Internet Routing Architectures
by
Bassam Halabi, Sam Halabi, Danny McPherson
Description: Internet Routing Architectures covers the functions and applications of BGP-4, focusing on interdomain routing through practical scenarios and configuration examples. The book provides detailed insights into routing protocol design and implementation
ISBN: 157870233X
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As far as BGP goes, Halabi's _Internet Routing Architectures_ [0] is pretty much considered the "bible". It's really old nowadays but it covers BGP4 (the current version in use) and not much has really changed.
I'm sure some of the newer BGP books are excellent as well but I can't personally recommend them as IRA and the (old) CCNP BGP book are all I've ever read/used (while preparing for the CCNP certification and in my day job).
Of course, pretty much everything is covered in RFC 4271 [1] (and updates) although the RFCs can be a bit "dry".
[0]: https://www.amazon.com/dp/157870233X
[1]: https://tools.ietf.org/html/rfc4271