Administrator Guide

Traffic Groupings Description
traffic in a group must have the same traffic handling
requirements for latency and frame loss.
Group ID A 4-bit identifier assigned to each priority group. The
range is from 0 to 7.
Group bandwidth Percentage of available bandwidth allocated to a
priority group.
Group transmission selection algorithm (TSA) Type of queue scheduling a priority group uses.
In the Dell Networking OS, ETS is implemented as follows:
• ETS supports groups of 802.1p priorities that have:
• PFC enabled or disabled
• No bandwidth limit or no ETS processing
• Bandwidth allocated by the ETS algorithm is made available after strict-priority groups are serviced. If a
priority group does not use its allocated bandwidth, the unused bandwidth is made available to other
priority groups.
• For ETS traffic selection, an algorithm is applied to priority groups using:
• Strict priority shaping
• ETS shaping
• ETS uses the DCB MIB IEEE 802.1azd2.5.
Configuring DCB Maps and its Attributes
This topic contains the following sections that describe how to configure a DCB map, apply the configured
DCB map to a port, configure PFC without a DCB map, and configure lossless queues.
DCB Map: Configuration Procedure
A DCB map consists of PFC and ETS parameters. By default, PFC is not enabled on any 802.1p priority and
ETS allocates equal bandwidth to each priority. To configure user-defined PFC and ETS settings, you must
create a DCB map.
1 Enter global configuration mode to create a DCB map or edit PFC and ETS settings.
CONFIGURATION mode
dcb-map name
2 Configure the PFC setting (on or off) and the ETS bandwidth percentage allocated to traffic in each
priority group, or whether the priority group traffic should be handled with strict priority scheduling. You
can enable PFC on a maximum of two priority queues on an interface. Enabling PFC for dot1p priorities
makes the corresponding port queue lossless. The sum of all allocated bandwidth percentages in all
groups in the DCB map must be 100%. Strict-priority traffic is serviced first. Afterwards, bandwidth
allocated to other priority groups is made available and allocated according to the specified percentages.
If a priority group does not use its allocated bandwidth, the unused bandwidth is made available to other
priority groups.
DCB MAP mode
priority-group group_num {bandwidth percentage | strict-priority} pfc {on | off}
FC Flex IO Modules 1058