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Setting MTU on 2501.

I received this out put when I try to adjust the MTU on the ethernet LAN on my 2501 Cisco router,

"LAB_B(config-if)#mtu 18000

% Interface Ethernet0 does not support user settable mtu.

% At least one member of the channel group 0 is not a 2FE port adapter".

Can I get some help understanding what this means and why am I not having the same problem with the serial line, it adjusts fine. I have a lab environment with two 2501 connected back to back with a serial crossover and a LAN coming off each. I have all this going through a 2924 Cisco switch.

Help.

1 REPLY
Bronze

Re: Setting MTU on 2501.

The maximum frame size on ethernet is fixed at 1500. This is just part of the standard and cannot be changed.

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