Service Manual

Version Description
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.5(0.1) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.12.0 Introduced on the S4810.
8.3.11.1 Introduced on the Z9000.
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.
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 Allows a router to act as a Level 1 router.
level-1-2 Allows a router to act as both a Level 1 and Level 2 router. This setting is the
default.
level-2-only 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, see the relevant Dell
Networking OS Command Line Reference Guide.
Version Description
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.5(0.1) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.12.0 Introduced on the S4810.
8.3.11.1 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.
814 Intermediate System to Intermediate System (IS-IS)