Lenovo Flex System Fabric CN4093, Application Manual

Page: 367 / 634

© Copyright Lenovo 2017 Chapter 21: Unified Fabric Port
367
UFP Strict Bandwidth Provisioning mode
Strict bandwidth provisioning mode configures the switch and NIC apply
bidirectional bandwidth control on the vPort as per the defined configuration. By
default, a bandwidth of 2.5 Gbps per vPort is guaranteed. If other vPorts are idle,
the bandwidth of a vPort can be up to 10 Gbps. A minimum bandwidth of 1 Gbps
is provisioned, which can be raised by 100 Mbps increments. The sum of the
minimum bandwidth guaranteed for all vPorts together cannot exceed the
capacity of the physical link. A vPort can also be configured with a maximum
bandwidth.
This mode works with the port scheduler to avoid unintended packet drops due to
policing through EFP metering block. If flow control is enabled, the switch
provides a no ‐ drop packet forwarding behavior, which improves end ‐ to ‐ end
TCP ‐ throughput performance.
Note:
If a vPort is configured with low upper limit, it might lead to head ‐ of ‐ line
congestion on the egress port.
ETS mode is disabled when strict bandwidth provisioning mode is enabled. By
default, uplink ports have a separate traffic class for storage traffic with guaranteed
bandwidth. The rest of the bandwidth is shared equally among other traffic.
Use the following commands to configure strict bandwidth provisioning:
1.
Enable UFP Strict Bandwidth Provisioning mode on a specific port:
2.
Configure the bandwidth settings for a specific vPort:
Note:
Total minimum guaranteed bandwidth of enabled vPorts on a physical
switch port needs to be 100%.
CN 4093(config)# ufp port
<port alias or number>
qos-mode bw
CN 4093(config)# ufp port
<port alias or number>
vport
<1 ‐ 8>
CN 4093(config_ufp_vport)# qos bandwidth {max|min}
<10 ‐ 100>
min - Sets minimum guaranteed bandwidth
max - Sets maximum allowed bandwidth