On Tue, 2011-07-12 at 19:46 +0000, Leigh Harrison wrote: > 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 [and they] have a standard system mtu > of 1500. > [...] Sending packets of 1496 bytes over the mpls works just fine, but > when I push 1497, it doesn't work - hence my thoughts of an MTU issue. > > Have we fallen into a silly trap or is there a straightforward > solution? Is this an MTU problem or am I clutching at straws?
It does sound a lot like an MTU issue. Is there any reason why you don't just raise the system MTU on the 3750E switches? It takes a reload to activate but is otherwise quite uncomplicated, "system mtu jumbo 9198" in global-config. -- Peter _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
