Ufp Bandwidth Provisioning; Enhanced Transmission Selection Mode - Lenovo Flex System Fabric CN4093 Application Manual

UFP Bandwidth Provisioning

Enhanced Transmission Selection mode

1. Enable UFP ETS mode on a specific port:
2. Set the 802.1p priority value for the specific vPort:
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CN4093 Application Guide for N/OS 8.4
UFP provides two modes of bandwidth provisioning for vPort: Enhanced
Transmission Selection (ETS) mode and Strict Bandwidth Provisioning mode.
Enhanced Transmission Selection (ETS) mode of bandwidth provisioning is useful
when an end‐to‐end QoS framework for the entire data center, with bandwidth
provisioning for different applications, is desired. ETS mode color marks traffic
from point of origination to point of destination. It helps to couple QoS
provisioning in the access layer with data center fabric.
Note: ETS mode requires Converged Enhanced Ethernet (CEE) to be enabled
globally.
This mode functions with the ETS feature available on the CN4093. You must first
define the ETS characteristics of the CN4093. Assign each vPort to the desired
traffic class by assigning a system class priority. The Data Center Bridging
Capabilities Exchange (DCBX) and UFP protocols propagate the configured
parameters for the vPort to apply appropriate traffic coloring and shaping at the
source.
When operating in this mode, traffic scheduling and bandwidth allocation
behavior on switch egress is driven by the ETS class of traffic.
When two vPorts use the same traffic class configuration, the order in which
switch schedules traffic at egress depends on the order the traffic arrives at egress
buffer. Since bandwidth allocation is derived from traffic class rather than vNIC,
switch egress doesn't differentiate between different vPort traffics.
In a virtualized environment, the hypervisor or guest VM may define its own
traffic class priority. When configured this way, the priority defined by the OS or
Hypervisor takes precedence over vPort‐configured priority.
Use the following commands to configure ETS bandwidth provisioning:
CN 4093(config)# ufp port <port alias or number> qos-mode ets
CN 4093(config)# ufp port <port alias or number> vport <1‐8>
CN 4093(config_ufp_port)# qos ets priority <0‐7>
Note: In QoS ETS mode, only a priority of 3 is allowed for a vPort in FCoE mode.