Yes, some Meraki MX's support 3 WAN uplinks but with some limitations. Mainly: Only certain hardware supports the 3rd WAN port - MX75, MX85, MX95, MX105 The feature is only available from firmware 18.2 and higher The third WAN port can only be used as a backup link Additional information can be found in the link below. MultiWAN Backup Uplink - Cisco Meraki Documentation
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