Examples of Maximum Transmission Unit Policies

NetNod

Note that NedNod's policy specifies a 4470-byte MTU, for historic reasons that are no longer applicable today, while PCH's recommendation is a 9000-byte MTU.

"The exchange points consist of two different VLANs on each switch. One VLAN handles standard-sized ethernet frames (MTU <1500 bytes) and one handles Ethernet Jumbo frames with MTU-size 4470 bytes. The VLANs are implemented according to IEEE802.1Q. The VLAN supporting 1500 bytes MTU is VLAN #15 and VLAN for MTU-size 4470 is VLAN #16. The same VLAN-numbers are used at all switches. The ISP has to decide which MTU-size to be used, so as to connect to the correct VLAN. As there is no connection within the exchange points between the different VLANs, an ISP that communicates with parties using different MTU-sizes, MUST have a connection to each VLAN."