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DES-7200 Configuration Guide Chapter 3 MPLS QOS
Configuration
3-8
When the incoming packets are MPLS packets, the inner CoS will be configured
as per the EXP value of the topmost label of incoming packets and EXP-to-CoS
Map, and the final queuing of packets will be determined as per the inner CoS.
When the incoming packets are non-MPLS packets, trust CoS will be handled
as per the interface trust mode.
Note
EXP value newly imposed upon the label is mapped from the inner
CoS of incoming packets through the Cos-to-EXP Map attached to
the egress interface.
3.2 Default Configurations
Before proceeding with MPLS QoS configuration, the following information
related to MPLS QoS shall be clarified:
All configurations of IP QoS apply to MPLS QoS;
MPLS QoS allows the differentiation of MPLS packets;
When one or multiple labels are inserted into an IP packet, the default
behavior is to map inner CoS to all EXP bits added into the label through
the CoS-to-EXP Map attached to the egress port. By default, the first group
of CoS-to-EXP Map is attached to all ports receiving and sending MPLS
packets.
Supporting one group of EXP-to-Cos Map and 8 groups of CoS-to-EXP
Maps.
By default, MPLS QoS feature is disabled, namely the device will treat all
packets equally. The following tables show the default configurations of MPLS
QoS:
Function Default setting
Interface trust mode Untrusted
MPLS EXP copying Disabled
Default EXP-to-CoS Map
EXP value CoS value
0 0
1 1
EXP to
CoS
2 2