Vnic Bandwidth Metering - Lenovo Flex System Fabric CN4093 Application Manual

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vNIC Bandwidth Metering

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CN4093 Application Guide for N/OS 8.2
Lenovo N/OS 8.2 supports bandwidth metering for vNIC traffic. By default, each 
of the four vNICs on any given port is allowed an equal share (25%) of NIC 
capacity when enabled. However, you may configure the percentage of available 
switch port bandwidth permitted to each vNIC.
vNIC bandwidth can be configured as a value from 1 to 100, with each unit 
representing 1% (or 100Mbps) of the 10Gbps link. By default, each vNICs enabled 
on a port is assigned 25 units (equal to 25% of the link, or 2.5Gbps). When traffic 
from the switch to the vNIC reaches its assigned bandwidth limit, the switch will 
drop packets egressing to the affected vNIC. 
Note: Bandwidth metering drops excess packets when configured limits are
reached. Consider using the ETS feature in applications where packet loss is not
desirable (see
"Enhanced Transmission Selection" on page
To change the bandwidth allocation, use the following commands:
CN4093(config)# vnic port <port alias or number> index <vNIC number (1‐4)>
CN4093(vnic­config)# bandwidth <allocated percentage>
Note: vNICs that are disabled are automatically allocated a bandwidth value of 0.
A combined maximum of 100 units can be allocated among vNIC pipes enabled for 
any specific port (bandwidth values for disabled pipes are not counted). If more 
than 100 units are assigned to enabled pipes, an error will be reported when 
attempting to apply the configuration.
The bandwidth metering configuration is automatically synchronized between the 
switch and vNICs for regular Ethernet and iSCSI traffic. Once configured on the 
switch, there is no need to manually configure vNIC bandwidth metering limits on 
the NIC.
Note: FCoE vNIC does not use egress metering. ETS and PFC must be enabled to
ensure lossless transmission for FCoE traffic. ETS does traffic shaping. You can
configure a minimum bandwidth for each traffic class. For example, 40% for FCoE
priority 3, 60% for the Ethernet traffic. FCoE traffic gets 40% minimum guaranteed
bandwidth. If the Ethernet traffic only consumes 30% bandwidth, then FCoE traffic
can use 70%. If there is no other Ethernet traffic, then FCoE traffic can use 100%.
The FCoE vNIC can use up to 100% of the bandwidth, with a minimum guaranteed
bandwidth of 40%.
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