Symptom
ISR 3945 reports packets are being transmitted with a size that exceeds interface MTU. Eg:
%LINK-4-TOOBIG: Interface GiX/X, Output packet size of 2132 bytes too big
Conditions
Interface MTU is set to a standard 1500 byte size. Interface has x connects configured and is handling L2TPv3-encapsulated traffic. It seems when the packet is decapsulated, the size is suddenly larger than it had been when it entered the tunnel on the peer router. May be a calculation error.
