Dell C1048P Port Extender Networking Command-Line Reference Guide for the C900 - Page 908

Usage Information You can configure priorities independently for Level 1 and Level 2. Priorities determine which router on a LAN is the designated router. Priorities are advertised within hellos. The router with the highest priority becomes the designated intermediate system (DIS). NOTE: Routers with a priority of 0 cannot be a designated router. Setting the priority to 0 lowers the chance of this system becoming the DIS, but does not prevent it. If all the routers have priority 0, one with highest MAC address becomes DIS even though its priority is 0. is-type Configure IS-IS operating level for a router. C9000 Series Syntax is-type {level-1 | level-1-2 | level-2-only} To return to the default values, use the no is-type command. Parameters level-1 level-1-2 level-2-only Allows a router to act as a Level 1 router. Allows a router to act as both a Level 1 and Level 2 router. This setting is the default. Allows a router to act as a Level 2 router. Defaults level-1-2 Command Modes ROUTER ISIS Command History This guide is platform-specific. For command information about other platforms, refer to the relevant Dell Networking OS Command Line Reference Guide. The following is a list of the Dell Networking OS version history for this command. Version 9.9(0.0) 9.5(0.1) 9.0.2.0 8.3.19.0 8.3.12.0 8.3.11.1 Description Introduced on the C9010. Introduced on the Z9500. Introduced on the S6000. Introduced on the S4820T. Introduced on the S4810. Introduced on the Z9000. Usage Information The IS-IS protocol automatically determines area boundaries and are able to keep Level 1 and Level 2 routing separate. Poorly planned use of this feature may cause configuration errors, such as accidental area partitioning. If you are configuring only one area in your network, you do not need to run both Level 1 and Level 2 routing algorithms. You can configure the IS type as Level 1. Intermediate System to Intermediate System (IS-IS) 908