Force10 MXL Switch: Port Numbering

This is a quick cheat sheet fro MXL port numbering schema, which might seem a bit confusing if you see a MXL switch for the first time.

force10_mxl_10-40gbe_dsc0666

Above is the picture of the switches that I’ve worked with. On the right we have a 2-Port 40GbE built-in module. And then there’re two expansion slots – slot 0 in the middle and slot 1 on the left. Each module has 8 ports allocated to it. The reason being that you can have 2-Port 40-GbE QSFP+ modules in each of the slots, which can operate in 8x10GbE mode. You will need QSFP+ to 4xSFP+ breakout cables, but that’s not the most common scenario anyway.

As we have 8 ports per slot, it would look something like this:

mxl-external-port-mappings

This picture is more for switch stacking, but the rightmost section should give you a basic idea. One of the typical MXL configurations is when you have a built-in 40GbE module for stacking and one or two 4-Port SFP+ expansion modules in slots 0 and 1. In that case your port numbers will be: 33 and 37 for 40GbE ports, 41 to 44 in expansion slot 0 and 49 to 52 in expansion slot 1.

11-01-05-hybrid-qsfp-plus4-port-SFP-module

As you can see for QSFP+ module switch breaks 8 ports in two sets of 4 ports and picks the first number in each set for 40GbE ports. And for SFP+ modules it uses consecutive numbers within each slot and then has a 4 port gap.

Port numbering is described in more detail in MXL’s switch configuration guide, which you can use for your reference. But this short note might help someone to quickly knock that off instead of browsing through a 1000 page document.

Also, I’ve seen pictures of MXL switches with a slightly different port numbering: 41 to 48 in slot 0 and 33 to 40 in slot 1. Which seems like a mirrored version of the switch with a built-in module on the opposite side of it. I’m not sure if it’s just an older version of the same switch, but keep in mind that you might actually have the other variation of the MXL in your blade chassis.

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One Response to “Force10 MXL Switch: Port Numbering”

  1. Force10 MXL Switch: Stacking | Niktips's Blog Says:

    […] NetApp and VMware stuff « Force10 MXL Switch: Port Numbering […]

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