Cisco 7604 User Manual

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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 41 Configuring PFC QoS
Configuring PFC QoS
This example shows how to verify the configuration:
Router# show mls qos maps | begin IpPrecedence-dscp map
IpPrecedence-dscp map:
ipprec: 0 1 2 3 4 5 6 7
----------------------------------
dscp: 0 1 2 3 4 5 6 7
<...Output Truncated...>
Router#
Configuring DSCP Markdown Values
To configure the mapping of DSCP markdown values used by policers, perform this task:
When configuring a DSCP markdown map, note the following information:
• You can enter the normal-burst keyword to configure the markdown map used by the
exceed-action policed-dscp-transmit keywords.
• You can enter the max-burst keyword to configure the markdown map used by the violate-action
policed-dscp-transmit keywords.
Note When you create a policer that does not use the pir keyword, and the maximum_burst_bytes
parameter is equal to the normal_burst_bytes parameter (which occurs if you do not enter
the maximum_burst_bytes parameter), the exceed-action policed-dscp-transmit keywords
cause PFC QoS to mark traffic down as defined by the policed-dscp max-burst markdown
map.
• To avoid out-of-sequence packets, configure the markdown maps so that conforming and
nonconforming traffic uses the same queue.
• You can enter up to 8 DSCP values that map to a marked-down DSCP value.
• You can enter multiple commands to map additional DSCP values to a marked-down DSCP value.
• You can enter a separate command for each marked-down DSCP value.
Note Configure marked-down DSCP values that map to CoS values consistent with the markdown penalty.
Command Purpose
Step 1
Router(config)# mls qos map policed-dscp
{normal-burst | max-burst}
dscp1 [ dscp2 [ dscp3
[
dscp4 [ dscp5 [ dscp6 [ dscp7 [ dscp8 ]]]]]]] to
markdown_dscp
Configures a DSCP markdown map.
Router(config)# no mls qos map policed-dscp
{normal-burst | max-burst}
Reverts to the default map.
Step 2
Router(config)# end
Exits configuration mode.
Step 3
Router# show mls qos maps
Verifies the configuration.

Cisco 7604 Specifications

General

Brand	Cisco
Model	7604
Category	Network Router
Language	English