These actually require you to type in whole words and sentences to make them work. It may be our bias, but this style of configuration is our favorite. Routers configured in this way are easy to document, easy to reproduce and simple to modify. All these routers take some getting used to, but we think that network managers who have lots of routers to manage will appreciate the power of a command-line interface. For this reason, we consider it unconfigurable from the command line.
Flexibility is another dimension to the configuration matrix.
We feel that any router you can't ''telnet'' to is flawed, because it severely limits the ability of the network manager to fix problems on the fly. Wellfleet Access Node all need simple remote configuration and don't have it. ACC promised this upgrade would be available soon, but the rest won't be joining it any time soon. We found that not every protocol is implemented in the same way. Most problems in heterogeneous configurations came from defects in the routing protocols.