12-15-2025 09:56 AM
I'm trying to connect a Trunk port using fiber from a 3850 switch to a server using fiber. the following is how i configured the port and the port-channel group:
description ntnx 1-3
switchport trunk allowed vlan xx
switchport mode trunk
switchport trunk native vlan xx
switchport nonegotiate
channel-group xx mode on
int port-channelxx
description ntnx 1-3
swithchport trunk allowed vlan xx
swithchport mode trunk
switchport trunk native vlan xx
storm-storm-control broadcast level 80.00
storm-control multicast level 80.00
the fiber port is showing suspended and i do the shut no shut commands and nothing happens.
not sure what i did wrong
12-15-2025 10:59 AM - edited 12-15-2025 11:14 AM
Hi @john-birkett,
It is probably because there is a mismatch in configuration between the physical interface(s) and the port-channel (etherchannel) interface. The configuration of both needs to align. Would you please be able to post the full output of 'show run' for the physical interface(s) and the logical port-channel interface?
If you were to issue 'show etherchannel detail' it should show a reason amongst the output on the line "Probable reason"
If there is a misconfiguration in the running-config I would suggest adding the configuration of storm-control to the physical interfaces, or remove storm-control from the port-channel, how ever you desire.
Hope that helps.
12-15-2025 11:27 AM
it doesnt show that.
12-15-2025 11:31 AM - edited 12-15-2025 11:37 AM
Would you please be able to post the full output of 'show run' for the physical interface(s) and the logical port-channel interface, as well as a 'show etherchannel detail'. Also, can I ask what version of IOS-XE version the 3850 is running?
12-15-2025 09:42 PM
Hello @john-birkett
On server side, is it LACP 802.3ad configured ?
"mode on" mean forced Etherchannel with no negotiation. That only works if both sides are statically bundling the links and sending frames exactly as expected...
If server is in LACP, do channel-group xx mode active
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide