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IS-IS and OSPF: Network Design Comparisons and ... - JANOG

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SPF Calculation Example<br />

• Loop-free, lowest-cost path to every node<br />

R2<br />

2<br />

1<br />

2<br />

3<br />

R1<br />

R5<br />

3<br />

1<br />

2<br />

4<br />

5 4<br />

R4<br />

2<br />

3<br />

4<br />

R3<br />

2<br />

Path<br />

R2-R2, 0<br />

R2-R3, 1<br />

R2-R1, 2<br />

R2-R4, 2<br />

R1-R5, 4<br />

R4-R6, 4<br />

2<br />

R6<br />

1

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