D-Link DXS-3610 User Manual - Page 279

DXS-3610 Series Layer 3 Stackable 10GbE Managed Switch Web UI Reference Guide Parameter Network Type Authentication Password MD5 Key ID MD5 Description Select the Default option to use the default value. Select the OSPF network type here. Options to choose from are:  Broadcast - Specifies the network type as broadcast. On a broadcast network, only the designated router and backup designated router become adjacent neighbors of all other routers attached.  Point-to-Point - Specifies the network type as point-to-point. On point-topoint network, 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. After selecting the MD5 option, enter the MD5 key ID for the password here. The range is from 1 to 255. After selecting the MD5 option, enter the MD5 key here. This key must be 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 neighbor router, as the user configures a new key, the router will start the roll over process by sending duplicated packets for both of the old and the new key. The router will stop sending duplicated packets until it finds that all routers on the network have learned the new key. After the rollover process completed, the user should delete the old key to prevent the router from communicating with the router using the old key. Click the Apply button to accept the changes made. 268