I responsed earlier!
Hi,
Why can't you just add your plugin to run after ethernet-input and enable it on 
all physical interfaces so that you can avoid spanning.
For your approach, are you sure you added your node to run after span-input and 
correctly placed on a feature-arc?pls run "show vlib graph" it will tell you 
where your node is plugged and it will give you clear idea on where your node 
is running.
-Sam.

    On Sunday, November 24, 2019, 07:54:27 AM PST, Damjan Marion via 
Lists.Fd.Io <dmarion=me....@lists.fd.io> wrote:  
 
 

On 19 Nov 2019, at 08:36, Muthukumar Sivaperumal 
<muthukumar.sivaperu...@veryxtech.com> wrote:
Hi Team,      We are  trying to implement a plugin to process all packets on 
virtual interface.  We are doing span  from physical interface to virtual 
interface on vpp,by running plugin arc node with interface-output. We are 
facing some problems. 
Could you please help us to resolve the issue by giving your valuable 
inputs/suggestions in this regard?.



Why do you need span for that? Why you just don't put your node to device-input 
arc directly?

-- Damjan


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