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LB9 User’s Guide 697/1523
7.2.2.8 ip mtu
This command sets the IP Maximum Transmission Unit (MTU) on a routing interface or range of
interfaces. The IP MTU is the size of the largest IP packet that can be transmitted on the interface
without fragmentation. Forwarded packets are dropped if they exceed the IP MTU of the outgoing
interface.
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 mtu-ignore
command.)
<68-12270> - The IP MTU on a routing interface. The range is 68 to 12270.
no - Reset the ip mtu to the default value.
Default Setting
The default value is 1500.
Command Mode
Interface Config
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