Preserving incoming fragment characteristics

You can enable this feature to diminish the likelihood of packet fragmentation in the downstream data path. When device receives packet fragments, it must reassemble them into the whole datagram for application layer inspection. Before the datagram is transmitted, it must be broken down again into fragments. If this feature is enabled, the device takes into account the characteristics of incoming fragments when setting the egress interface maximum transmission unit (MTU) size. It identifies the maximum fragment size of all incoming fragments. It uses that information in conjunction with the existing MTU of the egress interface. Device compares the two numbers. It takes the smaller number and uses it for the egress interface MTU size.