No it isn’t useless. The trace property is inherited.
From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of wei_sky2...@163.com
Sent: Sunday, September 22, 2019 9:11 PM
To: vpp-dev@lists.fd.io
Subject: Re: [vpp-dev] About VPP trace，why I trace add ip4_lookup, but when i
show ,it does't have any record?
[Edited Message Follows]
Thanks for reply
Is trace function useless in internal nodes?
I often see the following code in internal nodes:
if(node->flags & VLIB_NODE_FLAG_TRACE)
{
.......
}
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