I have a 3750 connected to 2821.3750 has two ports configured as ether channel as trunk.On 2821 i want to configure 2 fast Ethernets in L3 ether channel. When i give command "ether-channel 1 mode on", it only takes "ether-channel 1" as a result when i do "show int fasteth 0/0 ether-channel" it says that ether-channel is disabled.
On which IOS is it supported ?
I want to use trunk ether channel on switch side and L3 ether channel on router side with sub interfaces on the port channel, as my switch will have different VLANS, with the port-channel sub interfaces in the respective vlans?
any help in configuration ?