CLI Guide

Layer 2 Switching Commands 442
Default Configuration
The default MTU size is 1518 bytes (1522 bytes for VLAN tagged frames).
Command Modes
Global Configuration mode
User Guidelines
Dell EMC Networking N-Series switches do not fragment received packets.
The IPv4 and IPv6 MTU are set to the link MTU minus 18 bytes. IP packets
forwarded in software are dropped if they exceed the IP MTU. Packets
originated on the router, such as OSPF packets, may be fragmented by the IP
stack. OSPF advertises the IP MTU in the Database Description packets it
sends to its neighbors during database exchange. If two OSPF neighbors
advertise different IP MTUs, they will not form an adjacency (unless OSPF
has been instructed to ignore differences in IP MTU with the ip ospf
mtuignore command).
The allowed range is 1298 to 9216. This allows for configuration of an IPv4
and IPv6 MTU of 1280 to 9198.
In conformance with RFC 2460, the system performs IPv6 path MTU
discovery for IPv6 packets originated by the switch. This may result in
individual connections using an IPv6 MTU less than that configured by the
network operator.