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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.
Step Task Command Command Mode
1
Enter global configuration mode to create a
DCB map or edit PFC and ETS settings.
dcb-map name
CONFIGURATION
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-group
group_num {bandwidth
percentage | strict-
priority} pfc {on | off}
DCB MAP
FC Flex IO Modules
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