Deployment Guide

Trac Groupings Description
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 trac selection, an algorithm is applied to priority groups using:
• Strict priority shaping
• ETS shaping
• ETS uses the DCB MIB IEEE 802.1azd2.5.
Conguring DCB Maps and its Attributes
This topic contains the following sections that describe how to congure a DCB map, apply the congured DCB map to a port, congure
PFC without a DCB map, and congure lossless queues.
DCB Map: Conguration 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 congure user-dened PFC and ETS settings, you must create a DCB map.
1 Enter global conguration mode to create a DCB map or edit PFC and ETS settings.
CONFIGURATION mode
dcb-map name
2 Congure the PFC setting (on or o) and the ETS bandwidth percentage allocated to trac in each priority group, or whether the
priority group trac 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 trac is serviced rst. Afterwards, bandwidth allocated to
other priority groups is made available and allocated according to the specied 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 | o}
Example:
priority-group 0 bandwidth 60 pfc off
priority-group 1 bandwidth 20 pfc on
priority-group 2 bandwidth 20 pfc on
priority-group 4 strict-priority pfc off
Repeat this step to congure PFC and ETS trac handling for each priority group.
3 Specify the dot1p priority-to-priority group mapping for each priority. Priority-group range: 0 to 7.
DCB MAP mode
priority-pgid dot1p0_group_num dot1p1_group_num dot1p2_group_num dot1p3_group_num
dot1p4_group_num dot1p5_group_num dot1p6_group_num dot1p7_group_num
FC Flex IO Modules
949