isis
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IS-IS Overview | IS-IS Overview | ||
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* 00—Selector | * 00—Selector | ||
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+ | **Example Net Address: 49.0001.1921.6800.1002.00** | ||
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+ | The IS-IS address consists of three parts: | ||
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+ | **Area identifier: | ||
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+ | The second two bytes of the area ID — 0001 — represent the IS-IS area number. In this example, the area number is 1. | ||
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+ | **System identifier: | ||
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+ | Although you can choose any value for the system identifier, a commonly used method is to use binary-coded decimal (BCD) which involves taking the router’s IP address (the address you assigned to the lo0 loopback interface), filling in all leading zeros, and then repositioning the decimal points to form three two-byte numbers. | ||
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+ | In this example, if you pad the IP address 192.168.1.2 with zeros, the result is 192.168.001.002. Rearranging the decimal points gives you 1921.6800.1002. | ||
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+ | **NET selector:** The final two bytes are the NET selector (NSEL). For IS-IS, they must always be 00, to indicate “this system. |
isis.1687460104.txt.gz · Last modified: 2023/06/22 18:55 by sysadm