IS-IS and OSPF: Network Design Comparisons and ... - JANOG
IS-IS and OSPF: Network Design Comparisons and ... - JANOG
IS-IS and OSPF: Network Design Comparisons and ... - JANOG
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Metrics: <strong>OSPF</strong><br />
• Dimensionless metric<br />
• Large metric field<br />
• Cost<br />
• Type 1 LSA = 16 bits<br />
• Type 3, 4, 5, <strong>and</strong> 7 LSA = 24 bits<br />
• Cost = Reference BW / Interface BW<br />
• Default Reference BW = 100 Mbps<br />
• If (Ref BW / Interface BW) > 1, Cost = 1<br />
• Cost can also be set arbitrarily<br />
• External Metrics<br />
• Type 1 (E1) = Assigned cost + cost to ASBR<br />
• Type 2 (E2) = Assigned cost only
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