Introduces QoS packet marking methods for differentiating traffic across IP, MPLS, GRE, SRv6, VXLAN, and Layer 2 interfaces. It covers marking behavior, configuration workflows, benefits, and platform limitations.
This chapter describes how QoS packet marking enables differentiated traffic treatment by assigning priority values—such as IP precedence, DSCP, CoS, and MPLS EXP bits—to packets, ensuring consistent handling of traffic classes across interfaces and network domains.
Packet marking
Introduces QoS packet marking for traffic differentiation, including unconditional marking, MPLS marking modes, IP-to-MPLS marking, tunnel marking, and Layer 2 marking behavior.
Unconditional QoS packet marking
Details unconditional QoS packet marking, including how policies assign marking values without conditional checks and how marked traffic receives consistent QoS treatment.
QoS marking modes for MPLS traffic
Explains QoS marking modes for MPLS traffic, including uniform, pipe, and short-pipe behavior for preserving or changing QoS markings across MPLS networks.
QoS marking for IP-to-MPLS traffic
Details QoS marking for IP-to-MPLS traffic, including DSCP-to-EXP mapping, ingress remarking, platform support, limitations, benefits, and configuration requirements for consistent service differentiation.
QoS marking in tunneling and encapsulation scenarios
Introduces how QoS markings are preserved, mapped, or redefined when packets undergo encapsulation across GRE, MPLS, or Segment Routing tunnels.
QoS marking on Layer 2 subinterfaces
Provides instructions for QoS marking on Layer 2 interfaces and subinterfaces, including MQC policy use, CoS and DEI remarking, traffic classification, and egress policy verification.