ExtremeXOS supports IP fragmentation within a VLAN (Virtual LAN). This feature does not require you to configure the MTU size.
If you leave the MTU size configured to the default value, when you enable jumbo frame support on a port on the VLAN you will receive a warning that the ip-mtu size for the VLAN is not set at maximum jumbo frame size. You can ignore this warning if you want IP fragmentation within the VLAN, only. However, if you do not use jumbo frames, IP fragmentation can be used only for traffic that stays within the same VLAN. For traffic that is sent to other VLANs, to use IP fragmentation, all ports in the VLAN must be configured for jumbo frame support.
Note
IP fragmentation within a VLAN does not apply to Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X870, X690 series switches (whether or not included in a SummitStack). The platforms that currently support fragmentation do so only for Layer 3 forwarding.
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