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DES-7200 Configuration Guide Chapter 3 MPLS QOS
Configuration
3-6
On router P, the LSP DiffServ information of egress label is obtained from
the LSP DiffServ information of ingress label.
On egress LSR, LSP DiffServ information must be propagated to the
Tunneling DiffServ information.
Note
Currently, Uniform Model is not supported by switches.
3.1.5 Protocol specification
RFC 2475: The Architecture for Differentiated Services
RFC 3270: Multi-Protocol Label Switching (MPLS) Support of Differentiated
Services
3.1.6 Product support
Currently, only DES-7200 series products support MPLS QoS. For DES-7200
series products, there are two MPLS modes: centralized (based on MPLS
service card) and distributed. The support to MPLS QoS is different under these
two modes.
Centralized MPLS mode (based on MPLS service card)
Only supports CoS-to-EXP Map, which would be applied to the interface.
Distributed MPLS mode
All configurations in "Configuration Guide" are supported.
3.1.6.1 <Inner CoS>
Inner CoS represents the inner precedence of packets on DES-7200 series
switches. Inner CoS determines the precedence of packets during queuing and
scheduling on the router or switch. Inner CoS functions as 802.1P bits and uses
the same value range of 0-7.
The DES-7200 series switches, the Inner CoS is mainly related tot he QoS trust
mode of interface:
Interface trust mode is set to untrusted (default configuration)
When the incoming packets are IPv4 packets (no matter whether Tag is carried
by packets), the DSCP value of packets will be modified as per the default CoS
value (configurable, 0 by default) and CoS-to-DSCP Map of the interface, and
the inner CoS is further configured as per DSCP-to-CoS Map. The final queuing
of packets will be determined as per the inner CoS.