diff --git a/neutron/api/rpc/handlers/l3_rpc.py b/neutron/api/rpc/handlers/l3_rpc.py
index 01fd187bbc6..a57a0701b34 100644
--- a/neutron/api/rpc/handlers/l3_rpc.py
+++ b/neutron/api/rpc/handlers/l3_rpc.py
@@ -116,12 +116,19 @@ class L3RpcCallback(object):
         router_ids = kwargs.get('router_ids')
         host = kwargs.get('host')
         context = neutron_context.get_admin_context()
+        LOG.debug('Sync routers for ids %(router_ids)s in %(host)s',
+                  {'router_ids': router_ids,
+                   'host': host})
         routers = self._routers_to_sync(context, router_ids, host)
         if utils.is_extension_supported(
             self.plugin, constants.PORT_BINDING_EXT_ALIAS):
             self._ensure_host_set_on_ports(context, host, routers)
             # refresh the data structure after ports are bound
             routers = self._routers_to_sync(context, router_ids, host)
+        LOG.debug('The sync data for ids %(router_ids)s in %(host)s is: '
+                  '%(routers)s', {'router_ids': router_ids,
+                                  'host': host,
+                                  'routers': routers})
         return routers
 
     def _routers_to_sync(self, context, router_ids, host=None):
diff --git a/neutron/db/l3_dvrscheduler_db.py b/neutron/db/l3_dvrscheduler_db.py
index f4d09f8d16d..4cdeda2bea4 100644
--- a/neutron/db/l3_dvrscheduler_db.py
+++ b/neutron/db/l3_dvrscheduler_db.py
@@ -21,6 +21,7 @@ from neutron_lib import constants as n_const
 from neutron_lib.plugins import constants as plugin_constants
 from neutron_lib.plugins import directory
 from oslo_config import cfg
+from oslo_log import helpers as log_helpers
 from oslo_log import log as logging
 from sqlalchemy import or_
 
@@ -398,6 +399,9 @@ class L3_DVRsch_db_mixin(l3agent_sch_db.L3AgentSchedulerDbMixin):
         result_set = set(super(L3_DVRsch_db_mixin,
                             self)._get_router_ids_for_agent(
             context, agent_db, router_ids))
+        LOG.debug("Routers %(router_ids)s bound to L3 agent in host %(host)s",
+                  {'router_ids': result_set,
+                   'host': agent_db['host']})
         router_ids = set(router_ids or [])
         if router_ids and result_set == router_ids:
             # no need for extra dvr checks if requested routers are
@@ -424,13 +428,21 @@ class L3_DVRsch_db_mixin(l3agent_sch_db.L3AgentSchedulerDbMixin):
                                     list(subnet_ids))):
                         result_set.add(router_id)
 
+            LOG.debug("Routers %(router_ids)s are scheduled or have "
+                      "serviceable ports in host %(host)s",
+                      {'router_ids': result_set,
+                       'host': agent_db['host']})
             for dvr_router in dvr_routers:
                 result_set |= set(
                     self._get_other_dvr_router_ids_connected_router(
                         context, dvr_router))
 
+        LOG.debug("Router IDs %(router_ids)s for agent in host %(host)s",
+                  {'router_ids': result_set,
+                   'host': agent_db['host']})
         return list(result_set)
 
+    @log_helpers.log_method_call
     def _check_dvr_serviceable_ports_on_host(self, context, host, subnet_ids):
         """Check for existence of dvr serviceable ports on host