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can this be a unicast flooding problem? pls tell me if you need further

-----Original Message-----
From: Jason R. Martin [mailto:nsxfreddy@xxxxxxxxx]
Sent: Wednesday, July 27, 2005 11:01 PM
To: sameer.neugui@xxxxxxxxxxxxxxxx; Linux 802.1Q VLAN
Subject: Re: [VLAN] STP+VLAN

On 7/27/05, sameer <sameer.neugui@xxxxxxxxxxxxxxxx> wrote:
> Hi all,
> I am basically facing a problem with STP. But since STP is related to VLAN
> in some respect I guess there would be someone here who can help me.
> Background:
> We have developed a layer two switch. This uses Cirrus logic's ep9301
> processor, embedded Linux 2.4.21 kernel as the OS and zarlink's switch
> controller.
> The observation:
> 1)we have 2 switches, switch A and switch B
> 2)port 1 and port 2 of switch A are connected to port 1 and port 2 of
> B
> 3)1 PC is connected to port 0 of switch A and another to COM port of
> A to observe STP
> 4)We restart the 2 switches and observe that one of the links is blocked
> the other in forwarding state. STP is always enabled on reboot
> 6)We start to ping switch A and the switches and the two PC hang.
> 7)the LEDs on the switch device that signify the activity are seen
> continuously glowing.
> 8)switch A and B, PC 1 and 2 cannot be accessed at all.
> 9) We remove one of the links and the STP reconfigures and the switch A
> be pinged.
> 10)Most of the time we have observed, although not a confirmed pattern,
> if we remove the blocked link, the STP just disables the port on switch A
> (we have not observed the counter part on the switch B
> 11)Neither the switches nor the PCs were on the rest of the company
> Its not a hang exactly as upon some topology change the system is back to
> working. I also checked on the internet. On cisco site I found something
> called unicast flooding. Is this the reason for the system to blog down?
> what would be the fix or some pointer in this regard?

Sounds to me like the link that is "blocked" isn't really blocked and
you're getting a loop.


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