[c-nsp] mtu issues on 3750

[Marko Milivojevic]

Have you tried configuring IP MTU on SVI/L3 interface?

Tassos Chatzithomaoglou wrote:
> 3750 switches are said to support mtu > 1500 (1500-9000) on all GE ports 
> according to this:
> 
> http://www.cisco.com/en/US/products/hw/switches/ps700/products_configuration_example09186a008010edab.shtml#c3
> 
> 3750#sh system mtu
> 
> System MTU size is 1500 bytes
> System Jumbo MTU size is 1600 bytes
> 
> Routed port
> -----------
> 3750#sh int g1/0/10
> GigabitEthernet1/0/10 is up, line protocol is up (connected)
>    MTU 1600 bytes, BW 1000000 Kbit, DLY 10 usec,
> 
> 3750#sh ip int gi1/0/10
> GigabitEthernet1/0/10 is up, line protocol is up
>    MTU is 1500 bytes
> 
> SVI
> ---
> 3750#sh int g1/0/10
> GigabitEthernet1/0/10 is up, line protocol is up (connected)
>    MTU 1600 bytes, BW 1000000 Kbit, DLY 10 usec,
> 
> 3750#sh ip int vlan 99
> Vlan99 is up, line protocol is up
>    MTU is 1500 bytes
> 
> 
> So you can't have L3 mtu > 1546 (= system mtu) if the GE ports are configured as 
> L3 (Routed/SVI) ports. Any idea how to overcome this?
> 
> --
> Tassos
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