Exam JN0-663 topic 1 question 71 discussion

A. The LSP is ignored during SPF calculation.

Correct In overload mode, the routing device advertisement is originated with all the transit routing device links (except stub) set to a metric of 0xFFFF. https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/ref/statement/overload-edit-protocols-isis.html

A is correct. Overload bit will cause other routers to ignore the LSP during SPF calculation.

C is correct: In overload mode, the routing device advertisement is originated with all the transit routing device links (except stub) set to a metric of 0xFFFF = 65535.

D is correct: In overload mode, the routing device advertisement is originated with all the transit routing device links (except stub) set to a metric of 0xFFFF

In overload mode, the routing device advertisement is originated with all the transit routing device links (except stub) set to a metric of 0xFFFF. The stub routing device links are advertised with the actual cost of the interfaces corresponding to the stub. This causes the transit traffic to avoid the overloaded routing device and take paths around the routing device. 65535 = 0xFFFF

When advertise-high-metric is configured, IS-IS does not set the overload bit. Rather, it sets the metric to 63 or 16,777,214, depending whether wide metrics are enabled. This allows the overloaded routing device to be used for transit as a last resort.

I think A too. The question is "when a router running IS-IS receives an LSP with the overload bit set" The answer C is about the metric already being set in the LSP, not what happens when a router receives LSP.

In overload mode, the routing device advertisement is originated with all the transit routing device links (except stub) set to a metric of 0xFFFF = 65535

Clearly mentioned in the official Juniper book, overload bit will cause other routers to ignore the LSP during SPF calculation. Correct Answer: A

The LSP is ignored during SPF calculation, BECAUSE the metric is set to 0xFFFF (=65535). So C is the most specific answer.

Answer is A.

C metric is set to 65535

overload bit in isis results in ignoring in spf. In ospf max metric is set to the link. My answer on the question would be A.

The correct answer should be A. This depends on how you read the question. It's not asking what the advertising router will do, rather what a receiving router does with the LSP. It will not take it into account when doing an SPF run.

well, then it's C :) 0xFFFF = 65535 https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/ref/statement/overload-edit-protocols-isis.html