What you were told sounds correct to me. If you have a port that is only
connecting to workstations or servers then turn on portfast for that
port. That will prevent you from having problems with DHCP.
At 08:43 AM 4/30/01, you wrote:
>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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