- WAN link speed 128 kbps
- Voice requirements 30 kbps
- VoIP is Precedence 5 (counts as 6 data sessions)
- 1 VoIP session, 5 data sessions
- Voice gets up to 6/(6+5)*128 = 69 kbps (enough)
- 1 VoIP session, 20 data sessions
- Voice gets up to 6/(6+20)*128 = 29 kbps (problem)
- Benefits
- Simple configuration (classification does not have to be configured)
- Guarantees throughput to all flows
- Drops packets of most aggressive flows
- Supported on most platforms
- Supported in all IOS versions (above 11.0)
- Drawbacks
Weighted Fair Queuing Configuration - Congestive discard threshold (CDT)
- Number of messages allowed in the WFQ system before the router starts dropping new packets for the longest queue
- Value can range from 1 to 4096 (default is 64)
- fair-queue [cdt [dynamic-queues [reservable-queues]]]
Weighted Fair Queuing Configuration (cont.) - dynamic-queues
- Number of dynamic queues used for best-effort conversations (values are: 16, 32, 64, 128, 256, 512, 1024, 2048, and 4096–the default is 256)
- reservable-queues
- Number of reservable queues used for reserved conversations in the range 0 to 1000 (used for interfaces configured for features such as RSVP - the default is 0)
- fair-queue [cdt [dynamic-queues [reservable-queues]]]
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