"" Curious"" wrote in message
news:[EMAIL PROTECTED]
> Hello,
>
> I know that is a bad idea to configure a port with "portfast" when this
port
> connect with other switch (loops can be created), but the question is:
could
> I put a port connected to a router in portfast mode? A router is a layer 3
Sticking a router in a port fast port is probably okay, since there
should be no
Bpdu's generated by the router. Most Cisco switches don't allow the
trunk function
And the stp-portfast function on at the same time...you do not want the
portfast
Function enabled on trunks...
Larry Letterman
Cis
Curious 6/24/03 10:25:25 AM >>>
>Hello,
>
>I know that is a bad idea to configure a port with "portfast" when this
port
>connect with other switch (loops can be created), but the question is:
could
>I put a port connected to a router in portfast mode? A router is a layer 3
>device not a layer
chnologies
> 140 N. Rt. 303
> Valley Cottage, NY 10989
> 845-267-4000 x218
>
>
> -Original Message-
> From: Scott Morris [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, March 01, 2001 4:44 PM
> To: 'Chuck Church'; ''Ccielab' (E-mail)
-4000 x218
-Original Message-
From: Scott Morris [mailto:[EMAIL PROTECTED]]
Sent: Thursday, March 01, 2001 4:44 PM
To: 'Chuck Church'; ''Ccielab' (E-mail)'; 'Cisco@Groupstudy. Com
(E-mail)'
Subject: RE: Portfast
It's not specific to Windows 2000 machine
ailto:[EMAIL PROTECTED]]On Behalf Of
Chuck Church
Sent: Thursday, March 01, 2001 4:22 PM
To: 'Ccielab' (E-mail); Cisco@Groupstudy. Com (E-mail)
Subject: RE: Portfast
If this bdpu guard works as it supposed to, I'll definitely use it. Windows
2000 machines seem to need portfast for
-
From: Chuck Church [mailto:[EMAIL PROTECTED]]
Sent: Thursday, March 01, 2001 1:22 PM
To: 'Ccielab' (E-mail); Cisco@Groupstudy. Com (E-mail)
Subject: RE: Portfast
If this bdpu guard works as it supposed to, I'll definitely use it. Windows
2000 machines seem to need portfast fo
'McCallum, Robert'; 'John Chang'; 'Ccielab' (E-mail);
Cisco@Groupstudy. Com (E-mail)
Subject: RE: Portfast
Check out the new portfast bpdu guard feature. It can shut down ports that
have portfast enabled when detecting bpdus on the line.
Keith
-Original Message---
cielab' (E-mail); Cisco@Groupstudy. Com (E-mail)
Subject: RE: Portfast
No,
The problem occurs if he creates a loop i.e. you have a main switch a cable
from the main switch goes to user A. User A decides to connect a hub and a
few terminals - Outcome fine. User B then says hey user A can you ac
If you are not going to form the loops you can turn the Spanning Tree
off. But if you connect a hub or a switch or something you are not going
to switch on/off very often, there's no point. You connect the hub to
the switchport, you wait 30 seconds, you forget about it forever.
Conecting/disconnec
John,
It should not cause any problems provided that the device in question is not
using any kind of dual uplinks. Basically, all portfast does is allow that
port to skip through a majority of the Spanning Tree protocol checking
process. Obviously this is okay for end stations and servers.
W
member run about like loonies
trying to find this fault which occurs only when the user decides to switch
on his equipment.
-Original Message-
From: John Chang [mailto:[EMAIL PROTECTED]]
Sent: 01 March 2001 15:34
To: McCallum, Robert
Subject: RE: Portfast
Let me see if I got this correct. If
yes, but only if he then connects another link to another hub / switch and
causes a bridging loop.
-Original Message-
From: John Chang [mailto:[EMAIL PROTECTED]]
Sent: 01 March 2001 15:08
To: [EMAIL PROTECTED]
Subject: Portfast
In the below website it says not to have portfast on if you
[mailto:[EMAIL PROTECTED]]
Sent: Thursday, September 07, 2000 9:07 PM
To: ed smith; [EMAIL PROTECTED]
Subject: Re: Portfast ???
You have to enable it on an interface-by-interface basis and make sure the
links only connect to workstations not to other network equipment.
Duck
- Original Message
You have to enable it on an interface-by-interface basis and make sure the
links only connect to workstations not to other network equipment.
Duck
- Original Message -
From: ed smith <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, September 06, 2000 6:32 AM
Subject: Portfast ?
I see no reason you cannot bring up both switches at the same time. Once the
2924C has been up for a minute or so you can start pulling the patch cables
from the old switch and start putting them in the new one. Your switch over
time will be essentially painless as long as the new switch is confi
Patrick,
I will check for loops, however the use of portfast is to put the port
into the forwarding stage of the STP upon connectivity. The alogorithm
will still run in the background, however you do run the risk of a loop
until the port discovers this. If a loop is indeed introduced the port
w
Title: RE: Portfast ???
Set portfast on any ports connecting to workstations..this will greatly improve the negotiation time when the station is coming up. Just do not set port fast on ports connecting to hubs or switches as it does not check for loops via spanning tree
Patrick
only use portfast on workstations or servers. it will prevent another
switch or hub from participating in the spanning tree. I don't think I
would enable portfast just to save users 20 seconds or so of startup one
time while you swap switches.
Unless you are in a 24x7 shop there must be some
Portfast is implemented on a per port basis. It is used (a) when
spanning-tree is used on the switch and (b) on ports that have directly
connected PCs. Without portfast spanning-tree can take up to 40 seconds to
go to forwarding mode. This can be a major "O bleep!" for PCs trying to log
onto a net
NT and 2000 will have major latency when connecting
directly to a switch without portfast. There is a
article on www.cisco.com about this problem. The
problem is not cisco related it will happen on any
switch. http://www.cisco.com/warp/public/473/12.html
> I'm swapping out a 2900XL with a 29
Would this help a problem I have with a dhcp client timing out? DHCP works
fine but between the switch and my laptops pcmia card it takes to long for
the link to come up. By the time it does DHCP times out.
On Fri, 14 Jul 2000, you wrote:
> Portfast simply allows the port to begin forwarding im
Switch ports that connect to routers or other switches should have portfast
disabled.
Only enable portfast on switch ports that you are certain connect directly
to workstations.
NT workstations are prone to needing portfast enabled to make connections to
the PDC at boot-up.
Portfast places a por
Chen,
You don't want to enable portfast on ANY port that hooks up to a multiport
device. Switch, router, hub, even a multi-homed server. Only enable it on a
device that has a SINGLE connection to the network. Even at that it would
be a good idea to set up the portfast guard stuff unless you can
Portfast simply allows the port to begin forwarding immedtiatly as opposed
to going through the blocking, litening, learning, forwarding states that a
spanning tree port goes through. It can safely be disabled if you do not
have redundant paths.
-Original Message-
From: Chen, Scott [mailt
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