D-Link DMS-3130 User Manual - Page 245

DMS-3130 Series Multi-Gigabit L3 Stackable Managed Switch Web UI Reference Guide Parameter Hello Interval Dead Interval Priority Network Type Authentication Password MD5 Key ID MD5 Key Descriptionx Enter the Hello Interval time value here. The range is from 1 to 65535 seconds. The Hello Interval is advertised in the hello packets. Configure the same hellointerval for all routers on a specific network. A shorter Hello Interval ensures faster detection of topological changes but generates more routing traffic and might cause routing instability. Select the Default option to use the default value which is 10 seconds. Enter the Dead Interval time value here. The range is from 1 to 65535 seconds. The Dead Interval is the amount of time that the router waits to receive an OSPF hello packet from the neighbor before declaring the neighbor down. This value is advertised in the router's hello packets. It must be the same for all routers on a specific network. Specifying a smaller Dead Interval ensures faster detection of topology changes, but might cause routing instability. Select the Default option to use the default value which is 40 seconds. Enter the priority value here. The range is from 0 to 255. The OSPF router will determine a Designated Router (DR) for the multi-access network. This sets the priority used to determine the OSPF DR for a network. If two routers attempt to become the DR, the router with the higher router priority will be elected the DR. If the routers have the same priority, the router with the higher router ID takes precedence. Only routers with non-zero router priority values are eligible to become the DR or Backup Designated Router (BDR). Select the Default option to use the default value which is 1. Select the network type here. Options to choose from are: • Broadcast - Specifies the network type as broadcast. • Point-to-Point - Specifies the network type as point-to-point. On a broadcast network, only the DR and BDR become adjacent neighbors of all other routers attached. On point-to-point networks, only two routers become adjacent if they can communicate. Select the authentication type that will be used here. Options to choose from are None, Simple Password, and MD5. After selecting the Simple Password option, enter the simple password here. This password can be up to 8 characters long. The syntax is general string that does not allow spaces. This creates a password (key) that is inserted into the OSPF header when the router originates routing protocol packets. Assign a separate password to each network for different interfaces. Routers on the same network must use the same password to be able to exchange OSPF routing data. Configure the routers in the same routing domain with the same password. Enter the MD5 key ID for the password here. The range is from 1 to 255. Enter the MD5 key here. This key can be up to 16 characters long. The syntax is an alphanumeric string that does not allow spaces. In the MD5 mode, the OSPF message sender will compute a message digest based on the message digest key for the TX message. The message digest and the key ID will be encoded in the packet. The receiver of the packet will verify the digest in the message against the digest computed based on the locally defined message digest key corresponding to the same key ID. The same key ID on the neighboring router should be defined with the same key string. All the neighboring routers on the same interface must use the same key to exchange the OSPF packet with each other. Normally, all neighboring routers on the interface use the same key. With the MD5 digest mode, the user can roll over to a new key without disrupting the current message exchange using the new key. Supposing that a router is currently using an old key to exchange OSPF packets with the 234