Is a 3 ports LAG possible?

[bearm]

@giannici


I skimmed down through this thread, so apologies if I've missed details. ;-)

Many vendors and products generally recommend to LAG ports in multiples of two given the hashing algorithm used for load balancing. Chances are the third LAG member will not have much traffic distributed across it.

One absolute requirement though is the LAG members must be of the same speed.

Hope that helps.

[wtm]

We have had problems with LAGS between Mikrotik routers and Netonix switches. Seems that the Netonix will not do 802.3ad Lag after the 1.5.1 firmware IF you are running more than 2 Lags.

We did a bunch of tests, and the ONLY thing that does seem to work is setting up the Mikrotik as "Balanced rr" Lag. We are running 4 Lags on one circuit, and it is running fine now. We have upgraded the firmware to 1.5.5 and all seems to work.

But I do wish that they would look into the 802.3ad standard connection and see WHY it does not work after 2 lags are used.

[Stephen]

I've taken note in my list to look into this.

[mcnnetops]

So, I am going to try to LAG with 1.5.8 an SFP port and say ethernet port 6.

I need to confirm that this works as I have some set up and when going through the SFP port (Such as ethernet port off / disabled) MTU is not the same / does not work.

I will try and get some specifics - but I think that this may be a problem.

[mike99]

MTU should be the same on all port with LAG.

[mcnnetops]

Have not had time to do this - but still on the agenda.

Let me rephrase the MTU thing too:

When using one of the SFP ports in a lag with a regular ethernet port the ability to pass the same size MTU through the ethernet port does not seem to be the same as passing through the SFP port.
IE ping tests with the dont fragment flag set seem to fragment at 1450 on SFP and at 1500 on ethernet.
I am using OSPF, MPLS, VLAN and such, so I know that adds some on top - set MTU on Netonix to 1580....

It seems that only one of the LAG ports is active at a time:
When in this config:
WS-8-150-DC:
LAG ports:
SFP (Port 9)
Eth 4
LAG Type: Static
Destination MAC = disabled
Source MAC = disabled
Source/ Destination IP = enabled
Source / Destination Port = disabled

OTHER END:
Mikrotik RB4011
LAG ports:
Eth1
SFP+ port
Mode : 802.3ad

All ports set to 1G full duplex
MTU on all ports = 1580 (Netonix and Mikrotik)

More to come, as I have talked to someone and they suggested that I set the Netonix to LACP-A - In some short testing this seemed to help.

Again, I will test more thoroughly and report my findings....

[mcnnetops]

Well that is the case - LACP-A seemed to be the way to go for me -

I did not get to testing this out as much as I wanted - but LACP-A worked and worked well for me.