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-rw-r--r--ryu/controller/network.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/ryu/controller/network.py b/ryu/controller/network.py
index ac247ffd..9b9baa4e 100644
--- a/ryu/controller/network.py
+++ b/ryu/controller/network.py
@@ -18,12 +18,14 @@ import collections
from ryu.base import app_manager
import ryu.exception as ryu_exc
-from ryu.app.rest_nw_id import NW_ID_UNKNOWN
from ryu.controller import event
from ryu.exception import NetworkNotFound, NetworkAlreadyExist
from ryu.exception import PortAlreadyExist, PortNotFound, PortUnknown
+NW_ID_UNKNOWN = '__NW_ID_UNKNOWN__'
+
+
class MacAddressAlreadyExist(ryu_exc.RyuException):
message = 'port (%(dpid)s, %(port)s) has already mac %(mac_address)s'