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October 27th, 2025 17:44
OS10.6 LACP
We have a pair of S4128T switches that connect our VxRails and their iDRACs. Someone else programmed the switches, and there is no documentation. The open ports all look like this:
interface ethernet1/1/15
description "Servers VLAN 13"
no shutdown
switchport access vlan 13
flowcontrol receive on
I have a Debian 13 server with two NICs, which I am trying to connect to both switches via LACP. They need to be trunked. My understanding is I have to create a port-channel, add the interfaces, and make them active, with the same details on both switches.
Everything looks good on both the server and switches, but there is no connectivity and I cannot ping the gateway. Only when I leave the switch programming as is and the server's NICs unmanaged, can I connect.
Can someone point me in the right direction? It goes without saying that I can't disrupt the VxRails. Thanks
DELL-Erman O
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October 28th, 2025 10:51
Hi,
I would check on switch side below ones.
Create a port-channel and add your two switch ports to it.
Set the port-channel to trunk mode, and allow VLAN 13.
Enable LACP active mode on the physical interfaces.
But i'm not sure debian side. If the switches are not stacked or in a VLT domain, LACP across two switches might be won’t work. In that case, you can use active-backup mode instead of LACP. Make sure VLAN 13 is tagged on the trunk and matches on both ends.
lolcat2
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October 28th, 2025 13:33
I should have mentioned there is a VLT domain. In any event, I tried active-backup and that didn't work, either.
Domain ID : 100
Unit ID : 2
Role : primary
Version : 3.1
Local System MAC address : 50:9a:4c:ee:5b:30
Role priority : 1000
VLT MAC address : 00:00:00:00:00:01
IP address : fda5:74c8:b79e:1::2
Delay-Restore timer : 90 seconds
Peer-Routing : Enabled
Peer-Routing-Timeout timer : 0 seconds
Multicast peer-routing timer : 300 seconds
VLTi Link Status
port-channel1000 : up
VLT Peer Unit ID System MAC Address Status IP Address Version
----------------------------------------------------------------------------------
1 50:9a:4c:ee:5d:30 up fda5:74c8:b79e:1::1 3.1
DELL-Erman O
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October 28th, 2025 13:55
Since you're using VLT, LACP across both switches is supported that’s one of the perks of VLT. Just make sure the basics are in place:
Set the switch ports to trunk mode and ensure VLAN 13 is tagged.
Create a port-channel on both switches using the same ID.
Add the physical interfaces to the port-channel with
channel-group X mode active.On the port-channel itself, set it to trunk and allow VLAN 13.
On the server side, configure bonding mode 802.3ad, then create a VLAN interface on top of the bond. Assign your IP to the VLAN interface not directly to the bond.