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.