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Here is a list of possible troubleshooting tips that may solve your problem:
- If you have a serial cable connected to the router, make sure that the router that is acting as the DCE has clockrate configured on its interface.
- You may also want to swap the cable with a cable that you know works. You can also try to bring down the interface and bring it up on both routers.
- Make sure your address information is correct on both interfaces and also make sure not to use a classfull routing protocol.
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