What is QoS?
- http://docwiki.cisco.com/wiki/Quality_of_Service_Networking
- Quality of life insurance
- The ability to dictate traffic treatment
- Prioritization.
- Only happens with congestion.
- Shaping / Policing.
- Shaping: Mold the traffic down to a specific speed.
- Policing: ‘evil’ traffic types ( p2p / video ).
- Advanced Strategies ( WRED – Weighted random early detection)
- Drop selective TCP streams so it won’t hit max.
- Prioritization.
- Strategies to fight the enemy
- Delay ( how long it takes for a Packet A to get to the other side).
- Jitter ( Delay variation, Times between Packets A,Packet B,and Packet C taking to get to the other side)
- Packetloss
- Delay ( how long it takes for a Packet A to get to the other side).
 Audio Requirements |  Video Requirements |
|
|---|---|---|
| Jitter | < 30ms | < 30ms |
| Delay | < 150ms | < 150ms |
| Loss | < 1% | < 1% |
| QoS: | DSCP EF | DSCP AF41 |
| Bandwith | Low | High |