Before I start just wanted to say that this is a great forum! Most useful I have found to date for Cisco!
I have a quick question regarding PortChannels and trunking.
In our environment I have several access layer switches that connect to the core switch (stack of four 3750's) using PortChannels.
Typically if I use a 3560 as an example, we have four interfaces combined into a PortChannel to give us 4Gbps from the switch to the core. I have reviewed the configuration and have found inconsistencies in the configuration of the PortChannels. On some port channels the command 'switchport mode trunk' is defined, whilst on others this is not the case? The four interfaces that make up the channel also have this defined (as you would expecext). What issues would arise from / from not having this defined on the PortChannel (please see below for an example)
SW001#sh run int po7
Current configuration : 96 bytes
description TRUNK TO SW003
flowcontrol receive on
SW003#sh run int po1
Current configuration : 92 bytes
switchport trunk encapsulation dot1q
switchport mode trunk
What should I have defined in the channel configuration? I have standardised most of the interfaces so they read like below
When you configure the "channel-group 1 mode active" command for the first time on any interface, the IOS will create the Port-channel 1 (Po1) interface with the same configuration as the physical interface.
When you add subsequent links to the port-channel, make sure these have the same configs as the first link and the Port-channel interface.
Otherwise you will get inconsistency errors.
You should configure the respective configurations on the other side of the channel, of course, so the channel can be negotiated.
So given that on my stack for this I already have a portchannel 'PortChannel 6', I should first of all ensure that the interfaces G x/x are configured correctly with the channel protocol, speed, etc
I should then remove the PortChannel 6 and then add it again?
Im a bit confused as to what the next step is?
What I was hoping was that I could first of all define the interfaces consistently that make up the channel and then configure the portchannel (in this case Portchannel 6) without having to recreate it again?
In doing this I was unsure about what configuration I should apply to the port channel given that the four ports that will make up the channel have been configured correctly using LACP, etc.
I guess what I am asking is how should I define the configuration of the port channel? Should I enable trunking, encapsulation, etc? I appreciate I need to confirm the interface configuration at both ends to ensure that there is consistency I just want to confirm what I need to have enabled on the port channel. As it is the current port channel has trunking enabled, 802.1q encapsulation and that is it!
On the Port-channel interface it isn't necessary to specify these commands. IOS will configure the Port-channel interface automatically, as soon as the commands are consistent on all interfaces that make up the channel group.
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