diff --git a/neutron/agent/linux/ip_lib.py b/neutron/agent/linux/ip_lib.py
index 04e66bddea1..f0f59124a40 100644
--- a/neutron/agent/linux/ip_lib.py
+++ b/neutron/agent/linux/ip_lib.py
@@ -1544,8 +1544,10 @@ def list_ip_routes(namespace, ip_version, scope=None, via=None, table=None,
             return get_attr(device, 'IFLA_IFNAME')
 
     def get_proto(proto_number):
-        if proto_number in rtnl.rt_proto:
+        if isinstance(proto_number, int) and proto_number in rtnl.rt_proto:
             return rtnl.rt_proto[proto_number]
+        elif isinstance(proto_number, str) and proto_number.isnumeric():
+            return rtnl.rt_proto[int(proto_number)]
         elif str(proto_number) in constants.IP_PROTOCOL_NUM_TO_NAME_MAP:
             return constants.IP_PROTOCOL_NUM_TO_NAME_MAP[str(proto_number)]
 
diff --git a/neutron/privileged/agent/linux/ip_lib.py b/neutron/privileged/agent/linux/ip_lib.py
index f444f9a15b0..7ad3af03349 100644
--- a/neutron/privileged/agent/linux/ip_lib.py
+++ b/neutron/privileged/agent/linux/ip_lib.py
@@ -717,6 +717,8 @@ def _make_pyroute2_route_args(namespace, ip_version, cidr, device, via, table,
     if metric:
         args['priority'] = int(metric)
     if protocol:
+        if isinstance(protocol, str) and protocol in rtnl.rt_proto:
+            protocol = rtnl.rt_proto[protocol]
         args['proto'] = protocol
     if isinstance(via, (list, tuple)):
         args['multipath'] = []