When IPv4 IS-IS redistributes a route from another route source (such as OSPF, BGP4+, or a static IPv4 route) into IPv4 IS-IS, the route‘s metric value is used as its metric when the metric is not modified by a route map or metric parameter and the default redistribution metric is set to its default value of 0.
The default metric value can be changed.
Note
The implementation of IS-IS does not support the optional metric types Delay, Expense, or Error.