Packet trace can be started only from packet input nodes, such as dpdk-input or 
vhost-user-input, etc.   -John

From: vpp-dev-boun...@lists.fd.io [mailto:vpp-dev-boun...@lists.fd.io] On 
Behalf Of Dharmaray Kundargi
Sent: Wednesday, May 31, 2017 1:44 AM
To: vpp-dev@lists.fd.io
Subject: [vpp-dev] [VPP-Dev] Packet tracer, trace packet from an intermediate 
graph node.

All,
Is it possible to start tracing a packet from lets' say 'ip4-icmp-input' for 
ICMP ping packets instead of dpdk-input to debug packets of my interest.
vppctl trace add ip4-icmp-input 10 instead of vppctl trace add dpdk-input 10
Tried, that does not work but tracing from the dpdk-input works.

Documentation says ...
First, identify the input node from which the traffic originates. (See also the 
command show run.)
But wanted to check on that feature if useful ...

Regards
Dharmaray S Kundargi

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