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Cisco 10000 Series Router Quality of Service Configuration Guide
OL-7433-09
Chapter 1 Quality of Service Overview
QoS Features, Commands, and Changes
random-detect Command
Cisco IOS Release: Release 12.0(17)SL
Description: The random-detect command was introduced on the PRE1 to configure a random early
detection drop policy for a traffic class that includes a bandwidth guarantee. The command allows you
to configure a drop policy based on IP precedence. An exponential-weight-constant option allows you
to change the default method random-detect uses to calculate the average queue size.
Cisco IOS Release: Release 12.0(21)ST
Description: This command was enhanced to support the MPLS experimental (EXP) field.
Cisco IOS Release: Release 12.0(22)S
Description: This command was enhanced to allow you to configure a drop policy based on a
differentiated services code point (DSCP).
Cisco IOS Release: Release 12.0(25)SX
Description: This command was enhanced to allow you to simultaneously configure the random-detect
command and the queue-limit command for the same class queue.
Cisco IOS Release: Release 12.2(16)BX
Description: This command was introduced on the PRE2.
Cisco IOS Release: Release 12.3(7)XI
Description: This command was enhanced on the PRE2 to:
• Enable the configuration of eight unique drop precedence levels for one queue instead of four levels
• Allow the simultaneous configuration of both the random-detect and queue-limit commands for a
class queue
• Support discard-class-based WRED
• Maintain separate WRED drop statistics for each IP precedence, discard-class, and DSCP value
Cisco IOS Release: Release 12.2(28)SB
Description: This command was integrated in Cisco IOS Release 12.2(28)SB.
Cisco IOS Release: Release 12.2(31)SB2
Description: This command was introduced on the PRE3.
Cisco IOS Release: Release 12.2(33)SB
Description: This command was enhanced to support the atm-clp clp-value option and implemented on
the PRE2, PRE3, and PRE4. This option allows you to specify a number that indicates the drop eligibility
of a packet based on the ATM CLP bit. Valid values are 0 or 1.
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