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SecurityPlus
SecurityPlus
Explorer III
June 10, 2020
Solved

Inter-switch link (ISL) - Bandwidth

  • June 10, 2020
  • 1 reply
  • 8224 views

Trying to learn more about the FortiSwitch. I see that when using multiple FortiSwitch switches it is common to use ISL between the switches. Will this restrict connection speed between switches? In other words what bandwidth does this ISL support?

    Best answer by ede_pfau

    I've noticed that a FortiLink internally is built by an aggregate link. So it's quite easy to increase the bandwidth. Same might be the case with ISLs.

    1 reply

    SecurityPlus
    SecurityPlusAuthor
    Explorer III
    June 12, 2020

    In other words, is the ISL connection limited to 1 GB on a 1 GB switch? If so this could create a bottleneck.

    tanr
    tanr
    New Member
    June 12, 2020

    For FortiLink/ISL adding multiple connections between the switches automagically gives you an aggregate.  At least that's what I've been doing on 6.0.

     

    If you're trying to set up with redundancy or MCLAG it might be different.

    ede_pfau
    SuperUser
    ede_pfauAnswer
    SuperUser
    June 12, 2020

    I've noticed that a FortiLink internally is built by an aggregate link. So it's quite easy to increase the bandwidth. Same might be the case with ISLs.

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