Hi, 

Is there anything configured on vpp side for session layer? Is this vpp 
21.06rc0 or something older? The error number seems to suggest an older 
release. 

One option would be to just comment out use-mq-eventfd and see if that fixes 
the issue. Message queue eventfds should work with the binary api, but the rest 
of the configs on vpp and vcl side must be compatible with it. 

Regards,
Florin

> On May 4, 2021, at 4:23 AM, sastry.si...@gmail.com wrote:
> 
> Hi,
>               I am trying to use vcl_test_client and using below vcl config:
> 
> While trying to run seeing the below error:
> 
> vppcom_connect_to_vpp:502: vcl<1876:0>: app (vcl_test_client) is connected to 
> VPP!
> vppcom_app_create:1203: vcl<1876:0>: sending session enable
> vppcom_app_create:1211: vcl<1876:0>: sending app attach
> vl_api_app_attach_reply_t_handler:82: vcl<0:-1>: ERROR attach failed: 
> Unsupported application config (-108)
> 
> Could you please let me know why this is unsupported at VPP?
> 
> vcl {
>   rx-fifo-size 400000
>   tx-fifo-size 400000
>   app-scope-global
>   api-socket-name /run/vpp/api.sock
>   #api-socket-name /run/vpp/cli.sock
>   use-mq-eventfd
> }
> 
> 
> 

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