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Madara Knight said:
Beside the already mentioned, I have TCP/IP protocol suite by Behrouz A. Forouzan, Computer Networking: A top-down approach by Ross Kurose, Data Networks IP and the Internet - Protocols Design and Operation by Martin P. Clark on my reading list. I have these in electronic form and can dig up much more, so if you need any of them - just whistle. In general, I use them as introduction and as maps and later go to more specialized literature, especially ISO standards themselves, which govern the different protocols. As far as BGP is concerned, some of the books, especially Forouzan's, redirects you to more in-depth ones.

P.S. Just found "Live Lessons - Border Gateway Protocol by Jeff Doyle" at backside kicking tors, if you use any of it.
A few more suggestions, about BGP in particular, are contained here:
_http://www.barnesandnoble.com/s/?category_id=649452
_http://www.bgpexpert.com/books.php
 
My days when I had something to do with internet protocols were years ago and my knowledge is outdated and was never very deep anyway. So maybe this is just gibberish.

The internet protocols are standardized in RFC's (Request for Comment), in which you will find the appropriate standards down to bit-level. They are dry to read and sometimes they are not coded/implemented completely/correctly in appropriate equipment.

When checking BGP in Wikipedia, they mention RFC4271, which seem already be outdated:

Updated by: 6286, 6608, 6793 DRAFT STANDARD
Errata Exist
Network Working Group Y. Rekhter, Ed.
Request for Comments: 4271 T. Li, Ed.
Obsoletes: 1771 S. Hares, Ed.
Category: Standards Track January 2006


A Border Gateway Protocol 4 (BGP-4)
...

What is strange: according to Wiki it is used in very large IP networks or between Internet service providers. I would not expect that someone, who gets a service from a provider will not use BGP in his equipment but his provider uses it in their equipment. But without knowledge of your network structure and connections I cannot be sure. When you do not operate appropriate equipment yourself (or have access to it) you may not be able to debug this. You could check the specifications and descriptions you have got for your equipment (router, switch, ...) to see if there is something you could find there.

If possible to connect a PC to the appropriate "place" in the network: There is a network protocol analyzer for Unix and Windows, which is called Wireshark (_https://www.wireshark.org/). It is freeware. With it you can check what is going on on protocol level. You can make traces with it and check if there is something strange.

Good luck, Scottie.
 
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