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context. For example, one of the Te/Fo interfaces can have pfc-dot1p priorities as 2 and 3. Whereas, the
other Te/Fo interface(s) can have its pfc-dot1p priorities as 4 and 5.
It is the user responsibility to have symmetric PFC configurations on the interfaces involved in a particular
PFC-enabled traffic-flow to obtain lossless behavior.
Configure Enhanced Transmission Selection
ETS provides a way to optimize bandwidth allocation to outbound 802.1p classes of converged Ethernet
traffic.
Different traffic types have different service needs. Using ETS, you can create groups within an 802.1p
priority class to configure different treatment for traffic with different bandwidth, latency, and best-effort
needs.
For example, storage traffic is sensitive to frame loss; interprocess communication (IPC) traffic is latency-
sensitive. ETS allows different traffic types to coexist without interruption in the same converged link by:
• Allocating a guaranteed share of bandwidth to each priority group.
• Allowing each group to exceed its minimum guaranteed bandwidth if another group is not fully using
its allotted bandwidth.
ETS Prerequisites and Restrictions
The following prerequisites and restrictions apply when you configure ETS bandwidth allocation or queue
scheduling.
• Configuring ETS bandwidth allocation or a queue scheduler for dot1p priorities in a priority group is
applicable if the DCBx version used on a port is CIN (refer to Configuring DCBx).
• When allocating bandwidth or configuring a queue scheduler for dot1p priorities in a priority group on
a DCBx CIN interface, take into account the CIN bandwidth allocation (refer to Configuring
Bandwidth Allocation for DCBx CIN) and dot1p-queue mapping.
NOTE: The IEEE 802.1Qaz, CEE, and CIN versions of ETS are supported.
Creating an ETS Priority Group
An ETS priority group specifies the range of 802.1p priority traffic to which a QoS output policy with ETS
settings is applied on an egress interface.
1. Configure a DCB Map.
CONFIGURATION mode
dcb-map dcb-map-name
The dcb-map-name variable can have a maximum of 32 characters.
2. Create an ETS priority group.
CONFIGURATION mode
priority-group group-num {bandwidth bandwidth | strict-priority} pfc off
The range for priority group is from 0 to 7.
Set the bandwidth in percentage. The percentage range is from 1 to 100% in units of 1%.
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Data Center Bridging (DCB)