[SOLVED] One Server with two NIC's, each in a LACP bond, kills the switch?

[LBX_Blackjack]

Hello,

I am trying to set up our PVE node on the network and am having an issue I've been thus far unsuccessful in resolving.
The node has two NIC's with multiple ports (1-4, and 5-8), which I've set up for LACP resulting in two bonds (bond0, and bond1). The goal is that bond1 (ports 5-8 / the second NIC) will act as a failover for bond0 (ports 1-4 / the first NIC). Everything works fine when only bond0's ports are plugged into our switch, but within a few seconds of plugging in the ports of bond1, the switch becomes unresponsive, the server's fans go full-speed, and PVE says that each port's speed has been set to 0.

I can't figure out what I'm doing wrong. Do I need spanning tree? Do the bonds need to be bonded to each other in round-robin? Please let me know what information I can provide to help diagnose this issue.

 

[Arvyr]

Yes, from what you write this is most likely a spanning-tree issue.
So in that scenario, you want to enable spanning-tree on your bonds and switch.

 

[LBX_Blackjack]

Brilliant! That seems to have done the trick. Thank you very much!

 

[spirit]

It's also possible to do a bond (active-backup) with 2 others bond (lacp)

No spanning-tree, no convergence problem ^_^

 

[Arvyr]

Also an option.
Never tried bundling two bonds into another one though.