Users Guide

1 Apply the policy-map to the interface in INTERFACE mode or all interfaces in SYSTEM-QOS mode.
system qos
OR
interface ethernet node/slot/port[:subport]
2 Enter the output service-policy in SYSTEM-QOS mode or INTERFACE mode.
service-policy {output} type {queuing} policy-map-name
Enable strict priority on class-map and apply the policy-map globally
OS10(config)# class-map type queuing example-cmap-strictpriority
OS10(config-cmap-queuing)# match queue 7
OS10(config-cmap-queuing)# exit
OS10(config)# policy-map type queuing example-pmap-strictpriority
OS10(config-pmap-queuing)# class example-cmap-strictpriority
OS10(config-pmap-c-que)# priority
OS10(config-pmap-c-que)# exit
OS10(config-pmap-queuing)# exit
OS10(config)# system qos
OS10(config-sys-qos)# service-policy output type queuing example-pmap-strictpriority
Enable strict priority on interface
NOTE: You can apply a policy-map globally in SYSTEM-QOS mode or apply it on the interface. OS10 does not support applying
the same policy-map in SYSTEM-QOS mode as well as at the interface level.
However, you can apply a dierent queuing policy-map in SYSTEM-QOS mode or at the interface level. In this case, the policy-map
applied at the interface takes precedence over the policy-map applied globally.
OS10(config)# interface ethernet 1/1/5
OS10(conf-if-eth1/1/5)# service-policy output type queuing example-pmap-strictpriority
View policy-map
OS10(conf-if-eth1/1/5)# do show policy-map
Service-policy(queuing) output: example-pmap-strictpriority
Class-map (queuing): example-cmap-strictpriority
priority
Rate adjustment
QoS features such as policing and shaping do not include overhead elds such as Preamble, smart frame delimiter (SFD), inter-frame gap
(IFG), and so on. For rate calculations, these feature only include the frame length between the destination MAC address (DMAC) and the
CRC eld.
You can optionally include the following overhead elds in rate calculations by enabling rate adjustment:
• Preamble—7 bytes
• Start frame delimiter—1 byte
• Destination MAC address—6 bytes
• Source MAC address—6 bytes
• Ethernet type/length—2 bytes
• Payload—variable
• Cyclic redundancy check—4 bytes
• Inter-frame gap—variable
The rate adjustment feature is disabled by default. To enable rate adjustment, use the qos-rate-adjust value_of_rate_adjust
command. For example:
qos-rate-adjust 8
Quality of service
1131