Reference Guide

ETS configuration notes
● ETS is supported on L2 802.1p priority (dot1p 0 to 7) and L3 DSCP (0 to 63) traffic. FCoE traffic uses dot1p priority 3 —
iSCSI storage traffic uses dot1p priority 4.
●
Apply these maps and policies on interfaces:
○ Trust maps — OS10 interfaces do not honor the L2 and L3 priority fields in ingress traffic by default. Create a trust
map to honor dot1p and DSCP classes of lossless traffic. A trust map does not change ingress dot1p and DSCP values in
egress flows. In a trust map, assign a qos-group (traffic class) to trusted dot1p/DSCP values. A qos-group number is
used only internally to schedule classes of ingress traffic.
○ QoS map — Create a QoS map to assign trusted dot1p and DSCP traffic classes to lossless queues.
○ Ingress trust policy — Configure a service policy to trust dot1p values in ingress traffic.
○ Egress queuing policy — Configure ETS for egress traffic 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 traffic is sent to control queues, which have a strict priority that is higher than data traffic 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 configurations are received in a TLV from a peer.
Configure ETS
ETS provides traffic prioritization for lossless storage, latency-sensitive, and best-effort data traffic on the same link.
● Configure classes of dot1p and DSCP traffic and assign them to lossless queues. Use the class-trust class map to honor
ingress dot1p and DSCP traffic.
● 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. Configure trust maps of dot1p and DSCP values in CONFIGURATION mode. A trust map does not modify ingress values in
output flows. Assign a qos-group (traffic class 0-7) to trusted dot1p/DSCP values in TRUST mode. A qos-group number
is used only internally to schedule classes of ingress traffic. 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
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