Configuring A Class Map To Classify Mpls Packets - Cisco 7604 Configuration Manual
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Configuring PFC3BXL or PFC3B Mode MPLS QoS
Restrictions and Usage Guidelines
If QoS is disabled (no mls qos) for the PFC3BXL or PFC3B, the EXP value is determined as follows:
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•
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Configuring a Class Map to Classify MPLS Packets
You can use the match mpls experimental topmost command to define traffic classes inside the MPLS
domain by packet EXP values. This allows you to define service policies to police the EXP traffic on a
per-interface basis by using the police command.
To configure a class map, perform this task beginning in global configuration mode:
Command
Step 1
Router(config)# class-map class_name
Step 2
Router(config-cmap)# match mpls experimental topmost
value
Step 3
Router(config-cmap)# exit
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
42-20
For IP-to-MPLS or EoMPLS imposition when the received packet is an IP packet:
When QoS is disabled (no mls qos), the EXP value is based on the received IP ToS.
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When QoS is queuing only (mls qos queueing-only), the EXP value is based on the received
IP ToS.
For EoMPLS imposition when the received packet is a non-IP packet:
When QoS is disabled, the EXP value is based on the ingress CoS.
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–
When QoS is queuing only, the EXP value is based on the received IP ToS.
For MPLS-to-MPLS operations:
–
Swapping when QoS is disabled, the EXP value is based on the original EXP value (in the
absence of EXP mutation).
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Swapping when QoS is queuing only, the EXP value is based on the original EXP value (in the
absence of EXP mutation).
Imposing an additional label when QoS is disabled, the EXP value is based on the original EXP
–
value (in the absence of EXP mutation).
Imposing additional label when QoS is queuing only, the EXP value is based on the original
–
EXP value (in the absence of EXP mutation).
Popping one label when QoS is disabled, the EXP value is based on the underlying EXP value.
–
Popping one label when QoS is queuing only, the EXP value is based on the underlying EXP
–
value.
EXP value is irrelevant to MPLS-to-IP disposition.
Chapter 42
Configuring PFC3BXL or PFC3B Mode MPLS QoS
Purpose
Specifies the class map to which packets will be
matched.
Specifies the packet characteristics that will be
matched to the class.
Exits class-map configuration mode.
OL-4266-08
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