TP-Link T3700G-28TQ T3700G-28TQ V1 UG - Page 198
Passive Mode, MTU Ignore, Database Filter, Authentication, State
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Passive Mode: MTU Ignore: Database Filter: Authentication Type: Authentication Key ID: Authentication Key: State: Make an interface passive to prevent OSPF from forming an adjacency on an interface. OSPF advertises networks attached to passive interfaces as stub networks. Interfaces are not passive by default. Disables OSPF MTU mismatch detection on received database description packets. Default value is Disable (MTU mismatch detection is enabled). To prevent outgoing link-state advertisements (LSAs) flooding out of an OSPF interface. The default is Disable, all outgoing LSAs are flooded out of the interface. Displays the authentication type of the interface. One of the following: default: The authentication type is same with the associated area's authentication type. null: No authentication. simple: Use simple password. md5: Use md5 message-digest algorithm. Displays the active authentication key ID of the interface. Displays the active authentication key of the interface. Displays the current state of the selected router interface. One of the following: Down: This is the initial interface state. In this state, the lower-level protocols have indicated that the interface is unusable. In this state, interface parameters will be set to their initial values. All interface timers will be disabled, and there will be no adjacencies associated with the interface. Loopback: In this state, the router's interface to the network is looped back either in hardware or software. The interface is unavailable for regular data traffic. However, it may still be desirable to gain information on the quality of this interface, either through sending ICMP pings to the interface or through something like a bit error test. For this reason, IP packets may still be addressed to an interface in Loopback state. To facilitate this, such interfaces are advertised in router- LSAs as single host routes, whose destination is the interface IP address. Waiting: The router is trying to determine the identity of the (Backup) Designated Router by monitoring received Hello Packets. The router is not allowed to elect a Backup Designated Router or a Designated Router until it transitions out of Waiting state. This prevents unnecessary changes of (Backup) Designated Router. DR: This router is itself the Designated Router on the attached network. Adjacencies are established to all other routers attached to the network. The router must also originate a Network LSA for the network node. The Network LSA will contain links to all routers (including the Designated Router itself) attached to the network. BDR: This router is itself the Backup Designated Router on the attached network. It will be promoted to Designated Router if the present Designated Router fails. 187