Question about Etherchannel configuration

[Andy3055]

Hi everyone

Good day to you.

I met two issues when configuring Etherchannel:

1."%EC-5-CANNOT_BUNDLE2: Fa0/6 is not compatible with Po3 and will be suspended (vlan mask is different)"

2."%EC-5-CANNOT_BUNDLE2: Fa0/2 is not compatible with Po1 and will be suspended (native vlan of Fa0/2 is 99, Po1 id 1)"

I will be grateful if you can give me some ideas to solve this.

Best regards

Andy

[balaji.bandi · Accepted solution]

change the native VLAN as suggested to match each other. (make sure VLAN created before making native vlan on the switch if that is not exists)

 (native vlan of Fa0/2 is 99, Po1 id 1)"

still, issue post config of both the switches.

[balaji.bandi]

change the native VLAN as suggested to match each other. (make sure VLAN is created before making native VLAN on the switch if that does not exist)

 (native vlan of Fa0/2 is 99, Po1 id 1)"

still, issue post config of both the switches.

[Martin L]

Massage gives you answers, aka tells you what is wrong: "vlan mask is different" and "native vlan id is different"

All ports belonging to Etherchannel on the same switch must have same settings and configurations. The message tells you fa0/6 does not match to existing ports in Po3 and Fa0/2 does not match ports in Po1.   We usually copy and paste; copy config to notepad, and after changing port ids, pasting into switch. Or you could use interface range command.

Based on your output, you have following mismatch in config:

interface FastEthernet0/2

switchport trunk native vlan 2

switchport trunk allowed vlan 1-2,10

switchport mode trunk

!

interface FastEthernet0/6

switchport trunk native vlan 99

switchport trunk allowed vlan 1-2,5,10

switchport mode trunk

!

as you see vlan 99 does not match vlan 2 and 5 is missing in fa0/2.  Here, I will not be able to bundle fa0/2 and fa0/6 together.  After making configuration of those 2 ports the same, they can be bundle together;  you must look at your config and natch Fa0/6 to existing ports in Po3. and Fa0/2 to ports in PO1. 

Also, remote switch configs matters as well but those are not so strict. 

Regards, ML
**Please Rate All Helpful Responses **

[Joseph W. Doherty]

BTW, one way to avoid Etherchannel member interfaces having different configuration statements, whenever possible, issue configuration statements on the port-channel interface.

Later switch IOSs tend to support more configuration replication from the port-channel interface than they did years ago.

[Andy3055]

Thanks for your ideas, everyone. I've already solved the problems.