the maximum link bandwidth and allow a flow in anypriority group.CIN supports only the dot1p priority-queue assignment in a priority group. To configure a dot1ppriority flow in a priority group to operate with link strict priority, you configure: The dot1p priority forstrict-priority scheduling (strict-priority command). The priority group for strict-priorityscheduling (scheduler strict command.Configuring Bandwidth Allocation for DCBx CINAfter you apply an ETS output policy to an interface, if the DCBx version used in your data center networkis CIN, you may need to configure a QoS output policy to overwrite the default CIN bandwidth allocation.This default setting divides the bandwidth allocated to each port queue equally between the dot1ppriority traffic assigned to the queue.To create a QoS output policy that allocates different amounts of bandwidth to the different traffic types/dot1p priorities assigned to a queue and apply the output policy to the interface, follow these steps.1. Create a QoS output policy.CONFIGURATION modeDell(conf)#qos-policy-output test12The maximum 32 alphanumeric characters.2. Configure the percentage of bandwidth to allocate to the dot1p priority/queue traffic in theassociated L2 class map.QoS OUTPUT POLICY modeDell(conf-qos-policy-out)#bandwidth-percentage 100The default is none.3. Repeat Step 2 to configure bandwidth percentages for other priority queues on the port.QoS OUTPUT POLICY modeDell(conf-qos-policy-out)#bandwidth-percentage 1004. Exit QoS Output Policy Configuration mode.QoS OUTPUT POLICY modeDell(conf-if-te-0/1)#exit258 Data Center Bridging (DCB)
