Reference Guide

ETS conguration notes
• ETS is supported on L2 802.1p priority (dot1p 0 to 7) and L3 DSCP (0 to 63) trac. FCoE trac uses dot1p priority 3 — iSCSI storage
trac uses dot1p priority 4.
• Apply these maps and policies on interfaces:
• Trust maps — OS10 interfaces do not honor the L2 and L3 priority elds in ingress trac by default. Create a trust map to honor
dot1p and DSCP classes of lossless trac. A trust map does not change ingress dot1p and DSCP values in egress ows. In a trust
map, assign a qos-group (trac class) to trusted dot1p/DSCP values. A qos-group number is used only internally to schedule
classes of ingress trac.
• QoS map — Create a QoS map to assign trusted dot1p and DSCP trac classes to lossless queues.
• Ingress trust policy — Congure a service policy to trust dot1p values in ingress trac.
• Egress queuing policy — Congure ETS for egress trac by assigning bandwidth to matching lossless queues in queuing class
and policy maps.
• Apply both PFC network-qos (input) and ETS queuing (output) policies on an interface to ensure lossless transmission.
• 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
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