3Com 5500G-EI Command Reference Guide - Page 180

180 CHAPTER 6: USING ROUTING PROTOCOL COMMANDS Use the undo authentication-mode command to cancel the authentication mode for this area. By default, an area does not support an authentication mode. All the routers in one area must use the same authentication mode (no authentication, simple text authentication or MD5 cipher text authentication). In addition, all routers on the same segment must use the same authentication key. To configure a simple text authentication key, use the ospf authentication-mode simple command. To configure an MD5 cipher text key, use the ospf authentication-mode md5 command. Related command: ospf authentication-mode. Example To set the OSPF area 0 to support MD5 cipher text authentication, enter the following: system-view System View: return to User View with Ctrl+Z. [SW5500]router id 1.1.1.1 [SW5500]ospf [SW5500-ospf-1]area 0 [SW5500-ospf-1-area-0.0.0.0]authentication-mode md5 default cost Syntax default cost value undo default cost View OSPF View Parameter value Enter the default routing cost of the external route imported by OSPF, in the range 0 to 16777214. By default, its value is 1. Description Use the default cost command to configure the default routing cost of an external route imported by OSPF. Use the undo default cost command to restore the default value of the default routing cost configured for OSPF to import external routes. Since OSPF can import external routing information, whose routing cost can influence routing selection and calculation, and propagate it to the entire autonomous system, it is necessary to specify the default routing cost for the protocol to import external routes.