Etherchannel on 2 Cisco switches

On the ports you want to put in the etherchannel add this command:

channel-group 1 mode on

Put that command on each port.

That command will create a new interface up at the top of your config.

Interface Port-Channel 1

On this interface you can put your trunking commands etc..

Make sure the config on each of the ports is identical before you do this.

You can issue a show etherchannel detail to verify your configuration.

on each switch you will need to setup channel-groups

int range f0/45 - 48
 channel-group 1 mode on

you will also want to make sure everything is the same on each port (ex, speed, duplex, defalut vlan etc...)

Quick, Do you want do Layer 2 port-ch or L3
here is ex of both type


interface Port-channel2
 description "PORT CHANNEL CONNECTION TO nycrtr01-399-core (port GI3/46-47)"
 no switchport
 ip address 10.10.10.86 255.255.255.252
!
interface GigabitEthernet0/1
 description "Connectiont to rtr01 (gi3/47) "
 no switchport
 no ip address
 channel-group 2 mode active
!
interface GigabitEthernet0/2
 description "Connectiont to rtr01 (gi3/48) "
 no switchport
 no ip address
 channel-group 2 mode active




LAYER - 2

!
interface Port-channel9          
 description "Connection to rtr01 "
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 998
 switchport trunk allowed vlan 20,21
 switchport mode trunk
!
interface FastEthernet0/47
 description "Connection to rtr01"
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 998
 switchport trunk allowed vlan 20,21
 switchport mode trunk
 channel-group 9 mode active
!
interface FastEthernet0/48
 description "Connection to nycrtr04-399-idf-w"
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 998
 switchport trunk allowed vlan 20,21
 switchport mode trunk
 channel-group 9 mode active

What do you mean by port wire speed?

There is a method in which the packets get shot out over the etherchannel.  So for a given connection between two endpoints the traffic will flow over one of the links in the etherchannel.  So that connection will only get 1 gig max.  The next connection to a different destination perhaps starts up and goes over the next link in the etherchannel.  So now that connection can max out at 1 gig, but you have a cumulative of 2 gigs of traffic.  So basically each connection is limited to the physical port speed of the ports that make up the etherchannel.

got it, thanks guys