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GRE tunnel between non-directly connected router and switch
Thanks all for your kind assistance. Between reading the documentation linked by Shawn and going through the configs provided by Dailongli I’ve finally worked it out. GRE tunnels are not officially supported on 3550s but can be made to work. It turns out I was making a stupid mistake - the endpoint 3550 was not running in layer 3 mode (ie. I had not configured “ip routing” on it).
It seems that you can get a GRE tunnel working between a layer 2 mode 3550 and a router provided that you do not turn on keepalives. If you want to use keepalives you need to enable layer 3 mode on the switch.
Ash.
