Can you ping the dns servers or do nslookups to that server and start firewall logging. See if something get blocked/allowed https://documentation.meraki.com/MX/Firewall_and_Traffic_Shaping/Firewall_Logging
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I should be under network- wide > general Or org> settings >snmp https://documentation.meraki.com/General_Administration/Monitoring_and_Reporting/Meraki_Device_Reporting_-_Syslog%2C_SNMP%2C_and_API#SNMP_Configuration https://documentation.meraki.com/General_Administration/Monitoring_and_Reporting/SNMP_Overview_and_Configuration#Configuration
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Did you add vlan 20 on the trunk between mx and core switch? Did you remove the static route for vlan20 from the mx to the coreswitch? Did you remove the vlan 20 svi from the switch?
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On 30.7 has problems related to customers with many ssid configs. But the problems described in release notes sound different then yours.
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https://documentation.meraki.com/General_Administration/Tools_and_Troubleshooting/Using_the_Cisco_Meraki_Device_Local_Status_Page#Accessing_the_Local_Status_Page Make sure local access is enabled if your mx doesnt have a dedicated management port https://documentation.meraki.com/General_Administration/Tools_and_Troubleshooting/Using_the_Cisco_Meraki_Device_Local_Status_Page#Controlling_Remote_Access_to_the_Local_Status_Page
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You can have sticky flows with gracefull failover. You could do a packet capture on that port to see what traffic is still active https://documentation.meraki.com/MX/Firewall_and_Traffic_Shaping/Connection_Monitoring_for_WAN_Failover "Existing flows will remain on the backup path until expiry"
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you claimed one license/serial but every device has its own license. You can just split the license to a different org if you are admin of both orgs https://documentation.meraki.com/General_Administration/Licensing/How_to_do_a_License_Transfer_in_Cotermination
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You can't change the timers before it marks the wan port as down. https://documentation.meraki.com/Architectures_and_Best_Practices/Cisco_Meraki_Best_Practice_Design/Best_Practice_Design_-_MX_Security_and_SD-WAN/Meraki_SD-WAN#Failover_Times But For sdwan traffic you are able to set policies. https://documentation.meraki.com/MX/Firewall_and_Traffic_Shaping/MX_Load_Balancing_and_Flow_Preferences#VPN_Traffic_and_Custom_Performance_Classes This can also be done for local breakout traffic but then you need sdwan+ license https://documentation.meraki.com/Architectures_and_Best_Practices/Cisco_Meraki_Best_Practice_Design/Best_Practice_Design_-_MX_Security_and_SD-WAN/SD-WAN_Internet_Policies_(SD-Internet)#Overview
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https://documentation.meraki.com/MX/Firewall_and_Traffic_Shaping/SD-WAN_and_Traffic_Shaping#Traffic_shaping_rules https://documentation.meraki.com/General_Administration/Cross-Platform_Content/Simple_Traffic_Shaping_Strategy
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18.211.3 reports a bug that sounds similar: Due to an issue under investigation MX75, MX85, MX95, MX105, MX250, and MX450 appliances may report an erroneous spike in network traffic usage.
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https://documentation.meraki.com/General_Administration/Support/Resetting_Cisco_Meraki_Devices_to_Factory_Defaults#Overview Make sure that they dont have internet connectivity, because they will pull config from the cloud asap.
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Not possible. I think the closest you get is setting the subnet with a priority, for example set he guest subnet to prio low https://documentation.meraki.com/MX/Firewall_and_Traffic_Shaping/Using_Packet_Prioritization_on_a_Traffic_Shaping_Rule
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Doesnt the invoice give any leads to previous owner? https://documentation.meraki.com/General_Administration/Inventory_and_Devices/Cisco_Meraki_Devices_purchased_Second_Hand#Devices_are_Removed_from_the_Previous_Owner's_Dashboard_Account
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The best way for solving issues is to contact meraki support to help you with this issue Or You can revert back to older firmware If you want the forum to help we would need more detailed info of what you are experiencing, when, and related event logs
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If the vlan is just layer2 on the other switches, and you trunk that vlan between the L2 switch and the Switch that has the L3interface+forwarder then you dont need to do anything on the other switches
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Not sure if this still a thing. But back in days you needed to config this on cisco switches to allow 3rd party sfp's :service unsupported-transceiver
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