IT Certification CCIE,CCNP,CCIP,CCNA,CCSP,Cisco Network Optimization and Security Tips
Depending on the interface type, bandwidth, and encapsulation, AutoQoS may enable different features on the router interfaces:
Low-Latency Queuing (LLC):
- Reserves a priority queue for VoIP (RTP) traffic, providing a guaranteed but policed bandwidth.
- Other queues serve other traffic with specific bandwidth guarantees, but defer to the priority queue.
Compressed RTP (cRTP):
- Reduces the IP/UDP/RTP header from 40 bytes down to 2 bytes (without CRC) or 4 bytes (with CRC)
- Used on low-speed serial interfaces
- Improves link efficiency
- Must be applied at both ends of the link
Link Fragmentation and Interleaving (LFI):
- Fragments large data packets on slow interfaces
- Reduces jitter; voice packets will not be delayed by large data packets in the queue
- Must be applied on both ends of the link