-
null
The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
This chapter provides an overview of quality of service (QoS) as implemented on the Policy Feature Card (PFC) and Distributed Forwarding Cards (DFCs) in Cisco IOS Release 15.4SY. The term “PFC QoS” refers to hardware accelerated QoS. PFC QoS is implemented on various switch components in addition to the PFC and any DFCs.
Note ● For complete syntax and usage information for the commands used in this chapter, see these publications:
http://www.cisco.com/en/US/products/ps11846/prod_command_reference_list.html
http://www.cisco.com/en/US/products/hw/switches/ps708/tsd_products_support_series_home.html
Participate in the Technical Documentation Ideas forum
QoS makes network performance more predictable and bandwidth utilization more effective. Without QoS, networks operate on a best-effort delivery basis, which means that all traffic has equal priority and an equal chance of being delivered in a timely manner. When congestion occurs, all traffic has an equal chance of being dropped. QoS minimizes the chance that priority traffic would be dropped.
PFC QoS has these capabilities:
You can configure two types of policies:
Queuing configuration and classification, marking, and policing configuration are all optional.
Queuing configuration and classification, marking, and policing configuration have no common parameters or commands.
You configure QoS policies with the following commands:
– Class maps for classification
– Table maps for marking and mutation
– Queueing (cannot be combined with classification,marking, trust mode, or policing)
http://www.cisco.com/en/US/products/hw/switches/ps708/tsd_products_support_series_home.html
Participate in the Technical Documentation Ideas forum