Use the ip mtu command in Interface Configuration mode to set the IP
Maximum Transmission Unit (MTU) on a routing interface. The IP MTU is
the size of the largest IP packet that can be transmitted on the interface
without fragmentation. Packets forwarded in hardware ignore the IP MTU.
Packets forwarded in software are dropped if they exceed the IP MTU of the
Packets originated on the router, such as OSPF packets, may be fragmented
by the IP stack. The IP stack uses its default IP MTU and ignores the value set
using the ip mtu command. 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).
ip mtu [
no ip mtu
1500 bytes is the default configuration.
Interface Configuration (VLAN) mode
This command has no user guidelines.
Specifies the maximum transmission size of an IP frame.
IP Routing Commands