Specifications

Chapter 4: Configuring the High-Level Network
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packet for one of the different types of SIP final messages. A default
timeout value exists, which is usually 32 seconds. This timeout value is
the window of time that a stateful proxy maintains state. If you change
the timeout value, we recommend that the value be no lower than the
default.
To activate SIP Call-ID persistence, you can use either the Configuration
utility or the bigpipe pool command.
To activate SIP persistence using the Configuration utility
1. Start the Configuration utility.
2. In the Navigation pane, click Pools.
The Pools screen opens.
3. Select a pool name.
4. Click the Persistence tab.
5. Click the button for SIP persistence.
6. Click the Apply button.
To activate SIP persistence from the command line
Use the following syntax to activate SIP Call-ID persistence from the
command line.
bigpipe pool <pool name> { persist_mode sip [sip_timeout <timeout>] }
To display the contents of the hash table
To display the contents of the SIP persistence hash table, use the bigpipe
command as follows:
bigpipe sip dump
Destination address affinity (sticky persistence)
You can optimize your proxy server array with destination address affinity
(also called sticky persistence). Destination address affinity directs requests
for a certain destination IP address to the same proxy server, regardless of
which client the request comes from.
This enhancement provides the most benefits when load balancing caching
proxy servers. A caching proxy server intercepts web requests and returns a
cached web page if it is available. In order to improve the efficiency of the
cache on these proxies, it is necessary to send similar requests to the same
proxy server repeatedly. Destination address affinity can be used to cache a
given web page on one proxy server instead of on every proxy server in an
array. This saves the other proxies from having to duplicate the web page in
their cache, wasting memory.