950 CHAPTER 58: OSPF C ONFIGURATIONn A stub router has nothing to do with a stub area.Configuring OSPFAuthenticationBy supporting packet authentication, OSPF receives packets that pass theauthentication only, so failed packets cannot establish neighboring relationship.Follow these steps to configure OSPF authentication:n The authentication mode and password for all interfaces attached to the samearea must be identical.Adding Interface MTUinto DD PacketsGenerally, when an interface sends a DD packet, it adds 0 into the Interface MTUfield of the DD packet rather than the interface MTU.Follow these steps to add the interface MTU into DD packets:Enter OSPF view ospf [ process-id | router-idrouter-id | vpn-instanceinstance-name ] *-Configure the router as a stubrouterstub-router RequiredNot configured by defaultTo do... Use the command... RemarksTo do... Use the command... RemarksEnter system view system-view -Enter OSPF view ospf [ process-id | router-idrouter-id | vpn-instanceinstance-name ] *-Enter area view area area-id -Configure the authenticationmodeauthentication-mode { simple| md5 }RequiredNot configured by defaultExit to OSPF view quit -Exit to system view quit -Enter interface view interface interface-typeinterface-number-Configure the authenticationmode (simple authentication)for the interfaceospf authentication-modesimple [ plain | cipher ]passwordOptionalNot configured by defaultConfigure the authenticationmode (MD5 authentication)for the interfaceospf authentication-mode{ md5 | hmac-md5 } key-id[ plain | cipher ] passwordTo do... Use the command... RemarksEnter system view system-view -Enter interface view interface interface-typeinterface-number-
