Enabling Jumbo MTU in Dell & Cisco Switches

Crazycrux
Crazycrux used Ask the Experts™
on
I have 2 Cisco WS-CBS3130G-S-F & 5 Dell PCM6220s connected a Cisco 6506 switch. the Uplinks are configured as port channels.

Now i want to set the MTU size of these port channels as 9198. Is it advisable to increase the MTU in the port channel alone or to the entire switch.

If i need to implement it for the Po...then should i increase it for Po alone or to the ports that are binded for the Pos.

Also for a Cisco switch how to increase the MTU for one particular interface.

In Dell I am able to loginto the interface and set it, but in Cisco I am not able to.
Comment
Watch Question

Do more with

Expert Office
EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®
TimotiStDatacenter Technician
Top Expert 2012

Commented:
On Cisco, you can do it with the "mtu" command under the interface config:

PD-6509(config)#int gig1/20
PD-6509(config-if)#?
Interface configuration commands:
...
  mtu                 Set the interface Maximum Transmission Unit (MTU)
...

PD-6509(config-if)#mtu ?
  <1500-9216>  MTU size in bytes

Open in new window


This is for layer 2. You can configure L3 MTU with "ip mtu <mtu>".

Tamas

Author

Commented:
Hi Tamas,

Thanks. But it works only the higher end switches like 6500 series not on a chassis switch module (CBS3130G)
TimotiStDatacenter Technician
Top Expert 2012

Commented:

Author

Commented:
Yes "system mtu jumbo" will work on global mode...not on interface mode. (for particular Interface)
Datacenter Technician
Top Expert 2012
Commented:
That's true. It's quite possible that you can't control it on a per-interface basis, only system-wide.

Do more with

Expert Office
Submit tech questions to Ask the Experts™ at any time to receive solutions, advice, and new ideas from leading industry professionals.

Start 7-Day Free Trial