Jumbo Frame Support 4500X

[IAIN HILL]

Can anyone give me a definitive answer as to how I enable Jumbo frame support on a 4500x system?

Ive enabled it on the VLAN interface and the physical interfaces dont have the command available in config mode.

Thanks in advance.

Iain

[Iulian Vaideanu]

The "mtu" command should be available in the config mode for the physical interfaces, allowing values up to 9198 (I do have it, on a WS-C4500X-16 running IOS XE 03.04.04.SG)...

[IAIN HILL]

(cat4500e-UNIVERSALK9-M), Version 03.04.02.SG

I dont have the 9198 value only standard MTU values.

[Iulian Vaideanu]

Strange...  it's even given as an example here: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/15-1-2/XE_340/configuration/guide/config/sw_int.html#pgfId-1068699

What does the following attempt look like on your switch?

sw1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
sw1(config)#inte
sw1(config)#interface te1/1
sw1(config-if)#mt
sw1(config-if)#mtu ?
  <1500-9198>  MTU size in bytes

[IAIN HILL]

bad choice of interfaces on my behalf! Its not on the interfaces I looked on as these are the ones in the VSS bundle.

Looked elsewhere and the command is there.

Need to change and test again.

Iain

[Earl Granger IV]

Guys is this a production impacting configuration?