Try portfast, if connecrivity issue.
""John Gotti"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hey all...we are having a problem where workstations sporatically will not
> be able to obtain an IP address from our DHCP server. After about 4
minutes,
> you can perform a manual renew from WINIPCFG and you get your IP address.
> This has baffled me for quite some time and I have recently been told it
is
> our Cisco 2924 Switch to blame. The story I was told is below. I welcome
any
> comments for or against this opinion. Thank you for your time.
>
>
> "It appears the problem is connected to the spanning tree algorithm used
> by the CISCO switches. By default, ports on the switch block as they are
> initialised; during this phase the port is in its spanning tree algorithm
> learning and listening state - it is not forwarding. This is
specifically
> aimed at ports that will be used to connect to other switches/routers in a
> stack. After a default time (4 mins?) they switch to the standard
forwarding
> mode and everything seems normal, the problem is that you have missed all
> the important DHCP broadcast and acknowledgment from client to DHCP server
> during this period.
>
> You can change this default state by changing the PORT-FAST setting on
> each port. The port is then immediately in the FORWARDING mode as it is
> initialised. By default this setting is DISABLED, I have ENABLED all
> ports except the ports doing the linking to other switches"
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