With the MX84 and MX100, you can only have 2 WAN uplinks.. there is a spot for a USB cellular modem for failover WAN Link... https://documentation.meraki.com/MX/MX_Overviews_and_Specifications/MX84_Overview_and_Specifications According to Meraki's sizing guide, it doesn't look like any of the MX's allow 3 WAN uplinks ... https://meraki.cisco.com/lib/pdf/meraki_datasheet_mx.pdf
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