Administrator Guide

Layer 3 Routing Commands 1750
ip ospf mtu-ignore
Use the ip ospf mtu-ignore command in Interface Configuration mode to
disable OSPF maximum transmission unit (MTU) mismatch detection.
OSPF Database Description packets specify the size of the largest IP packet
that can be sent without fragmentation on the interface. When a router
receives a Database Description packet, it examines the MTU advertised by
the neighbor. By default, if the MTU is larger than the router can accept, the
Database Description packet is rejected and the OSPF adjacency is not
established. Use the no form of the command to enable OSPF maximum
transmission unit (MTU) mismatch detection.
Syntax
ip ospf mtu-ignore
no ip ospf mtu-ignore
Default Configuration
This command has no default configuration.
Command Mode
Interface Configuration (VLAN) mode.
User Guidelines
This command has no user guidelines.
Example
The following example disables OSPF MTU mismatch detection on VLAN
interface 15.
console(config-if-vlan1)#ip ospf mtu-ignore
ip ospf network
Use the ip ospf network command to configure OSPF to treat an interface as
a point-to-point rather than broadcast interface. To return to the default
value, use the no form of this command.
2CSNXXX_SWUM204.book Page 1750 Monday, January 25, 2016 1:25 PM