Cisco 10000 Series Configuration Manual page 18

Contents
Managing Packet Queue Congestion
11
C H A P T E R
Cisco 10000 Series Router Quality of Service Configuration Guide
xviii
Queue Scaling Limits
11-1
Queue Limit
11-2
Queue Limit Packet Buffers
Default Queue Limit and Packet Buffers
queue-limit Command
Syntax Description
queue-limit Command History
Default Behavior for the queue-limit Command
Usage Guidelines for the queue-limit Command
Queue IDs and Interface Queues
Reserved QIDs
11-6
Queuing Outbound Traffic
Queuing Outbound Traffic on ATM Interfaces
Queuing Outbound Traffic on Frame Relay Interfaces
Queuing Outbound Traffic on Virtual LAN Interfaces
Controlling Congestion Using Tail Drop
Feature History for Tail Drop
Tail Drop and Random Early Detection
Controlling Congestion Using Random Early Detection
Feature History for Random Early Detection
Random Early Detection and Queue Limit
Determining Packet Drop Probability
Recommended Settings for RED Drop Probability
Controlling Congestion Using Weighted Random Early Detection
Feature History for Weighted Random Early Detection
Benefits of Using Weighted Random Early Detection
How WRED Works
11-13
WRED Drop Mode
11-13
WRED Drop Profiles
WRED Aggregate Drop Profiles
Usage Guidelines for the random-detect Command
Minimum and Maximum Thresholds
WRED and Queue Limit
Average Queue Size and the Exponential Weight Constant
Interfaces Supporting Layer 3 Packet Drop Policies
Restrictions and Limitations for Controlling Layer 3 Congestion
Configuring Layer 3 Queue Limit and Drop Policies
11-1
11-4
11-4
11-4
11-5
11-5
11-6
11-7
11-7
11-8
11-8
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11-9
11-10
11-10
11-14
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11-5
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11-18
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11-22
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