Dell S4820T, Configuration Manual

Page: 554 / 1178

IS-IS Metric Styles
The following sections provide additional information about the IS-IS metric styles.
• Configuring the IS-IS Metric Style
• Configure Metric Values
Dell Networking OS 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
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.
The following describes the 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
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.
Change the IS-IS Metric Style in One Level Only
By default, the IS-IS metric style is narrow. When you change from one IS-IS metric style to another, the
IS-IS metric value (configured with the
isis metric
command) could be affected.
In the following scenarios, the IS-type is either Level-1 or Level-2 or Level-1-2 and the metric style
changes.
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Intermediate System to Intermediate System