IS-IS - Level of Routing in OSI Networks

3 important questions on IS-IS - Level of Routing in OSI Networks

What does level 0 routing mean?

-Routing between two ES node on the same link
-Routing between an ES node and its nearets IS (intermediate system)

What does level 2 routing mean?

Routing between ES nodes in different areas of a domain

How does IS-IS level 0 discover neighbor ES and IS(gateway) and how much are these sent?

Using hello's send by IS and ES

Neighbor advertisemens are not sent periodically

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