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Juniper Interface no longer exists. Data collection terminated.

I started moniting Juniper switches this week and now I am seeing this error on multiple ports "Interface no longer exists. Data collection terminated"

I am using NPM 10.6 and SNMP to pull the information.

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Likely culprit would be interfaces reindexing. Juniper had a historic issue with this pre-JunOS 10.1. (Junos OS SNMP FAQs - Technical Documentation - Support - Juniper Networks)

Reboots and upgrades caused interface re-indexing.

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