Opening the book…
Ethernet bridges always have the option of fallback-to-flooding for unknown destinations, so they can afford to build their forwarding tables “incrementally”, putting a host into the forwarding table only when that host is first seen as a sender. For IP, there is no fallback delivery mechanism: forwarding tables must be built before delivery can succeed. While manual table construction is possible, it is not practical.
This page titled 9: Routing-Update Algorithms was last modified on Tue, 01 Dec 2020 03:48:14 GMT and is shared under a CC BY-NC-ND 4.0 license and was authored, remixed, and/or curated by Peter Lars Dordal.
The book could not be loaded just now.