CISCO 2811 ETHERNET CONFIGURATION

5 pts.
Tags:
Cisco
Cisco 2811
Network connectivity
Routers
I am using CISCO 2811 router. This CISCO router has a LAN connected via a switch on one side and the ISP via a fibre on the other end. The router looses internet connection periodically, up to seven (7) times every day and this interrupts office work. when I shut down ethernet zero (0) and bring it up again, the internet will still be down and comes up when I power off and then on the router again. what should be the problem with the router or my internet connection?

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It is possible that the ethernet interface is taking errors and going into a shutdown condition. You need to check the configuration of the LAN switch port where this router is connected. Make sure speed & duplex match. Turn on debug logging to get more details around the event. Please post more information when it becomes available.

Also, in addition to the duplex and speed of the Eth0 interface you might check the other interface. While it’s down try pinging the two IP addresses of the router. If you can ping them both then atleast the router is routing traffic and you’ll need to look at the external connection.

It is possible that there is a speed/duplex problem on the internet side of the router, check with your ISP to see what they need the interface configured for because sometimes AUTO configuration doesn’t work properly between different device types.

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