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FTOS Configuration Guide for the C-Series - Force10 Networks

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• 3: connection to a stub network IP network/subnet number<br />

• 4: virtual link neighboring router ID<br />

Virtual Links<br />

In <strong>the</strong> case in which an area cannot be directly connected to Area 0, you must configure a virtual link<br />

between that area and Area 0. The two endpoints of a virtual link are ABRs, and <strong>the</strong> virtual link must be<br />

configured in both routers. The common non-backbone area to which <strong>the</strong> two routers belong is called a<br />

transit area. A virtual link specifies <strong>the</strong> transit area and <strong>the</strong> router ID of <strong>the</strong> o<strong>the</strong>r virtual endpoint (<strong>the</strong> o<strong>the</strong>r<br />

ABR).<br />

A Virtual Link cannot be configured through a Stub Area or NSSA.<br />

Router Priority and Cost<br />

Router priority and cost is <strong>the</strong> method <strong>the</strong> system uses to “rate” <strong>the</strong> routers. For example, if not assigned,<br />

<strong>the</strong> system will select <strong>the</strong> router with <strong>the</strong> highest priority as <strong>the</strong> DR. The second highest priority is <strong>the</strong><br />

BDR.<br />

Priority is a numbered rating 0-255. The higher <strong>the</strong> number, <strong>the</strong> higher <strong>the</strong> priority.<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 535

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