HP FlexNetwork 10500 Series Security Configuration Manual page 52

Step
3. Specify the source IP
address of outgoing
HWTACACS packets.
Setting HWTACACS timers
The device uses the following timers to control communication with an HWTACACS server:
•
Server response timeout timer (response-timeout)—Defines the HWTACACS server
response timeout timer. The device starts this timer immediately after an HWTACACS
authentication, authorization, or accounting request is sent. If the device does not receive a
response from the server within the timer, it sets the server to blocked. Then, the device sends
the request to another HWTACACS server.
•
Realtime accounting timer (realtime-accounting)—Defines the interval at which the device
sends realtime accounting packets to the HWTACACS accounting server for online users.
•
Server quiet timer (quiet)—Defines the duration to keep an unreachable server in blocked
state. If a server is not reachable, the device changes the server status to blocked, starts this
timer for the server, and tries to communicate with another server in active state. After the
server quiet timer expires, the device changes the status of the server back to active.
The server quiet timer setting affects the status of HWTACACS servers. If the scheme includes one
primary HWTACACS server and multiple secondary HWTACACS servers, the device communicates
with the HWTACACS servers based on the following rules:
•
When the primary server is in active state, the device communicates with the primary server.
•
If the primary server fails, the device performs the following operations:
Changes the server status to blocked.
Starts a quiet timer for the server.
Tries to communicate with a secondary server in active state that has the highest priority.
•
If the secondary server is unreachable, the device performs the following operations:
Changes the server status to blocked.
Starts a quiet timer for the server.
Tries to communicate with the next secondary server in active state that has the highest
priority.
•
The search process continues until the device finds an available secondary server or has
checked all secondary servers in active state. If no server is available, the device considers the
authentication, authorization, or accounting attempt a failure.
•
When the quiet timer of a server expires, the status of the server changes back to active. The
device does not check the server again during the authentication, authorization, or accounting
process.
•
When you remove a server in use, communication with the server times out. The device looks
for a server in active state by first checking the primary server, and then checking secondary
servers in the order they are configured.
•
When all servers are in blocked state, the device only tries to communicate with the primary
server.
•
When one or more servers are in active state, the device tries to communicate with these
servers only, even if they are unavailable.
•
When an HWTACACS server's status changes automatically, the device changes this server's
status accordingly in all HWTACACS schemes in which this server is specified.
Command
nas-ip { ipv4-address | ipv6
ipv6-address }
38
Remarks
By default, the source IP address
specified by the hwtacacs nas-ip
command in system view is used.
If the source IP address is not
specified, the IP address of the
outbound interface is used.