Administrator Guide

Data Center Bridging Features 1071
ETS Configuration Example
This example configures four classes of traffic:
1. Enable Trust Mode on an Interface
The following command enables the use of the 802.1p priority of the
incoming packet. It may be configured on a single interface, a range of
interfaces or all interfaces. By default, ports are configured to trust the
incoming user priority.
console(config-if-Te1/0/1)#classofservice trust dot1p
To show the configured trust mode on an interface, use the following
command:
console#show classofservice trust tengigabitethernet 1/0/1
Class of Service Trust Mode: Dot1P
2. Map 802.1p Priority to CoS Queues
This step maps 802.1p user priorities to the CoS queues. This mapping places
the incoming packet in the selected CoS queue based on the 802.1p user
priority. It may be configured on a single interface, a range of interfaces, or all
interfaces.
To ensure lossless behavior, the 802.1p user priority must be mapped one to
one to a CoS queue for the lossless priorities. Up to two lossless priorities may
be configured on Dell Networking N4000 Series switches. CoS queue 7 is
reserved by the system and is not assignable. It is generally recommended that
the administrator utilize CoS queues 0-3 as CoS queues 4-6 may be utilized
by the system for other types of system traffic, e.g. routing protocol PDU
handling. Frames with different user priorities assigned to a single CoS queue
receive equal treatment.
Best effort traffic CoS Queue 0 for untagged and VLAN-tagged
frames with VPTs 0, 1, and 2
Lossless iSCSI traffic CoS Queues 1 & 2 for VLAN tagged frames with
VPTs 3 & 4 respectively
Expedited traffic CoS Queue 3 on VLAN tagged frames with VPTs
5, 6, and 7