Mpls Qos Configuration Guidelines; Setting The Priority Of Packets With Experimental Bits - Cisco 3845 - Security Bundle Router Software Manual
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Configuring QoS
MPLS QoS Configuration Guidelines
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Setting the Priority of Packets with Experimental Bits
MPLS and EoMPLS provide QoS on the ingress router by using 3 experimental bits in a label to
determine the priority of packets. To support QoS between LERs, set the experimental bits in both the
virtual-connection and tunnel labels.
The process includes these steps on the ingress router:
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Beginning in privileged EXEC mode, follow these steps to set the experimental bits for EoMPLS or
MPLS QoS:
Command
Step 1
configure terminal
Step 2
class-map class-map-name
Step 3
match {ip dscp dscp-list | ip
precedence ip-precedence-list}
Step 4
exit
Step 5
policy-map policy-map-name
Step 6
class class-name
Cisco ME 3800X and 3600X Switch Software Configuration Guide
27-54
The switch supports these MPLS QoS features:
MPLS can tunnel the QoS values of a packet (that is, QoS is transparent from edge to edge).
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With QoS transparency, the IP marking in the IP packet is preserved across the MPLS network.
You can mark the MPLS EXP field differently and separately from the per-hop behavior (PHB)
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marked in the IP precedence, DSCP, or CoS field.
One label-switched path (LSP) can support up to eight classes of traffic (that is, eight PHBs) because
the MPLS EXP field is a 3-bit field.
MPLS DiffServ tunneling modes support E-LSPs. An E-LSP is an LSP on which nodes determine
the QoS treatment for MPLS packet exclusively from the EXP bits in the MPLS header.
The switch does not support egress QoS marking.
MPLS QoS classification does not work for bridged MPLS packets.
For port-based EoMPLS, you cannot match the payload VLAN.
Configure a class map to classify IP packets according to their DSCP or IP precedence classification.
Configure a policy map to mark MPLS packets (write their classification into the MPLS
experimental field).
Attach the service policy to the input interface or service instance.
Purpose
Enter global configuration mode.
Specify the name of the traffic class, and enter class-map configuration
mode.
Specify the matching criteria for IEEE 802.1Q packets.
Return to global configuration mode.
Specify the name of the traffic policy to configure, and enter policy-map
configuration mode.
Specify the name of the predefined traffic class configured with the
class-map command, and enter policy-map class configuration mode.
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ip dscp dscp-list—list of up to eight IP DSCP values to match against
incoming packets. The range is 0 to 63.
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ip precedence ip-precedence-list—list of up to eight IP precedence
values to match against incoming packets. Separate each value with
a space. The range is 0 to 7.
Chapter 27
Configuring QoS
OL-23400-01
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