Re: Spanning tree can slow the network?

[Patrick Preuss <patrick.preuss () gmail com>]

Hi

You can trace on both end to See how well packets are placed time ( Maybe
ntp) is Importand. So You can see where your packets are Late.

Is this only this server?

Maybe you have a problem there? Time bewegen packets go to and come from
The server.

Try to get tcp Open sequence. Most of this programms are in memory and you
get neary The Network performance. Capture this on both ends best with tabs
they have less impact on The enviroment.
Patrick

Am Samstag, 14. Juli 2012 schrieb Andrea :

>  Thanks Patrick
>
> But I don't understand why this pause occurs always on this sequence:
>
> 716    8.713191000    192.168.1.12    192.168.1.2    TCP    54    50014 >
> microsoft-ds [ACK] Seq=47596 Ack=55126 Win=63153 Len=0
> 717    9.999665000    NexcomIn_1e:63:47
> Spanning-tree-(for-bridges)_00    STP    60    Conf. Root =
> 32768/0/00:10:f3:1e:63:45  Cost = 0  Port = 0x8003
> 718    10.689862000    192.168.1.12    192.168.1.2    TCP    362    [TCP
> segment of a reassembled PDU]
> 719    10.690663000    192.168.1.2    192.168.1.12    HTTP    79
> HTTP/1.1 100 Continue
>
>
> More than one second to receive another packet from the server(192.168.1.2) , I think this cannot be normal behaviour.
> How do I know if is normal or if it is possible optimize it?
>
>
>
> Hi Andrea,
>
>  Spanning Tree is normal in switched networks, Bridges must send them.
>
>  A Problem can be recalculation and reordetring of the tree.
>
>  If you what to read more about this you can read "interconnections" from
> radia perlmann.
>
>  Hth
>
>  Cheers
>
>  Patrick
>
> Am Samstag, 14. Juli 2012 schrieb Andrea :
>
> > Hello guys,
> > I've captured network traffic from some customer's LAN for monitor
> > behaviour of slow applications, in all cases I've found spanning tree
> > packets that slow the transactions, like this:
> >
> >     Spanning-tree-(for-bridge)  STP  Cost=4  port=0x8003
> >
> > every time there is a spanning tree packet follow after a pause of time
> > (about 1 sec.)  before arrives other data packets, this behaviour I've seen
> > either in LAN with many switches and in LAN when switch was only one.
> >
> > How it is possible? I don't have configure spanning tree on switches. Can
> > this be a normal behaviour ?
> >
> > Thanks
> > Andrew
> >
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