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标签：qos

tc netem: Simulating Latency and Packet Loss

tc netem: Simulating Latency and Packet Loss

Use tc netem to reproduce WAN conditions: delay and jitter, loss models, reordering and corruption, plus the placement rules that matter.

admin admin 2026-10-14
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Junos Class of Service: Classifiers and Schedulers

Junos Class of Service: Classifiers and Schedulers

Build a Junos CoS configuration: behaviour aggregate classifiers, forwarding classes and queues, schedulers with transmit rates, and RED drop profiles

admin admin 2026-10-13
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Hierarchical QoS: Parent Shaping with Child Queueing

Hierarchical QoS: Parent Shaping with Child Queueing

Build HQoS policies: shape a 100M interface to a 20M service rate, nest a child queueing policy inside it, and verify the nested statistics.

admin admin 2026-10-12
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DCBX and LLDP-DCB: Configuration and Verification

DCBX and LLDP-DCB: Configuration and Verification

How DCBX negotiates PFC and ETS over LLDP, why both global and interface enablement are required, and how to verify the TLVs on both ends.

admin admin 2026-10-12
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Arista EOS Queue Counters and Congestion Troubleshooting

Arista EOS Queue Counters and Congestion Troubleshooting

Read Arista EOS queue counters, enable LANZ queue monitoring and find which egress queue is dropping traffic during congestion events.

admin admin 2026-10-12
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QoS Trust Boundary on Cisco Switches: DSCP vs CoS

QoS Trust Boundary on Cisco Switches: DSCP vs CoS

Configure a Cisco QoS trust boundary correctly: enable QoS globally, choose DSCP or CoS trust, and avoid the rewrite that erases arriving markings.

admin admin 2026-10-12
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Time-Sensitive Networking: 802.1Qbv Scheduling Explained

Time-Sensitive Networking: 802.1Qbv Scheduling Explained

How TSN makes Ethernet deterministic: 802.1AS timing, 802.1Qbv time-aware scheduling, frame preemption and a practical configuration workflow.

admin admin 2026-10-01
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Control Plane Policing (CoPP): Protecting the CPU

Control Plane Policing (CoPP): Protecting the CPU

Configure CoPP so a flood of ARP, ICMP or routing packets cannot take down a switch: class maps, policy maps, default policies and safe tuning rules.

admin admin 2026-09-24
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WRED vs Tail Drop: Congestion Avoidance Explained

WRED vs Tail Drop: Congestion Avoidance Explained

How WRED differs from tail drop, what the min/max thresholds and mark probability denominator actually do, and how to size them without dropping good

admin admin 2026-09-24
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ArubaOS-CX QoS Trust and Queue Profiles Guide

ArubaOS-CX QoS Trust and Queue Profiles Guide

ArubaOS-CX QoS configuration: qos trust cos or dscp, cos-map and dscp-map, custom queue-profile with map queue, schedule-profile DWRR weights and appl

admin admin 2026-09-23
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