Dell C9000 Series Networking Configuration Manual page 594

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.
The system supports five different metric styles: narrow, wide, transition, narrow transition, and wide
transition.
By default, the system 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.
The system supports the following IS-IS metric styles.
Table 40. 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.
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.
Intermediate System to Intermediate System
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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