L25 - Congestion control Traffic congestion in networks is...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Congestion control Traffic congestion in networks is a serious problem. Total throughput drops with offered traffic beyond some point, unless input is controlled. Show Fig. 5-21 ( old Fig. 5-25) Increased delay leads to acknowledgment timeouts, retransmissions. Large delay is unacceptable for many applications. Congestion control tools 1. Route the traffic efficiently. (But if too much traffic, not sufficient.) 2. Tools to learn of congestion problem: a) Router reports of congestion. b) End-to-end probe - measure delay. c) Allow packet-switching nodes to add congestion information to packets as they go by. # Opposite - back to information source. # In congestion direction Congestion control tools (continued) 3. Use methods to cut back the offered load. a) Ask or require source nodes to limit input, rate. b) Refuse or limit new connections. c) Window flow control or permissions 4. Discard some packets, possibly on a priority basis. Virtual Circuit Congestion Control Admission control Choice of route Knowledge, negotiation or enforcement of type and amount of the connection traffic....
View Full Document

This note was uploaded on 07/16/2011 for the course EE 362 taught by Professor Unknow during the Spring '11 term at Penn College.

Page1 / 16

L25 - Congestion control Traffic congestion in networks is...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online