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### Instruction:
What is the purpose of the spf-interval command in IS-IS?
### Response:
The spf-interval command is used to configure the minimum interval between consecutive SPF calculations. By default, the SPF interval is 5 seconds. Increasing this interval reduces the CPU load on the router but increases the convergence time after a topology change. The trade-off between CPU utilization and convergence time should be considered.
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