Developing an Effective Addressing Plan for IS-IS Deployment
Integrated IS-IS implements a CLNP node-based address structure to identify routers (even within pure IP environments). These CLNP addresses are called Network Service Access Points (NSAPs) and comprise three components: an area identifier (area ID) prefix, followed by a system identifier (SysID), and an N-selector, as shown in Table 6.3.
IDP | DSP | |||
---|---|---|---|---|
AFI | IDI | High Order DSP | SysID (6 bytes) | NSEL (1 byte) |
The NSAP address shown in Table 6.3 is like a combination of an IP address and the upper-layer protocol in the IP header. The following list explains the different elements:
AFI— This is the 1-byte authority and format ID that designates the formatting as ...
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