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### Instruction:
ISIS-4-INTF_PROTECT_INFRA_UPDATE
### Response:
(Severity: 4), (Category: ROUTING), (Description: IS-IS failed to register or unregister with protect infrastructure for high priority link-down notifications on the specified interface. IS-IS will still react to regular link-down events.), (Recommended Action: Copy the error message exactly as it appears on the console or in the system log, call your Cisco technical support representative and provide the representative with the gathered information.)
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