[c-nsp] C3750E 10GE Interface: Problem with L2 broadcast/ARP

[Christian Schuler]

-       we are running MST, the spanning tree state ist FWD

-       I see unicast packets on the link, and incoming broadcasts from
the remote end 

 

CS7#show spanning-tree interface te1/0/2

 

Mst Instance        Role Sts Cost      Prio.Nbr Type

------------------- ---- --- --------- --------
--------------------------------

MST0                Desg FWD 200000    128.54   P2p

CS7#

 

 

Von: ernst at shreddedmail.com [mailto:ernst at shreddedmail.com] Im Auftrag
von Rick Ernst
Gesendet: Donnerstag, 6. Mai 2010 17:44
An: Christian Schuler
Betreff: Re: [c-nsp] C3750E 10GE Interface: Problem with L2
broadcast/ARP

 

Is the port blocking in STP?  Are you seeing any traffic at all on the
port?

On Thu, May 6, 2010 at 6:46 AM, Christian Schuler
<cschuler at pironet-ndh.com> wrote:

Hi,

I'm debugging for some time on a problem with ARP resolution in our
datacenter environment. I found out that ARP requests are not forwarded
on one particular 10GE trunk interface, which is therefore unusable.
With a monitor and wireshark I see the ARP request coming in and going
out on all other ports, but not on Te1/0/2. Actually there are no L2
broadcast packets at all on this port.

We already made a software upgrade on the switch, with no improvement,
now we run:
WS-C3750E-48TD     12.2(52)SE

Has anybody an idea what is wrong ?

Port config is:
interface TenGigabitEthernet1/0/2
switchport trunk encapsulation dot1q
 switchport trunk native vlan 900
 switchport mode trunk
 switchport nonegotiate
 spanning-tree cost 200000


Christian

---------------------------------------------
PIRONET NDH Datacenter GmbH
Christian Schuler
http://www.pironet-ndh.com/itk



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