10-Gigabit Module and Forwarding Cache

Because of the volume of traffic that the 10-Gigabit module can process and its internal architecture, the module can cause the number of entries in the Layer 3 forwarding cache to reach the default maximum of 130,000 sooner than other modules. Once the maximum is reached:

• The switch routes all new traffic flows by means of the slow path.
• The speed at which traffic is forwarded is decreased.
• The role of master virtual router may be transferred from one VRRP router to another if VRRP is enabled.
• The following message is displayed in the CLI if debug mode is enabled and in the event log if logging of CLI debug messages is enabled:

Log entry <number> by event 2 at <date and time> : Normal(0)

Description: OS Error -- FILE: p2_ipenv.c LINE: 752 Value 0x2 : IP timer got skewed

(Use the logging protocol event cli debug command to enable logging of CLI debug messages.)

This issue is most prevalent when the 10-Gigabit module as well as the rest switch is processing a high volume of layer 3 traffic flows.

To prevent this issue from occurring, monitor the forwarding cache and increase the maximum number of system entries as necessary. You may need to adjust the setting initially to accommodate peaks in network demand.