Lers At The Ip Edge (Mpls, Mpls Vpn) - Cisco WS-SUP32-GE-3B - Supervisor Engine 32 Software Configuration Manual

Chapter 39 Configuring MPLS QoS
MPLS to Ethernet
For MPLS to Ethernet, the ingress interface, MPLS QoS, and egress interface features are similar to
corresponding features for MPLS to IP except for the case of EoMPLS decapsulation where egress IP
policy cannot be applied (packets can be classified as MPLS only). For more information, see these
sections:
•
•
•
•

LERs at the IP Edge (MPLS, MPLS VPN)

This section provides information about QoS features for LERs at the ingress (CE-to-PE) and egress
(PE-to-CE) edges for MPLS and MPLS VPN networks. Both MPLS and MPLS VPN support general
MPLS QoS features. See the
QoS information.
IP to MPLS
The PFC3B provides the following MPLS QoS capabilities at the IP-to-MPLS edge:
•
•
•
This section provides information about the MPLS QoS classification that the PFC3B supports at the
IP-to-MPLS edge. Additionally, this section provides information about the capabilities provided by the
ingress and egress interface modules.
Classification for IP-to-MPLS
The PFC3B ingress and egress policies for IP traffic classify traffic on the original received IP using
match commands for IP precedence, IP DSCP, and IP ACLs. Egress policies do not classify traffic on
the imposed EXP value nor on a marking done by an ingress policy.
After the PFC3B applies the port trust and QoS policies, it assigns the internal DSCP. The PFC3B then
assigns the EXP value based on the internal DSCP-to-EXP global map for the labels that it imposes. If
more than one label is imposed, the EXP value is the same in each label. The PFC3B preserves the
original IP ToS when the MPLS labels are imposed.
The PFC3B assigns the egress CoS based on the internal DSCP-to-CoS global map. If the default internal
DSCP-to-EXP and the internal DSCP-to-CoS maps are consistent, then the egress CoS has the same
value as the imposed EXP.
OL-11439-03
Classification for MPLS-to-IP, page 39-11
Classification for MPLS-to-IP MPLS QoS, page 39-11
Classification at MPLS-to-IP Ingress Port, page 39-11
Classification at MPLS-to-IP Egress Port, page
"MPLS VPN" section on page 39-12
Assigning an EXP value based on the mls qos trust or policy-map command
Marking an EXP value using a policy
Policing traffic using a policy
Catalyst Supervisor Engine 32 PISA Cisco IOS Software Configuration Guide, Release 12.2ZY
39-12.
for additional MPLS VPN-specific
Understanding MPLS QoS
39-9