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Shaping Delay Traffic shaping causes additional delays by serving queues more slowly than if traffic shaping were not used. Why should a router slow down sending packets if it does not have to? Well, traffic shaping helps match the overall forwarding rate of traffic when a carrier might discard traffic if the rates exceed the contracted rate. So, which is better? ■ Sending packets really fast and having them be dropped ■ Sending packets more slowly, but not having them be dropped The right answer is—it depends!

On some occasions, you might not actually even get CIR worth of bandwidth. However, the Frame Relay provider commits to engineering a network so that they can support at least the CIRs of their collective VCs. In effect, bandwidth per VC equals the CIR of each VC, respectively. Unfortunately, bandwidth on multiaccess networks is not that simple. Consider the fact that R3 has a 256-kbps access rate, and R4 has a T1 access rate. When R3 sends, it must send the bits at access rate—otherwise, Layer 1 functions would not work at all.

Later we moved to the big city of Snellville, just outside Atlanta. At the bank in Snellville, people were in a bigger hurry. So, there was one line and many tellers. As it turns out, and as queuing theory proves, the average time in the queue is decreased with one queue served by many tellers, rather than one queue for each teller. Therefore, if one slow person (Bubba) was talking to teller 1, when teller 2 became available, my dad and I could go next, rather than the person who showed up at the bank after we did.

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Cisco - Catalyst 6000 Product Update 1104

by Daniel

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