Scheduling and buffer management are two key functions that a router performs on its queues. (i) What is each of these techniques concerned with? (ii) Describe how First-In-First-Out (FIFO) scheduling can be detrimental to application performance and discuss advanced techniques to solve this problem following our discussion of [Demers+98, Fair Queueing]. (iii) Describe how Tail Drop buffer management can be detrimental to application performance and discuss advanced techniques to solve this problem following our discussion of [Floyd+93, Random Early Detection].
Scheduling and buffer management are two key functions that a router performs on its queues. (i) What is each of these techniques concerned with? (ii) Describe how First-In-First-Out (FIFO) scheduling can be detrimental to application performance and discuss advanced techniques to solve this problem following our discussion of [Demers+98, Fair Queueing]. (iii) Describe how Tail Drop buffer management can be detrimental to application performance and discuss advanced techniques to solve this problem following our discussion of [Floyd+93, Random Early Detection].
Computer Networking: A Top-Down Approach (7th Edition)
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Transcribed Image Text:**Scheduling and Buffer Management in Routers**
Scheduling and buffer management are two key functions that a router performs on its queues.
(i) **Concerns of Each Technique**:
- **Scheduling**: Determines the order in which packets are transmitted from a router's queue.
- **Buffer Management**: Deals with how packets are stored and dropped within a router's buffer.
(ii) **First-In-First-Out (FIFO) Scheduling**:
- **Detrimental Effects**: Can lead to increased packet delays and congestion, especially for time-sensitive applications.
- **Advanced Techniques**:
- **Fair Queueing (Demers+98)**: Allocates bandwidth fairly among different flows to improve performance and reduce delays.
(iii) **Tail Drop Buffer Management**:
- **Detrimental Effects**: Can cause global synchronization, leading to bursty drops and reduced throughput.
- **Advanced Techniques**:
- **Random Early Detection (Floyd+93)**: Proactively drops packets before the buffer is full to prevent congestion and improve flow handling.
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