QoS

QoS in netverdict is a policy and packet-metadata model. It can classify traffic, mark DSCP, and preserve configured policy intent for labs and config review. It is not a queueing ASIC simulator.

Support level

Area	Level	Notes
Classification	Behaviour model	Class maps match ACLs/protocols where implemented.
Marking	Supported	DSCP/precedence metadata can be set on packets.
Policy maps	Supported	Class/action structure is parsed and emitted.
Service policy	Supported	Interface attachment is represented.
Policing/shaping	Config model	Parsed/stored; detailed queue timing is not modelled.
Scheduling	Not modelled	No hardware queue simulation.

Standards coverage

Standard	Coverage	Notes
RFC 2474	Behaviour model	DSCP marking field semantics.
Cisco MQC	Behaviour model	Class-map / policy-map / service-policy structure.

Feature matrix

Feature	Status	Notes
class-map	Supported	Match criteria container.
policy-map	Supported	Action container.
match access-group	Supported	ACL-based classification.
set dscp	Supported	Packet metadata marking.
police	Config model	Stored for config fidelity.
shape	Config model	Stored for config fidelity.
service-policy input/output	Supported	Interface attachment.

Vendor command matrix

Command	IOS-style	Junos-style	VyOS-style	Notes
class-map match-any VOICE	Supported	n/a	Partial	Classification.
policy-map WAN-OUT	Supported	n/a	Partial	Policy container.
set dscp ef	Supported	Partial	Partial	Marking.
service-policy output WAN-OUT	Supported	Partial	Partial	Interface attachment.
show policy-map interface	Supported	Partial	Partial	Policy view.

Behaviour notes

QoS actions affect packet metadata that other parts of the engine can carry. Queue occupancy, serialization delay, and scheduler fairness are intentionally not inferred from configured bandwidth statements.

Examples

Canonical example

configure terminal
class-map match-any VOICE
 match access-group name VOICE-RTP
policy-map WAN-OUT
 class VOICE
  set dscp ef
interface GigabitEthernet0/0
 service-policy output WAN-OUT
end
show policy-map interface GigabitEthernet0/0

Vendor styles

IOS-style

class-map match-any VOICE
 match access-group name VOICE-RTP
policy-map WAN-OUT
 class VOICE
  set dscp ef
interface GigabitEthernet0/0
 service-policy output WAN-OUT

Junos-style

set class-of-service classifiers dscp VOICE forwarding-class expedited-forwarding loss-priority low code-points ef
set class-of-service interfaces ge-0/0/0 unit 0 rewrite-rules dscp WAN-OUT

VyOS-style

set qos policy shaper WAN-OUT class 10 match VOICE ip dscp ef
set qos interface eth0 egress WAN-OUT

Known limits

LLQ/WFQ scheduler behaviour, WRED curves, shaping token buckets, hierarchical queue timing, and platform ASIC differences are not modelled.