JS> Could it be any problem with AAA procedure?
UDP is anycast-friendly. Your biggest problems are likely to be authentication database replication/synchronization and merging accounting records... i.e., nothing really different from standard RADIUS deployments.
What I met problem to understand is, 1) Is that required to route traffic from a specific BRAS to exact one server if DB behind radius server is syncronized periodically 2) There is two Farm, each has several servers. As number of paths supported by cisco/Juniper router is limited ( <= 8 or 16), we could not mix those server into one farm. is there any way to balance load between two or more farms automatically?
Load balancing is trickier when RADIUS servers and NASes live on the same network segment. You'll need something a la Windows Advanced Server or distributed 802.3ad. I know of no turn-key implementation of the latter;
Do you mean aggregate interfaces of several servers into one 802.3ad trunk? I think even NASes and radius live on the same ethernet, OSPF/IS-IS could establish equal cost paths. thanks Joe __________________________________ Do you Yahoo!? Yahoo! Movies - Search movie info and celeb profiles and photos. http://sg.movies.yahoo.com/