Quality of Service What is QoS? When is it needed?

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Presentation transcript:

Quality of Service What is QoS? When is it needed? How is it implemented?

What is Quality of Service Providing preferential/priority treatment of certain types of traffic

When is Quality of Service Needed? When there is the possibility of congestion When congestion will unduly affect the quality of the user experience for some traffic

How is Quality of Service Implemented? Implemented through Queueing Default is FIFO except serial interfaces at E1 or below WFQ (Weighted Fair Queueing) default on serial interfaces at E1 or below Automatically gives low volume traffic streams preferential treatment

How is Quality of Service Implemented? CBWFQ (Class Based Weighted Fair Queueing) Traffic priorities are established Network management traffic is always given the highest priority Voice and video usually next Traffic classifications are established

How is Quality of Service Implemented? Priority queues are created and configured Priority traffic is identified and classified Packet content inspection IP precedence/TOS field – DSCP codes Outgoing traffic is placed in proper queue Queue is serviced

How is Quality of Service Implemented? LLQ (Low Latency Queueing) Adds a strict priority queue All packets in strict priority queue serviced without sharing bandwidth with other traffic