You can set up the BIG-IP system to schedule an interval
that sets policy reevaluation and RADIUS re-transmission updates periodically.
On the Main tab, click
The Options screen opens.
In the Policy Options area, specify (in seconds) the Policy Re-evaluation
Interval at which the policy re-evaluation is triggered, to evaluate the
flow policy again.
The re-valuation interval is only for active flows.
For example, a subscriber is provisioned over GX which has a policy to allow
Netflix with some bandwidth. The subscriber is able to watch a movie using the Netflix
service. However, consider that the PCRF installs a policy for this subscriber to block
Netflix over the Gx interface. Then, while the subscriber is viewing the content, the
Netflix content is blocked for the subscriber after the configured re-evaluation
In the RADIUS Options area, for the Re-Transmit Timeout setting,
select Enabled and specify the time in seconds. If you select
Disabled, each RADIUS message is handled as a new message and
this might lead to deletion and creation of sessions even though the radius massage is a
This is the timeout after which the RADIUS message is considered as a new
message, by the BIG-IP system.
The policy and RADIUS updates take effect immediately.