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Posts: 1
Registered: ‎02-03-2018

LGS308 LACP/LAGing with a Synology 1515+

Hi I bought a LGS308 as it stated Link Aggregation support in a hope to get a bit more network performance out of my NAS. I believe I had set both ends up correctly. I set up an aggregation of 3 ports to the Synology and 3 ports to my iMac with the builtin ethernet and 2 thunderbolt Ethernet adapters. On port 8 it runs out to a TP-Link 4300 Router which is bridging to a Synology AC1900 Router over 5GHz A/N The Link Aggregation screen shows the following:

PortPort TypeStatusAuto NegotiationPort SpeedDuplex ModeProtected PortLAG
GE11000M-copperUpEnable1000MFullUnprotected 
GE21000M-copperUpEnable1000MFullUnprotected1
GE31000M-copperUpEnable1000MFullUnprotected1
GE41000M-copperUpEnable1000MFullUnprotected1
GE51000M-copperUpEnable1000MFullUnprotected2
GE61000M-copperUpEnable1000MFullUnprotected2
GE71000M-copperUpEnable1000MFullUnprotected2
GE81000M-copperUpEnable1000MFullUnprotected 

 

And the LAG screen shows the following:

LAGLAG TypeOperational StatusActive Port MembersStandby Port MembersLACPOperationalLAG SpeedOperational Flow ControlProtected LAG
LAG 1eth1000MUpGE2, GE3, GE4 Enabled1000MOnProtected
LAG 2eth1000MUpGE5, GE6, GE7 Enabled1000MOnProtected
LAG 3       Unprotected
LAG 4       Unprotected

 

I would have expected to see the Operational Flow Control to be 3000M? Is there something that I am missing with this setup?

Expert
Posts: 14,287
Registered: ‎01-18-2013

Re: LGS308 LACP/LAGing with a Synology 1515+

I think you are missing how a LAG functions under LACP.

 

Example: If you have 3 gigabit ports in a LAG you get a Load Balanced total of 3 gigabit throughput but any single connection will get 1 gigabit.

 


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Expert
Posts: 14,287
Registered: ‎01-18-2013

Re: LGS308 LACP/LAGing with a Synology 1515+

I think you could test by starting 3 different downloads from the Synology at the same time from the iMac.


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Posts: 10
Registered: ‎03-19-2018

Re: LGS308 LACP/LAGing with a Synology 1515+

Hi,

 

Same question here with the same switch...

If I read the IEEE 802.3ad wikipedia article, the article says (in french) that the speed goes more than only one cable so with 2 cables (which i have), I can have 2000Mpbs instead of only 1000.

 

So what's wrong ?

 

Thx.

Expert
Posts: 14,287
Registered: ‎01-18-2013

Re: LGS308 LACP/LAGing with a Synology 1515+

[ Edited ]

A 1000mbps port is just that. Making a LAG of two of them provides a total of 2000mbps load balanced throughput but any single connection maximum is still 1000mbps.


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Posts: 10
Registered: ‎03-19-2018

Re: LGS308 LACP/LAGing with a Synology 1515+

Yes I know...

 

But my goal is to double the speed between a client (a Mac under High Sierra) where I connect 2 ethernet ports and a Synology NAS where I connect 2 ethernet ports too.

 

It's OK for the NAS if I read the settings :

2018-03-19 17.30.02.jpg

 

The setting is in ad :

2018-03-19 17.30.15.jpg

 

And it seems to be OK for the Mac too :

2018-03-19 17.38.27.jpg

 

Of course, the ports on the switch are like this for the NAS :

2018-03-19 17.29.21.jpg

 

And like that for the Mac :

2018-03-19 17.36.34.jpg

 

So what's wrong ? I bought the LGS308 for this function...

 

Thx.

Posts: 10
Registered: ‎03-19-2018

Re: LGS308 LACP/LAGing with a Synology 1515+

I had a doubt but in the specs, there is the LACP line :

"Link Aggregation:
IEEE 802.3ad LACP, up to 4 groups with up to 8 ports per group".

 

So how to activate it ?

 

Thx.

Posts: 10
Registered: ‎03-19-2018

Re: LGS308 LACP/LAGing with a Synology 1515+

And for sure, Mac OS use LACP and not just a simple LAG :
"macOS uses the Link Aggregation Control Protocol (LACP) to negotiate the link aggregation. LACP must be supported on all link aggregation devices involved."

 

Thx.

Expert
Posts: 14,287
Registered: ‎01-18-2013

Re: LGS308 LACP/LAGing with a Synology 1515+

[ Edited ]

I'm not sure if you understand how LACP works but if you want to really increase single connection speeds you will need to go to all 10gig Ethernet or wireless AX hardware. 


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Posts: 10
Registered: ‎03-19-2018

Re: LGS308 LACP/LAGing with a Synology 1515+

It could be a solution indeed but when I bought the switch 2 years ago, 10gigbaits was very expensive and I don't want to renew all my stuff...

 

But on all the articles I read, it is written I can double up the speed with LACP, so it's a lie ?...