Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - 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 Characteristics Cost Range Supported on IS-IS Interfaces Sends and accepts narrow or old 0 to 63 TLVs (Type, Length, Value). Sends and accepts wide or new TLVs. 0 to 16777215 Sends both wide (new) and narrow 0 to 63 (old) TLVs. Sends narrow (old) TLVs and accepts both narrow (old) and wide (new) TLVs. 0 to 63 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. 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. Intermediate System to Intermediate System 594