Troubleshooting a fiber optic link on Cisco switches

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Mikrotik releases 6.45.7

MAJOR CHANGES IN v6.45.7:
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!) lora – added support for LoRaWAN low-power wide-area network technology for MIPSBE, MMIPS and ARM;
!) package – accept only packages with original filenames (CVE-2019-3976);
!) package – improved package signature verification (CVE-2019-3977);
!) security – fixed improper handling of DNS responses (CVE-2019-3978, CVE-2019-3979);
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