[202205 cherry pick] test_route_flap for voq_chassis (#8971)

This is cherry-pick PR of #8908

tests/common/devices/multi_asic.py

@@ -655,6 +655,29 @@ def get_internal_bgp_peers(self):
             )
         return bgp_internal_neighbors
 
+    def get_voq_inband_interfaces(self):
+        """
+        This Function is only applicable on VOQ Chassis.
+        Get VOQ Internal Inband Interfaces. API iterates through frontend ASIC
+        index to get the VOQ Inband Interfaces from running configuration.
+        Not using BGP_VOQ_CHASSIS_NEIGHBOUR peer ips  since they are not referenced in
+        next hops of route.
+        Returns:
+              List of [voq_inband_interfaces]
+        """
+        if not self.sonichost.is_multi_asic:
+            return {}
+        voq_inband_interfaces = {}
+        for asic in self.frontend_asics:
+            config_facts = self.config_facts(
+                host=self.hostname, source="running",
+                namespace=asic.namespace
+            )['ansible_facts']
+            voq_inband_interfaces.update(
+                config_facts.get("VOQ_INBAND_INTERFACE", {})
+            )
+        return voq_inband_interfaces.keys()
+
     def docker_cmds_on_all_asics(self, cmd, container_name):
         """This function iterate for ALL asics and execute cmds"""
         duthost = self.sonichost

tests/route/test_route_flap.py

@@ -200,6 +200,8 @@ def is_dualtor(tbinfo):
 def get_dev_port_and_route(duthost, asichost, dst_prefix_set):
     # Get internal bgp ips for later filtering
     internal_bgp_ips = duthost.get_internal_bgp_peers().keys()
+    # Get voq inband interface for later filtering
+    voq_inband_interfaces = duthost.get_voq_inband_interfaces()
     dev_port = None
     route_to_ping = None
     for dst_prefix in dst_prefix_set:
@@ -219,17 +221,23 @@ def get_dev_port_and_route(duthost, asichost, dst_prefix_set):
                         continue
                     if per_hop['ip'] in internal_bgp_ips:
                         continue
+                    if per_hop['interfaceName'] in voq_inband_interfaces:
+                        continue
                     if 'IB' in per_hop['interfaceName'] or 'BP' in per_hop['interfaceName']:
                         continue
                     dev_port = per_hop['interfaceName']
+                    break
         else:
             dev = json.loads(asichost.run_vtysh(cmd)['stdout'])
             for per_hop in dev[route_to_ping][0]['nexthops']:
                 if 'interfaceName' not in per_hop.keys():
                     continue
+               if per_hop['interfaceName'] in voq_inband_interfaces:
+                    continue
                 if 'IB' in per_hop['interfaceName'] or 'BP' in per_hop['interfaceName']:
                     continue
                 dev_port = per_hop['interfaceName']
+                break
     pytest_assert(dev_port, "dev_port not exist")
     return dev_port, route_to_ping