Reference Guide

• An ETS-enabled interface operates with dynamic weighted round robin (DWRR) or strict priority scheduling.
• OS10 control trac is sent to control queues, which have a strict priority that is higher than data trac queues. ETS-allocated
bandwidth is not supported on a strict priority queue. A strict priority queue receives bandwidth only from DCBX TLVs.
• The CEE/IEEE2.5 versions of ETS TLVs are supported. ETS congurations are received in a TLV from a peer.
Congure ETS
ETS provides trac prioritization for lossless storage, latency-sensitive, and best-eort data trac on the same link.
• Congure classes of dot1p and DSCP trac and assign them to lossless queues. Use the class-trust class map to honor ingress dot1p
and DSCP trac.
• Allocate guaranteed bandwidth to each lossless queue. An ETS queue can exceed the amount of allocated bandwidth if another queue
does not use its share.
ETS is disabled by default on all interfaces.
1 Congure trust maps of dot1p and DSCP values in CONFIGURATION mode. A trust map does not modify ingress values in output
ows. Assign a qos-group (trac class 0-7) to trusted dot1p/DSCP values in TRUST mode. A qos-group number is used only
internally to schedule classes of ingress trac. Enter multiple dot1p and dscp values in a hyphenated range or separated by
commas.
trust dot1p-map dot1p-map-name
qos-group {0-7} dot1p {0-7}
exit
trust dscp-map
dscp-map-name
qos-group {0-7} dscp {0-63}
exit
2 Congure a QoS map with trusted trac-class (qos-group) to lossless-queue mapping in CONFIGURATION mode. Assign one or
more qos-groups (0-7) to a specied queue in QOS-MAP mode. Enter multiple qos-group values in a hyphenated range or
separated by commas. Enter multiple queue qos-group entries, if necessary.
qos-map traffic-class queue-map-name
queue {0-7} qos-group {0-7}
exit
3 Create a service policy for the class-trust class in CONFIGURATION mode. Enter POLICY-CLASS-MAP mode and specify that
dot1p or DSCP values are trusted.
policy—map trust-policy—map-name
class class-trust
trust {dot1p | dscp}
exit
4 Create a queuing class map for each ETS queue in CONFIGURATION mode. Enter match queue criteria in CLASS-MAP mode.
class—map type queuing class—map-name
match queue {0-7}
exit
5 Create a queuing policy map in CONFIGURATION mode. Enter POLICY-CLASS-MAP mode and congure the percentage of
bandwidth allocated to each trac class-queue mapping. The sum of all DWRR-allocated bandwidth across ETS queues must be
100% (not including the strict priority queue). Otherwise, QoS automatically adjusts bandwidth percentages so that ETS queues
always receive 100% bandwidth. The remaining non-ETS queues receive 1% bandwidth each.
policy—map type queuing policy—map-name
class class—map-name
bandwidth percent {1-100}
(Optional) To congure a queue as strict priority, use the priority command. Packets scheduled to a strict priority queue are
transmitted before packets in non-priority queues.
policy—map type queuing policy—map-name
class class—map-name
priority
6 Apply the trust maps for dot1p and DSCP values, and the trac class-queue mapping globally on the switch in SYSTEM-QOS mode
or on an interface or interface range in INTERFACE mode.
system qos
trust-map dot1p dot1p-map-name
638
Converged data center services