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

Kevin Graham kgraham at industrial-marshmallow.com
Thu May 6 13:01:51 EDT 2010


What's the STP state for this interface on the VLAN in question? There's not much information to go on but this would be both expected and correct if it's blocking.

[sent from my mobile]

On May 6, 2010, at 7:46 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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