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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Area Structure: <strong>IS</strong>-<strong>IS</strong><br />
• Area boundaries fall between routers<br />
• External reachability information in L2 LSPs only<br />
• Router types<br />
• L1<br />
• L2<br />
• L1/L2<br />
Area 1<br />
L1<br />
L1/L2<br />
L1/L2<br />
Area 2<br />
L1<br />
Area 3<br />
External<br />
Routes<br />
L2<br />
L2