interface: T3782: Fix unexpected delete qdisc rule

Some tc qdisc rules are generated by old perl code
It prevent to unexpected override this code by python.

1 files changed, 8 insertions, 6 deletions

diff --git a/python/vyos/ifconfig/interface.py b/python/vyos/ifconfig/interface.py
index 2a7b1eadc..04e139805 100755
--- a/python/vyos/ifconfig/interface.py
+++ b/python/vyos/ifconfig/interface.py
@@ -1156,12 +1156,14 @@ class Interface(Control):
             source_if = next(iter(self._config['is_mirror_intf']))
             config = self._config['is_mirror_intf'][source_if].get('mirror', None)
 
-        # Please do not clear the 'set $? = 0 '. It's meant to force a return of 0
-        # Remove existing mirroring rules
-        delete_tc_cmd  = f'tc qdisc del dev {source_if} handle ffff: ingress 2> /dev/null;'
-        delete_tc_cmd += f'tc qdisc del dev {source_if} handle 1: root prio 2> /dev/null;'
-        delete_tc_cmd += 'set $?=0'
-        self._popen(delete_tc_cmd)
+        # Check configuration stored by old perl code before delete T3782
+        if not 'redirect' in self._config:
+            # Please do not clear the 'set $? = 0 '. It's meant to force a return of 0
+            # Remove existing mirroring rules
+            delete_tc_cmd  = f'tc qdisc del dev {source_if} handle ffff: ingress 2> /dev/null;'
+            delete_tc_cmd += f'tc qdisc del dev {source_if} handle 1: root prio 2> /dev/null;'
+            delete_tc_cmd += 'set $?=0'
+            self._popen(delete_tc_cmd)
 
         # Bail out early if nothing needs to be configured
         if not config: