[Bridge] bridge stp problem

[Bridge] bridge stp problem

[munro]

Hi, ppl,

I am using kernel 2.4.25 and  having this peculiar problem on my 
ixp425.  When i have 2 ethernet ports of the board connected to the same 
linksys switch running STP.  ixp0  and ixp1 are the name of my ethernet 
ports  enslaved to the same bridge( br0)and my PC is also connected to 
the switch.
                      
 
               IXP425 -br0 (192.168.2.1)

             |_ixp0|---  |        |          (192.168.2.11)
             |_ixp1|---- |Linksys |----------<PC>  

 
When i ping from my PC to the  board (when both ixp0 and ixp1 are 
connected to the switch), everything works fine.
In that case ixp1 is in blocking state and ixp0 is in  forwarding state.

The issue here is  when i unplug ixp0 from the switch (the one which is 
forwading state),  ixp1 comes to forwardinmg state after the state 
changes(listening-learning---forwading), but there is a huge delay of 
around 15-17 mins till i can ping  the board(IXP425) from my PC. i went 
through the bridging code and put debug messages to see that it comes to 
forwarding state immediately.


On the board if i sniff using ethereal, it shows that my ICMP request 
never goes through till 17 mins..

AFter 17 mins, it starts pining ok.

Now thats very strange. WHo induces this delay of 17 mins after the 
topology changes.
Pls. advise !! very urgent .

Re: [Bridge] bridge stp problem

[Stephen Hemminger]

On Fri, 22 Apr 2005 10:24:50 +0800
munro <munro.biswal@smartbridges.com> wrote:

> Hi, ppl,
> 
> I am using kernel 2.4.25 and  having this peculiar problem on my 
> ixp425.  When i have 2 ethernet ports of the board connected to the same 
> linksys switch running STP.  ixp0  and ixp1 are the name of my ethernet 
> ports  enslaved to the same bridge( br0)and my PC is also connected to 
> the switch.
>                       
>  
>                IXP425 -br0 (192.168.2.1)
> 
>              |_ixp0|---  |        |          (192.168.2.11)
>              |_ixp1|---- |Linksys |----------<PC>  
> 
>  
> When i ping from my PC to the  board (when both ixp0 and ixp1 are 
> connected to the switch), everything works fine.
> In that case ixp1 is in blocking state and ixp0 is in  forwarding state.
> 
> The issue here is  when i unplug ixp0 from the switch (the one which is 
> forwading state),  ixp1 comes to forwardinmg state after the state 
> changes(listening-learning---forwading), but there is a huge delay of 
> around 15-17 mins till i can ping  the board(IXP425) from my PC. i went 
> through the bridging code and put debug messages to see that it comes to 
> forwarding state immediately.
> 

It may not help, but 2.6 kernel has support for detecting carrier transistions
and failing over faster.

> On the board if i sniff using ethereal, it shows that my ICMP request 
> never goes through till 17 mins..
> 
> AFter 17 mins, it starts pining ok.
> 
> Now thats very strange. WHo induces this delay of 17 mins after the 
> topology changes.
> Pls. advise !! very urgent .
> 

Is there a chance some other bridge changing and becoming root