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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
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Chapter 42 Configuring PFC3BXL or PFC3B Mode MPLS QoS
Understanding PFC3BXL or PFC3B Mode MPLS QoS
Ethernet to MPLS
For Ethernet to MPLS, the ingress interface, PFC3BXL or PFC3B mode MPLS QoS, and egress interface
features are similar to corresponding features for IP to MPLS. For more information, see these sections:
•
Classification for IP-to-MPLS, page 42-9
•
Classification for IP-to-MPLS PFC3BXL or PFC3B Mode MPLS QoS, page 42-10
•
Classification at IP-to-MPLS Ingress Port, page 42-10
•
Classification at IP-to-MPLS Egress Port, page 42-10
MPLS to Ethernet
For MPLS to Ethernet, the ingress interface, PFC3BXL or PFC3B mode 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:
•
Classification for MPLS-to-IP, page 42-11
•
Classification for MPLS-to-IP PFC3BXL or PFC3B Mode MPLS QoS, page 42-12
•
Classification at MPLS-to-IP Ingress Port, page 42-12
•
Classification at MPLS-to-IP Egress Port, page 42-12
.
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
“MPLS VPN” section on page 42-12
for additional MPLS VPN-specific
QoS information.
IP to MPLS
The PFC3BXL or PFC3B provides the following MPLS QoS capabilities at the IP-to-MPLS edge:
•
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
This section provides information about the MPLS QoS classification that the PFC3BXL or 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 PFC3BXL or 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.
