From the tools page of the MX, can you ping the MS? I would also look through the logs of the MX and see if you can see anything in the logs. You can filter by types or filter by the MAC address of the MS switch port. ... View more

It's crazy since they are the same company now, but Meraki switches don't do any of the Cisco proprietary protocols except for CDP. VTP, EIGRP, PVST+ are lost in the Meraki world. If you are using VTP, make sure if you insert a Meraki switch that pruning is turned off. It will pass it though, but the Cisco switches may turn off VLANs in between. ... View more

Does your VLAN200 have internet access? And if so, is the IP address for the Meraki switch behind something doing NAT? ... View more

We use the TerraWave LAN/PoE surge suppression.  Models is TW-SP-1GBPS-10-1T.  As they have mentioned direct strikes kill everything, but if you need to protect your IDF/MDF equipment you can use something like this. These allow the PoE to go through but will kill static surges or indirect strikes. We have these in front of several MR74s. ... View more