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8 QoS

Frame Relay QoS

1. Per VC Frame Relay QoS See Per VC Frame Relay QoS 2. MQC For Frame Relay MQC can be used to apply QoS settings per interface or per VC if used in conjunction with a map-class. Special MQC configuration is available for Frame Relay interfaces in regard to Class …

Policing and Shaping

1. Token Bucket The token bucket is the analogy used to describe the rate of transfer. In order to send data, we have a bucket that regularly fills with tokens. When we want to send data, we must consume 1 token for every bit (or byte, depending on how we …

Congestion Avoidance – WRED

1. Tail Drop What happens when there are more packets than the queue length? By default, all these packets are dropped, a process that is called “Tail Drop”. Unfortunately, we will never know what we dropped, maybe packets of an important flow. 2. Random Early Detection (RED) Random Early Detection …

Legacy Congestion Management

1. Architecture 1.1 Ingress In the incoming direction,there is only one software queue that is always serviced using a FIFO algorithm. To only configuration available for the input queue is the size. You can specify it with: To see information about the hold-queue, use: You can enable Selective Packet Discard …

Classification and Marking

1. Classification 1.1 Classification using MQC Classification is the process of assigning a packet to a category. QoS parameters are assigned to each category, therefore a different QoS level is applied for each packet. Classification of the packets can be done using information at Layer 2, Layer 3, Layer 4 …