Avaya 580 User Manual page 141

Security
To set the IP address used as the source IP address for Access-
Request messages, (configure)# set radius authentication
source-ip <ip-addr>
To set whether the switch recognizes only Access-Accept messages
that have the correct group name included, (configure)# set
radius authentication switch-service-type-required [{enabled |
disabled}]
To set the UDP port number to use for RADIUS authentication,
(configure)# set radius authentication udp-port <1812-or-
1645>
Document No. 10-300077, Issue 2 4-29