1 files changed, 3 insertions, 0 deletions
diff --git a/scripts/automation/trex_control_plane/stl/trex_stl_lib/trex_stl_client.py b/scripts/automation/trex_control_plane/stl/trex_stl_lib/trex_stl_client.py
index 2c1fa5e9..b4a7b4c1 100755
--- a/scripts/automation/trex_control_plane/stl/trex_stl_lib/trex_stl_client.py
+++ b/scripts/automation/trex_control_plane/stl/trex_stl_lib/trex_stl_client.py
@@ -2234,6 +2234,9 @@ class STLClient(object):
 
         # for dual mode check that all are masters
         if is_dual:
+            if not pcap_filename.endswith('erf'):
+                raise STLError("dual mode: only ERF format is supported for dual mode")
+
             for port in ports:
                 master = port
                 slave = port ^ 0x1