Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 
Community Member

Jumbo Frames question

Greetings all!

Question about jumbo frames on a bunch of 3750s we have. I understand that if we want to enable 9000 byte jumbo frames, we need to make sure all 100Mb and 10Mb devices need to be removed from the switches.

What I don't quite understand is: Do we need to actually remove all the 10/100 devices from all the physical switches that are uplinked to each other, or just remove the 10/100 devices on the *vlan* we want to enable jumbo frames on?

i.e. if we have 10 switches, and one of those switches has 2 vlans on (vlan 1 and vlan 2), and the other 9 switches just have vlan 1, would a 10/100 device on vlan 2 mess it up for the rest of the vlan 1 switches?

To rephrase: Do ALL switches on one side of the router need to use jumbo frames, or just certain VLANs?

Thanks for any insight!


Re: Jumbo Frames question

Jumbo frame support can be enabled on the following types of interfaces:

port-channel interface

Switched Virtual Interface (SVI)

physical interface (L2/ Layer 3 (L3))

Hall of Fame Super Bronze

Re: Jumbo Frames question

Jumbo Frames are enabled globally on the Catalyst switch with the system mtu command

and affects all interfaces and Vlans on the switch.

If you decide to enable Jumbo Frames, it's recommended to enable it in all switches as packet may be fragmented when it hits a switch w/o Jumbo Frame enabled.




CreatePlease to create content