Users Guide

Generation of PFC for a Priority for Untagged Packets
In order to generate PFC for a particular priority for untagged packets, and configuring PFC for that priority, you should find the
queue number associated with priority from TABLE 1 and Associate a DCB map to forward the matched DSCP packet to that
queue. PFC frames gets generated with PFC priority associated with the queue when the queue gets congested.
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.
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. Before configuring ETS, use the cam-acl l2acl 2 ipv4acl 0 ipv6acl 0 ipv4qos 2 l2qos 0
l2pt 0 ipmacacl 0 vman-qos 0 fcoeacl 2 etsacl 1 iscsi 2 command to allocate the appropriate CAM region
for ETS.
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%.
Committed and peak bandwidth is in megabits per second. The range is from 0 to 100000.
Committed and peak burst size is in kilobytes. Default is 50. The range is from 0 to 100000.
3. Configure the 802.1p priorities for the traffic on which you want to apply an ETS output policy.
PRIORITY-GROUP mode
priority-list value
The range is from 0 to 7.
The default is none.
Separate priority values with a comma. Specify a priority range with a dash. For example, priority-list 3,5-7.
4. Exit priority-group configuration mode.
PRIORITY-GROUP mode
exit
5. Repeat Steps 1 to 4 to configure all remaining dot1p priorities in an ETS priority group.
6. Specify the dot1p priority-to-priority group mapping for each priority.
priority-pgid dot1p0_group_num dot1p1_group_num ...dot1p7_group_num
Priority group range is from 0 to 7. All priorities that map to the same queue must be in the same priority group.
Leave a space between each priority group number. For example: priority-pgid 0 0 0 1 2 4 4 4 in which priority group 0 maps
to dot1p priorities 0, 1, and 2; priority group 1 maps to dot1p priority 3; priority group 2 maps to dot1p priority 4; priority group
4 maps to dot1p priorities 5, 6, and 7.
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Data Center Bridging (DCB)