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### Instruction:
ISIS-4-UNKNOWN_ADDRESS_FAMILY
### Response:
(Severity: 4), (Category: ROUTING), (Description: IS-IS has encountered an unrecognized address family ID. This is an internal programming error.), (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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