Hi, On Tue, Jul 12, 2011 at 07:46:00PM +0000, Leigh Harrison wrote: > There is a legacy layer 2 network which has had an mpls network > built over it. A link between two of the data centres is a dark > fibre between two Cisco 3750E switches running on the ten gig ports > with a variety of vlans passing over a dot1q trunk. Both of these > switches are pretty much out of the box and have a standard system > mtu of 1500.
You have an MTU problem. If you want to send (1500 byte + extra header
bytes) packets over a link with a MTU of 1500 -> FAIL.
gert
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