Network technologies and trends

Jan 22 2011   12:42PM GMT

Trunking encapsulation mismatch was the problem



Posted by: Yasir Irfan
Tags:
%EC-SP-5-CANNOT_BUNDLE2:
dynamic trunking
no switchport trunk encapsulation dot1q
port-channel
port-channel between Cisco 6500 Series and Cisco 3750 E Series switches
switchport trunk encapsulation dot1q
Te1/7 is not compatible with Te2/7 and will be suspended
Te2/7 is trunk
tenGigabitEthernet
trunk mode of Te1/7 is dynamic
trunking encapsulation mismatch
Trunking encapsulation mismatch was the problem

“Jan 22 09:09:33: %EC-SP-5-CANNOT_BUNDLE2: Te1/7 is not compatible with Te2/7 and will be suspended (trunk mode of Te1/7 is dynamic, Te2/7 is trunk)”

If you see the above error especially while creating a port-channel between Cisco 6500 Series and Cisco 3750 E Series switches don’t panic. You will see the error when there is a trunking encapsulation mismatch for the interfaces associated with the port-channel. When we changed the trunk settings in the both interfaces the problem was solved and port-channel was established.

When the following error occurred

“Jan 22 09:09:33: %EC-SP-5-CANNOT_BUNDLE2: Te1/7 is not compatible with Te2/7 and will be suspended (trunk mode of Te1/7 is dynamic, Te2/7 is trunk)”

The tenGigabitEthernet 1/7 was configured with switchport trunk encapsulation dot1q. When we removed the command with “no switchport trunk encapsulation dot1q” the problem was solved.

Basically the issue was one link was configured for dynamic trunking and other was a trunk a port without any negotiation enabled.

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