[BBLISA] Connecting 10GBE to GigE

[Matt Finnigan]

NFS is an IP protocol, it doesn't negotiate layer2 speeds. So I doubt
that's it. Sounds like you've narrowed the problem down to the brocade
switch. Are there firmware updates for it? Have you engaged their support?

On Saturday, February 2, 2013, Daniel Feenberg wrote:

>
> We have a Brocade 24 port 10GBE switch connected to a Dell GigE switch
> using one of the 4 GigE ports on the Brocade. There is NFS traffic accross
> the link, not much else. Every few weeks the link refuses to carry any
> traffic. Details:
>
>    0) There is no error message on the Brocade console.
>    1) The lights on both switches say the link is up.
>    2) Power-cycling the Dell has no effect.
>    3) There are devices on the other 3 GigE ports, they are
>       unaffected.
>    4) Replacing the Dell with Netgear has no effect.
>    5) The Brocade says the link is up, but if the link is disabled
>       the Brocade won't reenable it.
>    6) Traffic within each switch is normal - only the link is affected.
>    7) A warm boot of the Brocade restores service every time.
>
> Any thoughts about what could cause this? I don't think it is a problem
> with the patch cable (0% packet loss) or a loop (checked for that), or
> authentication (switch is in factory default configuration other than IP
> address and logging).
>
> Is there some reason that NFS can't negotiate the difference in speed?
>
> dan feenberg
>
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