JNCIP-SP: Juniper Networks Certified Professional – Service Provider (2022) — Question 11

What occurs when a router running IS-IS receives an LSP with the overload bit set?

Answer options

• A. The LSP is ignored during SPF calculation.
• B. The LSP is not added to the link-state database.
• C. The LSP's metric will be set to 65535.
• D. The LSP's metric will be set to 16777215.

Correct answer: C

Explanation

When a router running IS-IS receives an LSP with the overload bit set, it assigns a metric of 65535 to the LSP, indicating that the route is considered unreachable. Option A is incorrect because the LSP is not ignored in SPF calculation; it is processed but with the high metric. Option B is wrong as the LSP is still added to the database but with the defined metric. Option D is incorrect since the correct metric for an overloaded LSP is specifically set to 65535.