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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<strong>Design</strong>ated Routers (D<strong>IS</strong>): <strong>IS</strong>-<strong>IS</strong><br />
• Highest priority becomes DR<br />
• 0-127, default 64<br />
• Highest MAC address tiebreaker<br />
• No backup designated router<br />
• DR can be pre-empted<br />
• Adding a router to a LAN can cause temporary<br />
instability<br />
• Adjacencies formed with all routers on LAN,<br />
not just DR<br />
• Separate L1 <strong>and</strong> L2 adjacencies on same LAN
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