Vyatta NOS documentation

Learn how to install, configure, and operate Vyatta Network Operating System (Vyatta NOS), which helps to drive our virtual networking and physical platforms portfolio.

interfaces <interface> <interface-name> ip ospf mtu-ignore

Disables detection of MTU mismatches on an interface.

set interfaces interface interface-name ip ospf mtu-ignore
delete interfaces interface interface-name ip ospf mtu-ignore
show interfaces interface interface-name ip ospf

Detection of MTU mismatches is enabled by default.

interface
A type of interface. For detailed keywords and arguments that can be specified as interface types, refer to Supported Interface Types.
interface-name
The name of an interface.

Configuration mode

interfaces {
	interfaces interface-name {
		ip {
			ospf {
				mtu-ignore
			}
		}
	}
}

Use this command to disable detection of maximum transmission unit (MTU) mismatches on an OSPF interface.

OSPF sends the MTU of the interface in a database description packet. If the MTUs of OSPF neighbors do not match, they cannot form an OSPF adjacency and will be stuck in Exstart state. MTU mismatch detection detects MTU mismatches and indicates them in the form of a debug message.

Detection of MTU mismatches is an important troubleshooting feature. If mismatch detection is not enabled, MTU mismatches can be detected only by examining configuration for both interfaces.

Some network setups exist in which MTU mismatches are unavoidable and even part of the setup. Detection of MTU mismatches for only these cases should be disabled, so that normal OSPF adjacencies can be formed.

Use the set form of this command to disable detection of MTU mismatches on an interface.

Use the delete form of this command to re-enable detection of MTU mismatches on an interface.

Use the show form of this command to display whether detection of MTU mismatches on an interface is enabled or disabled.