Dell S6000–ON Configuration Manual page 481

Configuring the IS-IS Metric Style
All IS-IS links or interfaces are associated with a cost that is used in the shortest path first (SPF)
calculations. The possible cost varies depending on the metric style supported.
If you configure narrow, transition, or narrow transition metric style, the cost can be a number between 0
and 63. If you configure wide or wide transition metric style, the cost can be a number between 0 and
16,777,215. Dell Networking OS supports five different metric styles: narrow, wide, transition, narrow
transition, and wide transition.
By default, Dell Networking OS generates and receives narrow metric values. Matrixes or costs higher
than 63 are not supported. To accept or generate routes with a higher metric, you must change the
metric style of the IS-IS process. For example, if you configure the metric as narrow, and a link state PDU
(LSP) with wide metrics is received, the route is not installed.
Dell Networking OS supports the following IS-IS metric styles.
Table 44. Metric Styles
Metric Style
narrow
wide
transition
narrow transition
wide transition
To change the IS-IS metric style of the IS-IS process, use the following command.
• Set the metric style for the IS-IS process.
ROUTER ISIS mode
metric-style {narrow [transition] | transition | wide [transition]} [level-1
| level-2]
The default is narrow.
The default is Level 1 and Level 2 (level-1–2)
To view which metric types are generated and received, use the show isis protocol command in
EXEC Privilege mode. The IS-IS matrixes settings are in bold.
Example of Viewing IS-IS Metric Types
Dell#show isis protocol
IS-IS Router: <Null Tag>
Intermediate System to Intermediate System
Characteristics
Sends and accepts narrow or old
TLVs (Type, Length, Value).
Sends and accepts wide or new
TLVs.
Sends both wide (new) and
narrow (old) TLVs.
Sends narrow (old) TLVs and
accepts both narrow (old) and
wide (new) TLVs.
Sends wide (new) TLVs and
accepts both narrow (old) and
wide (new) TLVs.
Cost Range Supported on IS-IS
Interfaces
0 to 63
0 to 16777215
0 to 63
0 to 63
0 to 16777215
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