Reference Guide

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.
Table 35. Metric Value When the Metric Style Changes
Beginning Metric Style Final Metric Style Resulting IS-IS Metric Value
wide narrow default value (10) if the original value
is greater than 63. A message is sent
to the console.
wide transition truncated value (the truncated value
appears in the LSP only). The original
isis metric value is displayed in
the show config and show
running-config
commands and
is used if you change back to
transition metric style.
NOTE: A truncated value is a
value that is higher than 63, but
set back to 63 because the higher
value is not supported.
wide narrow transition default value (10) if the original value
is greater than 63. A message is sent
to the console.
wide wide transition original value
narrow wide original value
narrow transition original value
narrow narrow transition original value
narrow wide transition original value
transition wide original value
transition narrow original value
transition narrow original value
transition wide transition original value
narrow transition wide original value
narrow transition narrow original value
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