4 good questions and answers about "IS-IS - Configuring IS-IS"

What is the command to configure IS-IS for/on a interface?
interface serial 0/0
ip router isis  routing process tag
What is the interface command for only sending L1 or L2 packets over it?
serial 0/0
isis circuit-type level-1

serial 0/0
isis circuit-type level-2-only
What is the router isis comand to configure wide style metric for IS-IS?
router isis
metric-style wide
What is the behaviour for the IS-IS passive-interface default command?
All local interfaces' networks will be advertised in IS-IS
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