To resolve this issue, configure the system clocking correctly.
The clocking configuration differs depending on the platform, as shown in these examples:
* For the Cisco 7200VXR series router, issue the frame-clock-select command.
* For the Cisco 2600 or 3700 series routers with an Advanced Integration Module (AIM), perform these steps:
1. Issue the clock source line command under the appropriate controller.
For the Voice and WAN Interface Card (VWIC) controller configuration, the default for the clock source command is clock source line. However, the recovered clock is not used to drive the AIM. Therefore, this configuration is not sufficient to resolve the clock slip problem.
2. To allow the router to recover the clock from the E1 and T1 VWIC and pass it across the backplane to the AIM, issue the network-clock-participate command in global configuration mode.
If multiple VWICS are installed, the command must be appropriately repeated.
3. To allow the AIMs in a Cisco 3700 or 2691 series router to participate in system clocking, issue the network-clock-participate command for each AIM.
4. Specify the network clock source and priority. Issue the network-clock-select command in global configuration mode.
