At 11:08 AM 4/30/01, Phil Barker wrote:
>Strongly in favour,
>
>A similar problem occurs in an IPX environment.
>Make sure all Servers/Clients are 'portfast' and
>switch/switch disable 'portfast'.
A similar problem happens with AppleTalk too. That's what we get for
expecting switches to replace hubs in a topology. ;-) They were designed as
bridges and to talk to other bridges. Despite switches being the
new-fangled thing (well, sort of new), a lot of their functionality is
vintage 1980s.
Priscilla
>Regards,
>
>Phil.
>--- John Gotti 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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________________________
Priscilla Oppenheimer
http://www.priscilla.com
Message Posted at:
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