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Enable/Disable Packing

When Xpress packing is enabled, multiple packets are combined into a single super packet before being sent through the Xpress tunnel. Since fewer packets are sent, packing saves on overhead introduced by packet headers. Note that packing is a feature of the Xpress compression key.

Note: To perform this task from PolicyCenter, you must first select a configuration from the Editing Configuration drop-down list at the top of the page.

To enable/disable packing:

1. Click the xpress tab. The current global settings are displayed next to the global tunnel settings button.

2. Click global tunnel settings. The Edit Global Tunnel Settings window appears. show screen

3. For Packing, select on to enable or off to disable.

4. Configure your global tunnel options.

5. Click OK.

Notes:

This procedure applies to enhanced tunnels only. For enabling/disabling packing on legacy tunnels, see Configure Legacy Tunnel Settings.
The maximum size of the super packet is determined by the MTU. See Configure Global Xpress Settings.
In addition to turning packing on globally, you can enable/disable packing on a per-tunnel, per-service, and a per-class basis. See Modify Settings of Static Tunnels, tunnel class set packing and tunnel service set packing.
Because different types of traffic can tolerate different amounts of latency, controls are available to fine-tune the length of time the super packet is held to wait for additional packets to be packed into it. See tunnel class set holdtime and tunnel service set holdtime .
Due to the inherent delay in the process of combining packets, packing will increase network latency. On very busy links, packing doesn't cause much latency because the packets are bundled and sent off quickly. On less active links, Xpress may have to wait to get enough packets in a bundle, possibly creating application performance problems. If you are experiencing latency, try lowering the packing hold time or disabling packing altogether.
Packing is most efficient and effective when dealing with small packets or packets that can be reduced in size with compression.