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Enabling Jumbo MTU in Dell & Cisco Switches

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.

TimotiSt

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

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

Tamas

Crazycrux

ASKER

Hi Tamas,

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

TimotiSt

On the 3130, use "system mtu jumbo":

http://www.cisco.com/en/US/docs/switches/blades/3130/software/release/12.2_40_ex/configuration/guide/swint.html#wp1154596

Crazycrux

ASKER

Yes "system mtu jumbo" will work on global mode...not on interface mode. (for particular Interface)

ASKER CERTIFIED SOLUTION

TimotiSt