12-7
Cisco 10000 Series Router Quality of Service Configuration Guide
OL-7433-09
Chapter 12 Sharing Bandwidth Fairly During Congestion
Interfaces Supporting Class-Based Weighted Fair Queuing
Interfaces Supporting Class-Based Weighted Fair Queuing
The following describes interface support for class-based weighted fair queuing (CBWFQ):
Interfaces Supporting CBWFQ (Outbound Only)
• Physical
• Multilink PPP and Multilink Frame Relay
• ATM shaped (peak cell rate is specified) unspecified bit rate (UBR) PVCs and point-to-point
subinterfaces
• ATM constant bit rate (CBR) PVCs and point-to-point subinterfaces
• ATM variable bit rate (VBR) PVCs and point-to-point subinterfaces
• Label-controlled ATM (LC-ATM) subinterfaces *
• Frame Relay PVCs, point-to-point subinterfaces, and map classes *
• Ethernet VLANs *
* Requires a specific type of hierarchical policy. For more information, see Chapter 13, “Defining QoS
for Multiple Policy Levels.”
Note The router only supports CBWFQ on outbound interfaces.
Interfaces Not Supporting CBWFQ
• ATM unshaped (no peak cell rate specified) UBR PVCs and point-to-point subinterfaces
• IP tunnel
• Virtual-access (See the “VAI QoS Inheritance” section on page 4-24.)
Note The router does not support the CBWFQ on inbound interfaces.
Configuring Fair Bandwidth Sharing During Congestion
To configure fair bandwidth sharing using QoS service policies, perform the following required
configured tasks:
• Defining Traffic Classes Using Class Maps, page 12-8
• Configuring Policy Actions for Traffic Classes Using Policy Maps, page 12-9
• Attaching Service Policies, page 12-15
The following are optional configuration tasks:
• Modifying the Bandwidth for an Existing Policy Map Class, page 12-16
• Modifying the Queue Limit for an Existing Policy Map Class, page 12-17
• Deleting Classes, page 12-17
• Deleting Policy Maps, page 12-18
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