OSPF Configuration Commands 449By default, The MTU value is 0 when the interface sends DD packets, i.e. theactual MTU value of the interface is not written.Database Description (DD) packets are used to describe its own LSDB when therouter running OSPF protocol is synchronizing the database.The default MTU value of DD packet is 0. With this command, the specifiedinterface can be set manually to write the MTU value area in DD packets whensending DD packets, namely, the actual MTU value of the interface is written in.Example# Set interface Vlan-interface 3 to write MTU value field when sending DDpackets.[SW8800] interface Vlan-interface 3[3Com-Vlan-interface3] ospf mtu-enableospf network-type Syntaxospf network-type { broadcast | nbma | p2mp | p2p }undo ospf network-typeViewInterface viewParameterbroadcast: Changes the interface network type to broadcast.nbma: Changes the interface network type to NBMA.p2mp: Changes the interface network type to p2mp.p2p: Changes the interface network type to point-to-point.Note: Due to the media type used on the Switch 8800, Broadcast is the only validoption.DescriptionUse the ospf network-type command to configure the network type of OSPFinterface. Use the undo ospf network-type command to restore the defaultnetwork type of the OSPF interface.■ Broadcast: If Ethernet or FDDI is adopted, OSPF defaults the network type tobroadcast.Related command: ospf dr-priority.ospf timer dead Syntaxospf timer dead { seconds | minimal multi-hello packets }undo ospf timer dead [ minimal multi-hello ]
