Reference Guide

520 | Intermediate System to Intermediate System
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IS-IS Metric Styles
The following sections provide additional information on IS-IS Metric Styles.
• IS-IS Metric Styles
• Configure Metric Values
FTOS supports the following IS-IS metric styles:
• narrow (supports only type, length, and value (TLV) up to 63)
• wide (supports TLV up to 16777215)
• transition (supports both narrow and wide and uses a TLV up to 63)
• narrow transition (accepts both narrow and wide and sends only narrow or old-style TLV)
• wide transition (accepts both narrow and wide and sends only wide or new-style TLV)
Configure Metric Values
The following topics are covered in this section:
• Maximum Values in the Routing Table
• Changing the IS-IS Metric Style in One Level Only
• Leaking from One Level to Another
For any level (Level-1, Level-2, or Level-1-2), the value range possible in the
isis metric command in
INTERFACE mode changes depending on the metric style.
Maximum Values in the Routing Table
IS-IS metric styles support different cost ranges for the route. The cost range for the narrow metric style is
0 to 1023, while all other metric styles support a range of 0 to 0xFE000000.
Table 26-4. Correct Value Range for the isis metric Command
Metric Style Correct Value Range for the isis metric Command
wide 0 to 16777215
narrow 0 to 63
wide transition 0 to 16777215
narrow transition 0 to 63
transition 0 to 63