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-rw-r--r--docs/gettingstarted/developers/vnet.md24
1 files changed, 16 insertions, 8 deletions
diff --git a/docs/gettingstarted/developers/vnet.md b/docs/gettingstarted/developers/vnet.md
index b8f878c2cd7..826af0a90a9 100644
--- a/docs/gettingstarted/developers/vnet.md
+++ b/docs/gettingstarted/developers/vnet.md
@@ -470,25 +470,33 @@ This should be of significant value when developing new vpp graph
nodes. If new code mispositions b->current_data, it will be completely
obvious from looking at the dispatch trace in wireshark.
-## pcap rx and tx tracing
+## pcap rx, tx, and drop tracing
-vpp also supports rx and tx packet capture in pcap format, through the
-"pcap rx trace" and "pcap tx trace" debug CLI commands
+vpp also supports rx, tx, and drop packet capture in pcap format,
+through the "pcap trace" debug CLI command.
-This command is used to start or stop a packet capture, or show
-the status of packet capture. Note that both "pcap rx trace" and
-"pcap tx trace" are implemented. The command syntax is identical,
-simply substitute rx for tx as needed.
+This command is used to start or stop a packet capture, or show the
+status of packet capture. Each of "pcap trace rx", "pcap trace tx",
+and "pcap trace drop" is implemented. Supply one or more of "rx",
+"tx", and "drop" to enable multiple simultaneous capture types.
These commands have the following optional parameters:
-on|off- Used to start or stop a packet capture.
+- <b>rx</b> - trace received packets.
+
+- <b>tx</b> - trace transmitted packets.
+
+- <b>drop</b> - trace dropped packets.
- <b>max _nnnn_</b> - file size, number of packet captures. Once
<nnnn> packets have been received, the trace buffer buffer is flushed
to the indicated file. Defaults to 1000. Can only be updated if packet
capture is off.
+- <b>max-bytes-per-pkt _nnnn_</b> - maximum number of bytes to trace
+ on a per-paket basis. Must be >32 and less than 9000. Default value:
+ 512.
+
- <b>intfc _interface_ | _any_</b> - Used to specify a given interface,
or use '<em>any</em>' to run packet capture on all interfaces.
'<em>any</em>' is the default if not provided. Settings from a previous