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  1. QoS Marking. QoS profile matching by ingress packet headers, then egress header alternation according to the assigned QoS profiles (introduced in RouterOS v7.10).
  2. QoS Enforcement. Avoid or resolve congestion based on the assigned QoS profiles and traffic shaping (introduced in RouterOS v7.13 for 98DX224S, 98DX226S, and 98DX3236 switch chips, and extended to all capable switch chips starting from RouterOS v7.15).
  3. QoS Policy. Assign QoS profiles via ACL rules (introduced in RouterOS v7.15).
  4. Extra QoS Features: WRED (Weighted Random Early Detection), ECN notification and processing (introduced in RouterOS v7.15 to capable switch chips).
  5. Traffic shaping (introduced per-queue traffic shaping in RouterOS v7.15).

QoS Terminology

These terms will be used throughout the article.

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PropertyDescription
qos-hw-offloading (yes | no; Default: no)Allows enabling QoS for the given switch chip (if the latter supports QoS).
Info

When you enable QoS, turning off the qos-hw-offloading setting will not completely revert to the previous functionality. It is recommended to reboot the device after disabling it.

Port settings

Sub-menu:/interface/ethernet/switch/qos/port

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By default, ports are untrusted and receive the default QoS profile (Best-Effort, PCP=0, DSCP=0), where priority fields are cleared from the egress packets.

map 
PropertyDescription
egress-rate-queue0 .. egress-rate-queue7 (integer: 0..18446744073709551615; Default !egress-rate-queuex)Sets egress traffic limitation (bits per second) for specific output queue. It is possible to specify the limit using suffixes like k, M, or G to represent kbps, Mbps, or Gbps. This setting can be combined with the overall per-port limit egress-rate (see /in/eth/sw/port).
map (name; Default: default)Allows user-defined QoS priority-to-profile mapping in the case of a trusted port or host (see /in/eth/sw/qos/map).
profile (name; Default: default)The name of the QoS profile to assign to the ingress packets by default (see /in/eth/sw/qos/profile).
trust-l2 (ignore | trust | keep; Default: ignore)

Whenever to trust the Layer 2 headers of the incoming packets (802.1p PCP field):

  • ignore - ignore L2 header; use the port's profile value for all incoming packets;
  • trust - use PCP field of VLAN-tagged packets for QoS profile lookup in map. Untagged packets use the port's profile value. Forwarded VLAN or priority-tagged packets receive the PCP value from the selected QoS profile (overwriting the original value).
  • keep - trust but keep the original PCP value in forwarded packets. 
trust-l3 (ignore | trust | keep; Default: ignore)

Whenever to trust the Layer 3 headers of the incoming packets (IP DSCP field):

  • ignore - ignore L3 header; use either L2 header or the port's profile (depends on trust-l2).
  • trust - use DSCP field of IP packets for QoS profile lookup in map. Forwarded/routed IP packets receive the DSCP value from the selected QoS profile (overwriting the original value).
  • keep - trust but keep the original DSCP value in forwarded/routed packets.
tx-manager (name; Default: default)

The name of the Transmission Manager that is responsible for enqueuing and transmitting packets from the given port (see /in/eth/sw/qos/tx-manager).

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