Ignoring LSP Errors

You can configure the router to ignore rather than purge LSPs received with errors.

ignore-lsp-errors

Use to enable your router to ignore rather than purge IS-IS LSPs that are received with internal checksum errors.
Under normal conditions, the IS-IS protocol definition requires that received LSPs with incorrect data link checksums are to be purged by the receiver. This causes the LSP initiator to regenerate LSPs. If a network link causes data corruption while still delivering LSPs with correct data link checksums, a continuous cycle of regenerating and purging LSPs may result. This can render the network nonfunctional. Enabling this command prevents this continuous cycle from occurring because LSPs are ignored rather than purged.
Example host1(config-router)#ignore-lsp-errors
Use the no version to disable the function.
See ignore-lsp-errors