Hi Sastry, 

Can’t do much without a backtrace. Also, not entirely sure how vcl got a reply 
if vpp crashed. 

Session layer is the main component of the host stack that keeps track of 
external apps and facilitates the exchange of data and notifications between 
apps (like vcl) and transports. So yes, it is important. 

Regards,
Florin

> On May 5, 2021, at 8:32 AM, Sastry Sista <sastry.si...@gmail.com> wrote:
> 
> Hi Florin,
>                      I tried to add session layer at vpp as below:
>
> session {
> session-baseva 0x2000000000
>   evt_qs_memfd_seg
>   event-queue-length 100000
> }
>
> vpp is still crashing and not able to run vpp. Also, is session layer 
> important for VCL application to run?
>
> I am still seeing "vl_api_app_attach_reply_t_handler:82: vcl<0:-1>: ERROR 
> attach failed: Unsupported application config (-108)" error at client.
>
> What is the best plan?
>
>
>
> With Regards
> Sastry
> 
> 
> 

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