Ahhh, so the delay is just the VLAN security. That makes total sense. I'm
guessing you can usually turn that off somehow so that a port will
immediately give you an IP when you plug in? Or, if you plug in a cheap
unmanaged switch to that port, it will keep that port active, and anything
you plug into the cheap switch will get an IP immediately. I imagine
disabling the port security would be the way to go to speed up DHCP, or is
there a better method?
On Wed, May 4, 2011 at 10:58 PM, Jimmy Hess <mysidia@gmail.com> wrote:
> On Wed, May 4, 2011 at 10:38 PM, Chris Jones <techmaster@gmail.com> wrote:
> > link. Works perfect, except DHCP takes a few minutes when you plug into
> a
> > port assigned to any of those VLANs that are using DHCP. It caused
> issues
>
> Are you saying a workstation takes a few minutes to obtain an IP address
> using
> DHCP after you plug it into a port?
>
> Remember, these managed switches support spanning tree protocol, for
> loop avoidance.
> Depending on make/model
> Unless it's off by default for your untagged ports or disabled
> globally or VLAN-wide
> on your managed switch, or you manually fast forwarded the untagged
> ports...
>
> There will be a delay after link up before any port becomes unblocked and
> the PC is able to receive any traffic; that can mean DHCP clients need to
> timeout and retry.
>
> 50 seconds can seem like 5 minutes, if DHCP doesn't timeout the first
> request
> until a few minutes.
>
> --
> -JH
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Received on 05/05/11
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