I did some research for my question beforehand such as this one:Cisco routers THROUGHPUT - MTU and packet size
however, it seemed not precise to explain the doubts in my head.
My primary goal is to solve the tunnel encapsulation problem for my VMware NSX-T environment. I'm currently hanging at tunnel status down problem and would like to ensure that the physical links are all correct.
in my infrastructure, the servers nodes are connected to Cisco 2960X switch and the inter-vlan routing has been enabled. all the MTU size(system, jumbo, routing...etc) were configured to 1700(for the GENEVE encapsulation).
The encapsulation tunnel between ESXi server and edge VM(which is located on ESXi) had unknown problem which prevent them from connecting to each other via tunnel encapsulation. the Pings are unreachable.(but the pings between ESXi hosts' tunnel are normal.)
I would like to doubt that there's issue on physical links before troubleshoot the ESXi virtual switch setting(its MTU is 1700 too).
here's the question:
- what kind of MTU setting/system setting will the switch disrupt the encapsulation? should i set routing MTU to 1500? or maybe the routing MTU size does nothing to this GENEVE encapsulation? (in my infrastructure, I must to utilize two different VLANs to establish the encapsulation tunnels therefore the inter-vlan routing is mandatory.)