I have several routers that have a tunnel resource showing up and showing an impossible utilization of over $3900 percent. It has a designation of Tunnel1 - Tu2. What is this and how can I troubleshoot it?
They may be GRE tunnels. If you do a "show IP interface brief", you'll see the list of tunnels. Then if you do a "show interface tunnelxxx" you can see what the bandwidth is being reported. They're probably set to the default value.
these are usually vpn tunnels
all you need to do is set the bandwdth for the tunnel (manually if you need to)
if it is on a spoke then asign the same bandwidth as the link to the spoke
if it is the hub then go with the max ethernet link you have on the device.
I don't think these are vpn tunnels but I don't know for sure. How can I verify that?
You need to examine the interface configs on the device. Look for IPSec and/or VPN configuration.
I tried to login to the interface and I got a message that says % this interface cannot be modified. I did a show config from enable mode and I didn't see interface tu2 anywhere. this is an MPLS router so I doubt there would be any vpns on it. What else could this be?
