There is a very valable book dedicated for BGP4:
Internet Routing Architectures
By Halabi, Bassam; Softcover; 477 Pages
Published by Cisco Press; 04/1997; ISBN: 1562056522
On-line Ordering:
http://www.cbooks.com/sqlnut/SP/search/gtsumt?isbn=1562056522
Ehab Hadi
ehabh@nortel.ca
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