Dell#show running-config isis
!
router isis
lsp-refresh-interval 902
net 47.0005.0001.000C.000A.4321.00
net 51.0005.0001.000C.000A.4321.00
Dell#
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 29. Metric Styles
Metric Style Characteristics Cost Range Supported on IS-IS
Interfaces
narrow Sends and accepts narrow or old
TLVs (Type, Length, Value).
0 to 63
wide Sends and accepts wide or new
TLVs.
0 to 16777215
transition Sends both wide (new) and
narrow (old) TLVs.
0 to 63
narrow transition Sends narrow (old) TLVs and
accepts both narrow (old) and
wide (new) TLVs.
0 to 63
wide transition Sends wide (new) TLVs and
accepts both narrow (old) and
wide (new) TLVs.
0 to 16777215
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.
Intermediate System to Intermediate System 499