NSEL

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The NSEL (Network-Selector) is a field in th e Network Service Access Point (NSAP) address that identifies the network layer service to which a packet should be sent. This part of the address for a router will always be 0x00. In the IS-IS routing protocol, the field is sometimes referred to as the SEL field.^{[1] [2]}

[edit] References

1. ^ Intermediate System-to-Intermediate System (IS-IS) Basics for the Cisco BSCI Exam.
2. ^ Cisco Press - 1587200856 - CCNP BSCI Exam Certification Guide, Third Edition.