IS-IS routers generate new Link State Packets (LSPs) under the following conditions:
Interface Status Changes: When IS-IS interfaces go up or down, the link state changes, triggering LSP updates.
Periodic Updates: IS-IS periodically regenerates LSPs to ensure link-state information remains synchronized across the network.
Interface Metric Changes: Any modification to interface costs results in a new LSP to reflect the updated cost in the network.
Incorrect Option
C. Inter-area IP routes change is incorrect because IS-IS does not inherently differentiate between areas for LSP generation.
HCIP-Datacom-Core Reference
IS-IS LSP generation rules are detailed in the IS-IS configuration and implementation chapters.
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