tailieunhanh - The Complete IS-IS Routing Protocol- Part 9

The Complete IS-IS Routing Protocol- P9: IS-IS has always been my favourite Interior Gateway Protocol. Its elegant simplicity, its well-structured data formats, its flexibility and easy extensibility are all appealing – IS-IS epitomizes link-state routing. Whether for this reason or others, IS-IS is the IGP of choice in some of the world’s largest networks. | Juniper Networks JUNOS CLI 67 The counterpart of set is the delete command. As the name implies it is used to delete a certain flag from the configuration. For instance to remove the checksumming flag from interface so-3 0 then the command would be delete interface so-3 0 checksum edit protocols isis hannes@Frankfurt delete interface so-3 0 checksum edit protocols isis hannes@Frankfurt show edit protocols isis hannes@Frankfurt A very convenient use of the delete command is that you can specify both individual elements and even entire branches folders for deletion. For instance if you have a rich set of parameters configured under the protocols isis level 2 branch and you do not want to delete the elements one by one you can delete the entire level 2 configuration by issuing a delete level 2 command. edit protocols isis hannes@Frankfurt show . level 2 authentication-key 9 f5z69CuIEy36cl SECRET-DATA authentication-type md5 SECRET-DATA no-hello-authentication wide-metrics-only preference 100 . edit protocols isis hannes@Frankfurt delete level 2 edit protocols isis hannes@Frankfurt show edit protocols isis hannes@Frankfurt As with file systems in the UNIX world you can access a configuration from any context - all you have to do is specifying the full path in the configuration hierarchy. Therefore you can turn on checksumming from the protocols isis hierarchy level edit protocols isis hannes@Frankfurt set interface so-3 0 checksum edit protocols isis hannes@Frankfurt But this can also be done from the top-level hierarchy note the longer path in the command 68 3. Introduction to the IOS and JUNOS Command Line Interface edit hannes@Frankfurt set protocols isis interface so-3 0 checksum edit hannes@Frankfurt Unlike IOS when you enter the set and delete commands your JUNOS configuration does not become active immediately. You can modify the configuration file as much and as often as you like even deleting it fully and starting from scratch not often a .