Tuesday, April 2, 2013

Brocade FCX: How To Enable Jumbo Frames

So I had my SAN guy come up and ask me to enable jumbo frames on the network gear (Brocade in this network).  It seems that his SAN needs this capability enabled.  So, it seems that the default MTU on the Brocade is 1500.  And they need an MTU of around 9000.  It just so happens that the Brocade (FCX in this case) will go up to an MTU of 10240.  See below:

BR-telnet@Core(config)#jumb
  jumbo                         gig port jumbo frame support (10240 bytes)

Now, to enable jumbo frames on the Brocade, use the 'jumbo' command.  Its going to take a reboot to enable it.  See below:

BR-telnet@Core(config)#jumbo
Jumbo mode setting requires a reload to take effect!
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7 comments:

  1. AnonymousApril 10, 2014 at 2:52 AM

    Thanks! Could you please advise whether there were any performance impacts (CPU in particular) on the switch after jumbo frame was enabled? We're using ICX6610 with L2 image and I got the same request from our SAN crew, but a bit concerned about performance impact. I understand that it will greatly depend on the load... For example, in our case ~20 ports out of 48 might use different jumbo frames. But in general, have you noticed any increase of CPU usage?

    ReplyDelete
    Replies
    1. ShaneApril 10, 2014 at 3:43 PM

      Im sure it would increase somewhat as traffic comes through, but I have never seen 'significant' increases in CPU usage.

      Delete
  2. AnonymousAugust 27, 2015 at 9:11 AM

    hi Shane, what will happen if i enable the jumbo frame in my L2 image brocade switch 6450 but the San storage connected to it never configure the MTU size(or SAN storage by default should have jumbo frame support?)? Lately i enable jumbo frame on my brocade switch 6450, after that I found that the san storage connected to this switch not able to ping anymore.

    ReplyDelete
    Replies
    1. ShaneAugust 27, 2015 at 9:17 AM

      Not sure on that. I havent seen that issue before, so Im not sure what to tell you on that.

      Delete
  3. AnonymousSeptember 13, 2015 at 7:30 AM

    Can we enable Jumbo frames on particular ports in ICX-6430 Switches. Because only few ports are going to connect SAN network. We can utilize other ports for normal Server connectivity.

    ReplyDelete
    Replies
    1. ShaneSeptember 13, 2015 at 9:36 AM

      Maybe. I'll have to look into it. Senlems as though you should be able to.

      Delete
    2. ShaneSeptember 13, 2015 at 9:36 AM

      Maybe. I'll have to look into it. Senlems as though you should be able to.

      Delete

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