06-24-2010 06:31 AM - edited 03-06-2019 11:44 AM
Having a really hard time here and hopefully someone on this forum can help me get this EtherChannel working. I have two Cisco 3560G 24 port switches. I am using ports 25-28, with SFP modules, between the switches as an EtherChannel. The problem is, all 8 ports have no link lights. All ports in the EtherChannel are down. This is the config that I have already entered:
Config t
Interface range gi0/25-28
switchport trunk encapsulation dot1q
switchport mode trunk
switchport allowed vlan 1,2
channel-group 1 mode on
End
interface Port-channel1
switchport trunk encapsulation dot1q
switchport mode trunk
switchport trunk allowed vlan 1,2
06-24-2010 06:39 AM
On int g0/25 you are missing channel-group number .
ISCSI2#show run int gi0/25
Building configuration...
Current configuration : 158 bytes
!
interface GigabitEthernet0/25
switchport trunk encapsulation dot1q
switchport trunnk allowed vlan 1,2
switchport mode trunk
channel-group mode on
06-24-2010 06:55 AM
That was a typo. It is actually correct on both switches. Each port in the EtherChannel has the same config.
06-24-2010 06:59 AM
Could you post the the config for both switches and the output of this command on both switches
show etherchannel 1 sum
Mike
06-24-2010 07:03 AM
I may just have found the issue. It seems that the configs are not the same! on switch 1 I have put in a switchport access vlan 2 command but not on switch 2. Now the question is, before I remove it, should that command be in there or no? Vlan 2 is our ISCSI vlan which is what these switches are being used for. Do we need to specify switchport access vlan 2?
Thanks guys.
06-24-2010 07:20 AM
Looks like you have these configured as a trunk and you are allowing vlan 1 and 2 on the trunk so you should not need that.
Mike
06-24-2010 07:34 AM
Well, I got it to work by removing the "switchport access vlan 2" command from switch 1. I then issued a shut and no shut on port-channel1. The interfaces came up. Now, what can I do to verify that this config is working? I basically need to prove that vlan 2 is available on both sides. I can certainly ping, but what other commands can I issue?
06-24-2010 07:37 AM
Run the command
show etherchannel 1 sum
on both switches.
Mike
06-24-2010 07:43 AM
Each switch shows the ports as bring in a "P" state. The Port-channel looks like this: Po1 (SU)
06-24-2010 07:53 AM
I am unable to ping across switches.
06-24-2010 08:31 AM
Then the etherchannel is up. Are the switches in vlan 1 or 2?
Mike
06-24-2010 10:14 AM
I figured it out. I had my laptop plugged into the wrong port. It's on vlan 1, not vlan 2. Therefore it is unable to ping across vlans.
Thanks for all your help. Learned alot today!
On a final note, what commands or tools can I use that will "show" that we do indeed have a 4GB trunk across these switches? Any bandwidth commands or tools around?
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