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

[Andras Toth]

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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