Cisco 10000 Series Configuration Manual page 365
Quality of service configuration guide
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Also See for 10000 Series:
- Configuration manual (370 pages) ,
- Troubleshooting manual (70 pages) ,
- Installation manual (14 pages)
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Chapter 11
Managing Packet Queue Congestion
Router(config)# policy-map qos_pq_cbwfq_0
Router(config-pmap)# class dscp_10
Router(config-pmap-c)# queue-limit 32
Queue limit failed on ATM2/0/0.2484 VC 2484 (out of resources)
Queue limit failed on ATM2/0/0.2485 VC 2485 (out of resources)
Queue limit failed on ATM2/0/0.2486 VC 2486 (out of resources)
Queue limit failed on ATM2/0/0.2487 VC 2487 (out of resources)
Queue limit failed on ATM2/0/0.2488 VC 2488 (out of resources)
Queue limit failed on ATM2/0/0.2489 VC 2489 (out of resources)
!
!
Queue limit failed on ATM3/0/0.1547 VC 1547 (out of resources)
Queue limit failed on ATM3/0/0.1548 VC 1548 (out of resources)
!
!
-Traceback= 604D58EC 604C00C0 604C0288 604C43C4 604C43E4 604C254C 604C260C
604C478C 60D4B868 603AC304 6013B410 603C6270 604569C0 604569A4
-Traceback= 6049CA48 6049CCA4 60489224 60493688 604BFA4C 604C3EEC 604C3EE4
604C2554 604C260C 604C478C 60D4B868 603AC304 6013B410 603C6270 604569C0 604569A4
Random Early Detection and Weighted Random Early Detection
For classes other than class-default, you must use random early detection (RED) with the
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bandwidth, bandwidth remaining, or shape command.
You cannot use DSCP-based WRED with Multiprotocol Label Switching (MPLS) encapsulated
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packets. The router supports this feature for use with IP packets only.
You must configure the bandwidth command before you configure the random-detect dscp-based,
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random-detect prec-based, or random-detect discard-class-based command to enable WRED.
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For DSCP-based WRED, you can configure:
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–
–
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On the PRE3, when you configure multiple WRED profiles for a specific traffic class in a policy
map, each WRED profile within the same class must be based on the same drop type: DSCP-based,
precedence-based, or discard-class-based. You cannot mix drop types within a class in a policy map.
For example, the following example configuration shows how to configure WRED for the Bronze
class. Notice that each of the WRED profiles is based on a DSCP.
class-map Bronze
policy-map Business
On the PRE2, DSCP-based WRED enables you to configure eight unique drop precedence levels for
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one queue. Each of the 64 (0 to 63) DSCP values correspond to one of the eight drop levels. The
default setting applies to any DSCP-based WRED without a specified minimum and maximum
threshold value.
On the PRE1, DSCP-based WRED enables you to configure four unique drop precedence levels for
•
one queue. Each of the 64 DSCP values correspond to one of the four drop levels. When you
configure the four unique drop precedence levels, all of the queues configured on an interface share
the different levels.
OL-7433-09
One default drop profile for each class
Three assured forwarding (AF) drop profiles for each class
Four non-AF drop profiles for each policy map (PRE1) or four non-AF drop profiles for each
class (PRE2)
match ip dscp 1 2 3
class Bronze
random-detect dscp 1 100 200 1
random-detect dscp default 200 400 1
Restrictions and Limitations for Controlling Layer 3 Congestion
Cisco 10000 Series Router Quality of Service Configuration Guide
11-23
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