Configuring the IS-IS Metric StyleAll IS-IS links or interfaces are associated with a cost that is used in the shortest path first (SPF) calculations. The possible cost variesdepending 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 orwide 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. Toaccept or generate routes with a higher metric, you must change the metric style of the IS-IS process. For example, if you configure themetric 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 45. Metric StylesMetric Style Characteristics Cost Range Supported on IS-IS Interfacesnarrow Sends and accepts narrow or old TLVs(Type, Length, Value).0 to 63wide Sends and accepts wide or new TLVs. 0 to 16777215transition Sends both wide (new) and narrow (old)TLVs.0 to 63narrow transition Sends narrow (old) TLVs and accepts bothnarrow (old) and wide (new) TLVs.0 to 63wide transition Sends wide (new) TLVs and accepts bothnarrow (old) and wide (new) TLVs.0 to 16777215To 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 modemetric-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-ISmatrixes settings are in bold.Example of Viewing IS-IS Metric TypesDell#show isis protocolIS-IS Router: Tag>System Id: EEEE.EEEE.EEEE IS-Type: level-1-2Manual area address(es):47.0004.004d.0001Routing for area address(es):21.2223.2425.2627.2829.3031.323347.0004.004d.0001Interfaces supported by IS-IS:Vlan 2TenGigabitEthernet 4/22Loopback 0Redistributing:490 Intermediate System to Intermediate System
