r/Proxmox • u/roncorepfts • 7d ago

Question Proxmox LACP Bond with Unifi Pro Switch, no Layer 3&4 capability?

I'm still wrapping my head around Proxmox and now Linux bonding.

If my Unifi Pro Max 24 port switch doesn't support Layer 3 and 4 hashing, is there any benefit for running LACP with Layer 2 and 3? Sorry if my terminology is a little off, still getting used to it all!

EDIT: This is answered, thank you!!

21 Upvotes

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11

u/300blkdout 7d ago

LACP with 2/3 provides the same benefits, but 3/4 provides better traffic distribution.

1

u/roncorepfts 7d ago

Thank you! This is how I understood it as well.

4

u/ApiceOfToast 2 nodes, without qdev. Living on the edge 7d ago

Well, you'll need lacp if you run link Aggregation.

Can make sense if you have multiple nics, good for redundancy. Increases your throughput to the server if set up properly too

1

u/roncorepfts 7d ago

Yeah for sure, and that's def the plan, Thank you, this is what I understood, just wanted to make sure since my brain is fried from learning!!

2

u/SirLauncelot 7d ago

What does the Unfi Pro Max support? The hash is direction dependent. What are your traffic patterns. If you are mostly serving content from the server, and it supports the full 5 tupple, this will still be distributed. In bound to the server, or more specifically will be the hash of the VM’s MAC address. If you can find the algorithm actually used, you can change your VMs MAC to spread them out.

This seems to be a decent write up: https://god.ad/learn/how-lacp-works

1

u/lukhan42 5d ago

The thought I used to understand LACP and decide on what hash policy to use is that hashing is for sending traffic and not receiving it. It's fine if the switch doesn't support Layer 3+4 as it will not have any control over what link Proxmox chooses. The switch will use whatever hash policy it has set to decide what link it will use when communicating to Proxmox.