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diff --git a/docs/testing/developer/devguide/design/vswitchperf_design.rst b/docs/testing/developer/devguide/design/vswitchperf_design.rst
index 96ffcf62..de236ee2 100644
--- a/docs/testing/developer/devguide/design/vswitchperf_design.rst
+++ b/docs/testing/developer/devguide/design/vswitchperf_design.rst
@@ -439,6 +439,34 @@ Detailed description of ``TRAFFIC`` dictionary items follows:
details.
Data type: str
Default value: ''
+ 'scapy' - A dictionary with definition of a frame content for both traffic
+ directions. The frame content is defined by a SCAPY notation.
+ NOTE: It is supported only by the T-Rex traffic generator.
+ Following keywords can be used to refer to the related parts of
+ the TRAFFIC dictionary:
+ Ether_src - refers to TRAFFIC['l2']['srcmac']
+ Ether_dst - refers to TRAFFIC['l2']['dstmac']
+ IP_proto - refers to TRAFFIC['l3']['proto']
+ IP_PROTO - refers to upper case version of TRAFFIC['l3']['proto']
+ IP_src - refers to TRAFFIC['l3']['srcip']
+ IP_dst - refers to TRAFFIC['l3']['dstip']
+ IP_PROTO_sport - refers to TRAFFIC['l4']['srcport']
+ IP_PROTO_dport - refers to TRAFFIC['l4']['dstport']
+ Dot1Q_prio - refers to TRAFFIC['vlan']['priority']
+ Dot1Q_id - refers to TRAFFIC['vlan']['cfi']
+ Dot1Q_vlan - refers to TRAFFIC['vlan']['id']
+ '0' - A string with the frame definition for the 1st direction.
+ Data type: str
+ Default value: 'Ether(src={Ether_src}, dst={Ether_dst})/'
+ 'Dot1Q(prio={Dot1Q_prio}, id={Dot1Q_id}, vlan={Dot1Q_vlan})/'
+ 'IP(proto={IP_proto}, src={IP_src}, dst={IP_dst})/'
+ '{IP_PROTO}(sport={IP_PROTO_sport}, dport={IP_PROTO_dport})'
+ '1' - A string with the frame definition for the 2nd direction.
+ Data type: str
+ Default value: 'Ether(src={Ether_dst}, dst={Ether_src})/'
+ 'Dot1Q(prio={Dot1Q_prio}, id={Dot1Q_id}, vlan={Dot1Q_vlan})/'
+ 'IP(proto={IP_proto}, src={IP_dst}, dst={IP_src})/'
+ '{IP_PROTO}(sport={IP_PROTO_dport}, dport={IP_PROTO_sport})',
.. _configuration-of-guest-options: