Serial Subinterface Packet Tracer Serial 000 Invalid

Tip: If the failing expression is known to be legally refer to something thats sometimes null or missing, either specify a default value like myOptionalVarmyDefault, or use when-present when-missing.

These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)myDefault, (myOptionalVar.foo).

The Cisco 2811 router that Im unable to create a subinterface on has the follwoing IOS flash:c2800nm-advsecurityk9-mz.124-15.T9.bin.

IOS is the problem or Im usign the wrong commands.

Serial Subinterface Packet Tracer Serial 000 Invalid

RTR2(config)inter RTR2(config)interface serial 000 Invalid input detected at marker.

I suspect that the issue is in the approach to configuring the serial subinterface.

It would be helpful is you could post the configuration of the serial interface and the serial subinterface from the router that was supplied to you.

And it would be helpful if you also post the exact commands that you are entering and any response generated from the router when you attempt the configuration of the serial subinterface.

This particular post said, the T1 Controller interface need to be configured and then a serial interface will be created.

Yes there is something else that you need to configure under the T1 controller to create the serial interface.

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