[vnet] Verify if BITMAP route exists before creating new one to avoid dublication (sonic-net#1272)

Signed-off-by: Volodymyr Samotiy <volodymyrs@mellanox.com>

Author: Volodymyr Samotiy

orchagent/vnetorch.cpp

@@ -795,6 +795,12 @@ bool VNetBitmapObject::addTunnelRoute(IpPrefix& ipPrefix, tunnelEndpoint& endp)
     sai_ip_address_t underlayAddr;
     copy(underlayAddr, endp.ip);
 
+    if (tunnelRouteMap_.find(ipPrefix) != tunnelRouteMap_.end())
+    {
+        SWSS_LOG_WARN("VNET tunnel route %s exists", ipPrefix.to_string().c_str());
+        return true;
+    }
+
     VNetOrch* vnet_orch = gDirectory.get<VNetOrch*>();
     for (auto peer : peer_list)
     {
@@ -1097,6 +1103,12 @@ bool VNetBitmapObject::addRoute(IpPrefix& ipPrefix, nextHop& nh)
     Port port;
     RouteInfo routeInfo;
 
+    if (routeMap_.find(ipPrefix) != routeMap_.end())
+    {
+        SWSS_LOG_WARN("VNET route %s exists", ipPrefix.to_string().c_str());
+        return true;
+    }
+
     bool is_subnet = (!nh.ips.getSize() || nh.ips.contains("0.0.0.0")) ? true : false;
 
     if (is_subnet && (!gPortsOrch->getPort(nh.ifname, port) || (port.m_rif_id == SAI_NULL_OBJECT_ID)))