Issue with File Transfer Speeds using an ATP800

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  • PeterUK
    PeterUK Posts: 3,939  Guru Member
    100 Answers 2500 Comments Friend Collector Seventh Anniversary
    edited August 12

    Unfortunately LAG does not work like that by design I'm not sure someone said no but I think the reason has to do with packets arriving out of order which I don't see why that should be a problem but they think it is.

    Their are many LAG hash types IP/MAC by source and destination and some do by ports (TCP/UDP) but in short lets say the hash LAG is by IP source and destination between two switches in a two port LAG and a computers on either side if the switches.

    Ports 27 and 28 of each switch are in the LAG

    Switch 1
    PC A 192.168.0.2
    PC B 192.168.0.3
    PC C 192.168.0.4
    PC D 192.168.0.5

    Switch 2
    PC E 192.168.0.6
    PC F 192.168.0.7
    PC G 192.168.0.8
    PC H 192.168.0.9

    a TCP session from PC A to E will use port 27 of the LAG if PC B and PC F start a session port 28 of the LAG will be used Using the Full LAG

    But a TCP session from PC A to E will use port 27 of the LAG if PC C and PC G start a session port 27 of the LAG will be used due to the hash of the LAG sending packets out a given port meaning the LAG can only be fully used between odd and even IP source and destination to try and even out the traffic by the LAG and as you can see not a good system.

  • NEP
    NEP Posts: 92  Ally Member
    First Comment Friend Collector Third Anniversary

    I don't know enough about LAG but what you are saying sounds plausible/correct. And I think I followed what you said at the bottom about them being on the same port if they are the same IP. However, it would stand to reason that if all of the even IPs are on one port and all odds on another, it has to be better than all of them being on one. I'd also think that this would improve even more with more ports. Maybe not. What it did remind me of is the quote…

    "You can please some of the people all of the time and you can please all of the people some of the time, but you can't please all of the people all of the time."

    By the way, thank you for all the replies. The insight is appreciated. My coworker and I have noticed you in other threads that we've posted and have debated about what you do given getting responses in the middle of the day :-) Though I suppose if UK is an indicator it would be late afternoon to evening. Anyway, thanks again.

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