Classifier-based traffic marking

Classifier-based per-port or per-VLAN QoS policies support the following traffic-marking actions. Note that globally-configured QoS traffic marking (802.1p and DSCP prioritization), classifier-based QoS policies also support IP precedence and rate limiting.

Layer 2 802.1p prioritization

Controls the outbound port queue priority for traffic leaving the switch, and (if traffic exits through a VLAN-tagged port) sends the priority setting in packet headers to downstream devices.

Layer 3 IP precedence-bitmarking

Enables the switch to set, change, and honor prioritization policies by using the IP precedence bits in the ToS byte of IPv4 packet headers and Traffic Class byte of IPv6 headers.

Layer 3 DSCP marking

Enables the switch to set, change, and honor prioritization policies by using the Differentiated Services (Diffserv) bits in the ToS byte of IPv4 headers and Traffic Class byte of IPv6 headers.

Rate limiting

Enables a port or VLAN interface to allow only the specified amount of bandwidth to be used for inbound traffic. When traffic exceeds the configured limit, it is dropped.

NOTE:
After you apply a classifier-based QoS policy on a port or VLAN interface:
  • The 802.1p (CoS) priority and DSCP codepoint marking applied to classified packets override any 802.1p and DSCP codepoint values that are globally-configured using the QoS commands.

  • The rate limit applied to classified packets overrides any globally configured rate limit. See the ArubaOS-Switch Management and Configuration Guide for more information.