Friday, February 16, 2007

 

Virtual Channels vs Data Path

This caused me a little confusion early on, but now I don't know why. However, I know it's causing other people some confusion too. Data path is the physical path the data frames travel. The path is determined by the routing protocol.

Virtual channels are logical channels inside a data path. It's generally used as a throttling mechanism so a particular stream of traffic doesn't hog up more than its shared of the data path throughput. Virtual channel can be implemented with a credit model between peers. Also, each virtual channel generally has its own queue.

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