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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