Routing Update Policies

• Threshold based

- update triggered if relative change in bandwidth exceeds a threshold value

- more accurate for smaller values of available bandwidth

• Class based

- update triggered when a class boundary is crossed

- with exponential class sizes, more accurate for smaller values of available bandwidth

- can advertise quantized values (value at the middle of the new available bandwidth class)

• Using clamp-down timers enforces a minimum spacing between two successive updates

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