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We have a 2Gb connection (2x1Gb) in to a Dell X1008 with LACP LAG configured, then out through via same LACP config to X1 & X4 LAG on the NSA5600, but I never get any X1 output over 1Gbps. It's stuck at about 980Mbps all the time when it's busy.

Do I need to set something else to get my throughput higher?

Category: Mid Range Firewalls

Best Answer

    AjishlalAjishlal Community Legend ✭✭✭✭✭
    Answer ✓

    Hi @ChrisL

    I am not sure your X series switch will support below commands. Please contact your switch vendor before applying any changes.


    Use the hashing-mode command to set the hashing algorithm on trunk ports. Use the no hashing-mode command to set the hashing algorithm on trunk ports to the default.


    hashing-mode mode

    mode — Mode value in the range of 1 to 7.

    Range: 1–7:

    1 — Source MAC, VLAN, EtherType, source module, and port ID

    2 — Destination MAC, VLAN, EtherType, source module, and port ID

    3 — Source IP and source TCP/UDP port

    4 — Destination IP and destination TCP/UDP port

    5 — Source/destination MAC, VLAN, EtherType, and source MODID/port

    6 — Source/destination IP and source/destination TCP/UDP port

    7 — Enhanced hashing mode. This mode is not available on Dell EMC Networking N1100-ON/N1500 Series switches.

    Default Configuration

    The default hashing mode is 7—Enhanced hashing mode. On Dell EMC Networking N1100-ON/N1500 Series switches, the default hashing mode is 5


  • Hi @CHRISL,

    Thank you for visiting SonicWall Community.

    Have you configured Dynamic LAG or Static LAG on the firewall?  


    Saravanan V

    Technical Support Advisor - Premier Services

    Professional Services

  • ChrisLChrisL Newbie ✭

    Thanks for replying.

    Where would I check this? I don't see an obvious place to set this.

  • AjishlalAjishlal Community Legend ✭✭✭✭✭

    Hi @ChrisL,

    I would like to know how you tested the maximum bandwidth? Example individual data traffic or multiple?

    For example, your total bandwidth of a 2 port LAG LACP is 2Gbps, an individual flow will max out at 1Gbps ( I think you are getting that).

    LAG without Link Aggregation Control Protocol (LACP) is a static configuration, in which each pair of ports in a LAG require manual configuration respectively. However, LACP enabled ports are dynamic configuration, which enable to auto-configure into trunk groups when building LAG.

  • Hi @ChrisL,

    If you have just enabled LAG in the advanced tab of the SonicWall interfaces, then its static. If you are using Switching tab and using LAG over there, its dynamic.


    Saravanan V

    Technical Support Advisor - Premier Services

    Professional Services

  • AjishlalAjishlal Community Legend ✭✭✭✭✭

    Hi @ChrisL ,

    For more about the LAG & LACP configuration in sonicwall please refer below link;

  • ChrisLChrisL Newbie ✭

    I used Switching > Link Aggregation to set this up so it will be dynamic in that case.

    @Ajishlal - I am just checking the Ingress/Egress Bandwidth chart on the live monitor to see what the rate is. I thought I would see the bandwidth go above 1Gbps?

  • AjishlalAjishlal Community Legend ✭✭✭✭✭
    edited November 2020

    Hi @ChrisL

    you will not experience any increase in the throughput for one singular flow because that flow will still be carried by a single link in the bundle. Only when you have multiple flows between various sources and/or destinations, these flows will be distributed across multiple links in the bundle (LAG LACP), and the aggregate throughput will be higher.

    I hope its clear your doubts about the LAG throughput.

  • ChrisLChrisL Newbie ✭

    I'm not sure I follow, there are many hundreds of individual connections going through the FW at the moment.

  • AjishlalAjishlal Community Legend ✭✭✭✭✭

    Hi @ChrisL,

     Link Aggregation requires a matching configuration on the switch. The switch's method of load balancing varies, depending on the vendor.

    As well as make sure Set the Link Speed for the interface to Auto-Negotiate.

  • ChrisLChrisL Newbie ✭

    Both sides are set to Auto-negotiate speeds. Flow control is disabled on the switch LAG but I don't see an option for that on the NSA side.

    The Load balance options on the Sonicwall are below, but I can't find a description of what each would be best used for and thus how that would match a Dell switch?

    • SRC_MAC, ETH_TYPE, VLAN, INTF (default)
  • [Deleted User][Deleted User] Cybersecurity Overlord ✭✭✭

    Hi @ChrisL ,

    Were you able to successfully resolve your issue?

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