- Index
- Preface
- Product Overview
- Virtual Switching Systems (VSS)
- Layer 2 LAN Port Configuration
- Flex Links
- EtherChannels
- IEEE 802.1ak MVRP and MRP
- VLAN Trunking Protocol (VTP)
- VLANs
- Private VLANs (PVLANs)
- Private Hosts
- IEEE 802.1Q Tunneling
- Layer 2 Protocol Tunneling
- Spanning Tree Protocols (STP, MST)
- Optional STP Features
- IP Unicast Layer 3 Switching
- Multiprotocol Label Switching (MPLS)
- MPLS VPN Support
- Ethernet over MPLS (EoMPLS)
- Virtual Private LAN Services (VPLS)
- Ethernet Virtual Connections (EVC)
- Layer 2 over Multipoint GRE (L2omGRE)
- IPv4 Multicast Layer 3 Features
- IPv4 Multicast IGMP Snooping
- IPv4 PIM Snooping
- IPv4 Multicast VLAN Registration (MVR)
- IPv4 IGMP Filtering
- IPv4 Router Guard
- IPv4 Multicast VPN Support
- IPv6 Multicast Layer 3 Features
- IPv6 MLD Snooping
- NetFlow Hardware Support
- Call Home
- System Event Archive (SEA)
- Backplane Platform Monitoring
- Local SPAN, RSPAN, and ERSPAN
- SNMP IfIndex Persistence
- Top-N Reports
- Layer 2 Traceroute Utility
- Mini Protocol Analyzer
- PFC QoS Overview
- PFC QoS Guidelines and Restrictions
- PFC QoS Classification, Marking, and Policing
- PFC QoS Policy Based Queueing
- PFC QoS Global and Interface Options
- AutoQoS
- MPLS QoS
- PFC QoS Statistics Data Export
- Cisco IOS ACL Support
- Cisco TrustSec (CTS)
- AutoSecure
- MAC Address-Based Traffic Blocking
- Port ACLs (PACLs)
- VLAN ACLs (VACLs)
- Policy-Based Forwarding (PBF)
- Denial of Service (DoS) Protection
- Control Plane Policing (CoPP)
- Dynamic Host Configuration Protocol (DHCP) Snooping
- IP Source Guard
- Dynamic ARP Inspection (DAI)
- Traffic Storm Control
- Unknown Unicast and Multicast Flood Control
- IEEE 802.1X Port-Based Authentication
- Configuring Web-Based Authentication
- Port Security
- Lawful Intercept
- Online Diagnostic Tests
- Migrating From a 12.2SX QoS Configuration
PFC QoS Overview
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 15.0SY. 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/ps11845/prod_command_reference_list.html
- Cisco IOS Release 15.0SY supports only Ethernet interfaces. Cisco IOS Release 15.0SY does not support any WAN features or commands.
- For information about AutoQoS, see Chapter1, “AutoQoS”
- For information about QoS and MPLS, see Chapter1, “MPLS QoS”
- QoS in Cisco IOS Release 15.0SY (PFC QoS) uses some Cisco IOS modular QoS CLI (MQC). Because PFC QoS is implemented in hardware, it supports only a subset of the MQC syntax.
http://www.cisco.com/en/US/products/hw/switches/ps708/tsd_products_support_series_home.html
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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:
- Policies that define any combination of egress DSCP mutation, egress EXP mutation, classification, marking, and policing.
- Policies that define queueing.
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-map —Defines a traffic class based on packet-matching criteria. Class maps are referenced in policy maps.
- table-map —Defines mapping from one set of traffic field values to another set of traffic fields values. Table maps are referenced in policy maps. Not used in queueing policies.
- policy-map —Defines or uses any combination of the following:
– Class maps for classification
– Table maps for marking and mutation
– Queueing (cannot be combined with classification,marking, trust mode, or policing)
- Restrictions for PFC QoS
- Classification, Marking, and Policing
- Policy-Based Queueing
- QoS Global and Interface Options
http://www.cisco.com/en/US/products/hw/switches/ps708/tsd_products_support_series_home.html
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