[c-nsp] unicast IPv4 packets punted on Cisco 4500

[Martin T]

Lukas,

sorry, my mistake. I had spanning tree enabled for VLAN which I
configured as a RSPAN VLAN. In a nutshell, testing the link between
the tester and WS-C4506 port
Gi6/35(http://s17.postimg.org/nfh5vgoqn/loopback.png) works fine both
in case I use the RSPAN VLAN or "no mac address-table learning vlan".


Andras,

ideally I would like to test the link between the Ethernet tester and
WS-C4506 port Gi6/35 in a way that I loop back the traffic in the port
Gi6/35 itself. However, this does not seem to be possible in WS-C4506.
For example on ASR one could configure "loopback line" to interface.
However, looping back traffic with external connector is still far
better than nothing.


regards,
Martin

On 10/29/14, Andras Toth <diosbejgli at gmail.com> wrote:
> What are you trying to test exactly? Having packets coming back on the same
> L2 port in same VLAN where they were sent out is so rare that I can't think
> of anything suddenly which would do this in real life.
>
> You can just connect a cable from one port to another (form a loop) and
> send the traffic that way. You can disable STP and have a happy loop of
> packets flowing at wire-rate.
>
> Andras
>
>
> On Tue, Oct 28, 2014 at 10:03 AM, Martin T <m4rtntns at gmail.com> wrote:
>
>> Lukas,
>>
>> either I'm doing something wrong, but RSPAN VLAN trick this does not
>> work on WS-C4506(SUP WS-X4516-10GE). My physical topology can be seen
>> here: http://s17.postimg.org/nfh5vgoqn/loopback.png
>>
>> Both Gi6/35 and Gi6/36 are up:
>>
>> WS-C4506#sh int Gi6/35 status
>>
>> Port      Name               Status       Vlan       Duplex  Speed Type
>> Gi6/35                       connected    trunk        full    100
>> 10/100/1000-TX
>> WS-C4506#sh int Gi6/36 status
>>
>> Port      Name               Status       Vlan       Duplex  Speed Type
>> Gi6/36                       connected    trunk        full    100
>> 10/100/1000-TX
>> WS-C4506#
>>
>>
>> In addition, they have identical configuration:
>>
>> WS-C4506#sh run int Gi6/35
>> Building configuration...
>>
>> Current configuration : 209 bytes
>> !
>> interface GigabitEthernet6/35
>>  switchport trunk encapsulation dot1q
>>  switchport trunk native vlan 555
>>  switchport trunk allowed vlan 555
>>  switchport mode trunk
>>  load-interval 30
>>  speed 100
>>  duplex full
>> end
>>
>> WS-C4506#sh run int Gi6/36
>> Building configuration...
>>
>> Current configuration : 209 bytes
>> !
>> interface GigabitEthernet6/36
>>  switchport trunk encapsulation dot1q
>>  switchport trunk native vlan 555
>>  switchport trunk allowed vlan 555
>>  switchport mode trunk
>>  load-interval 30
>>  speed 100
>>  duplex full
>> end
>>
>> WS-C4506#
>>
>> ..and VLAN 555 is configured as RSPAN VLAN:
>>
>> !
>> vlan 555
>>  remote-span
>> !
>>
>> While traffic from tester reaches Gi6/36, it's dropped by the switch
>> and Gi6/35 output traffic counters stay zero.
>>
>>
>>
>> Gert,
>>
>> Yes, in port Gi6/36 is a hardware-loop. I made a drawing which
>> describes my setup: http://s17.postimg.org/nfh5vgoqn/loopback.png
>> Ideally I would like to loop back traffic to tester without using an
>> external loopback connector(for example Cisco ASR's support this), but
>> I guess this is impossible on WS-C4506?
>>
>>
>>
>> thanks,
>> Martin
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>