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Simple answer, the jumbo size.<br />
<br />
Explanation:<br />
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VLAN's don't have a MTU a VLAN interface does, ports do, and a etherchannel does.<br />
<br />
A VLAN interface is only used when you are talking directly to the IP address for that VLAN interface.
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Simple answer, the jumbo size.

Explanation:

VLAN's don't have a MTU a VLAN interface does, ports do, and a etherchannel does.

A VLAN interface is only used when you are talking directly to the IP address for that VLAN interface.

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giltjr,<br />
<br />
Thanks for your reply. &nbsp; So if two devices on the same VLAN, but different switches with jumbo frame enabled will also talk using the jumbo size since traffic won't need to be routed out of the vlan? &nbsp;<br />
<br />
Thank you very much again for your time.
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giltjr,

Thanks for your reply.   So if two devices on the same VLAN, but different switches with jumbo frame enabled will also talk using the jumbo size since traffic won't need to be routed out of the vlan?  

Thank you very much again for your time.

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I setup port-channels on the 3560X switch with multiple vlan suport and set Jumbo MTU size to 9198. &nbsp;VLAN mtu is 1500. &nbsp;If two devices with jumbo frame enabled (mtu=9100) are connected to this switch and are on the same VLAN, which mtu size will they be using when talking to each other? &nbsp; Thank you.
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I setup port-channels on the 3560X switch with multiple vlan suport and set Jumbo MTU size to 9198.  VLAN mtu is 1500.  If two devices with jumbo frame enabled (mtu=9100) are connected to this switch and are on the same VLAN, which mtu size will they be using when talking to each other?   Thank you.

Is the VLAN mtu or port mtu that my 3560 switch is actually using?

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.