Loading ...Here are the relevant parts of the configuration to setup an etherchannel between an IOS device and a CatOS device. First lets start with the CatOS device, in this case a 6509. We will be using ports 3/9 and 3/10.
We first need to set the ports we want to use to be a trunk. Here we are forcing dot1q.
Now we need to setup the port channels. These channels will be used as 1 and aggregate bandwidth between them.
Note: There is an option at the end of this command to specify the admin group. This is how the CatOS groups the ports. If you do not specify the admin group, the CatOS will automatically assign one. This is something to watch out for if you set each port separately.
Now, turn the port channel on.
That is it for the CatOS. The config for the IOS is quite a bit different. First, create a port channel interface and make it a trunk.
3750(config-if)#switchport trunk encapsulation dot1q
3750(config-if)#switchport mode trunk
Assign ports to the port channel group.
3750(config-if)#channel-group 1 mode on
3750(config-if)#interface GigabitEthernet1/0/2
3750(config-if)#channel-group 1 mode on
Just connect the ports and everything should come up. To check on the CatOS.
Port Status Channel Admin Ch Mode Group Id
—– ———- ——————– —– —–
3/9 connected on 746 1734
3/10 connected on 746 1734
Port Device-ID Port-ID Platform
—– ——————————- ————————- —————-
3/9 3750 GigabitEthernet1/0/1 cisco WS-C3750-48P
3/10 3750 GigabitEthernet1/0/2 cisco WS-C3750-48P
Here, both ports 3/9 and 3/10 show as connected and on the same admin channel.
And for the IOS.
Flags: D - down P - in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
——+————-+———–+———————————————–
1 Po1(SU) - Gi1/0/1(P) Gi2/0/1(P)
The last line is the important one. Notice that is shows both ports are in port channel 1.
To configure and IOS to IOS etherchannel, just repeat the exact steps for the IOS on the second switch.
That’s all there is to it.
You rock, thanks! Was having trouble until I read this, I was missing the command on the 5500 that aggregated the ports into a single channel.