Ensuring zero packet loss and low jitter for mission-critical enterprise voice (VoIP), video telepresence, and database replication requires fine-tuned Quality of Service (QoS) classification and queue scheduling.
1. DSCP Marking & Class Allocation Guidelines
| Traffic Category | DSCP Value / Name | IPP Value | Queue Scheduling Strategy |
|---|---|---|---|
| VoIP Audio (RTP) | DSCP 46 (EF - Expedited Forwarding) | 5 | Strict Priority (PQ) Queue (Bandwidth Capped) |
| Video Conferencing | DSCP 34 (AF41 - Assured Forwarding) | 4 | Class-Based Weighted Fair Queue (CBWFQ) |
| Call Signaling (SIP) | DSCP 24 (CS3) / DSCP 26 (AF31) | 3 | Guaranteed Minimum Bandwidth Reservation |
| Best Effort Data | DSCP 0 (Default / BE) | 0 | Fair Queueing with Weighted Random Early Detection (WRED) |