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+# Copyright (c) 2016 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Interface util library"""
+
+from resources.libraries.python.ssh import exec_cmd_no_error
+from resources.libraries.python.topology import NodeType, Topology
+from resources.libraries.python.VatExecutor import VatExecutor
+
+
+class InterfaceUtil(object):
+ """General utilities for managing interfaces"""
+
+ @staticmethod
+ def set_interface_state(node, interface, state):
+ """Set interface state on a node.
+
+ Function can be used for DUTs as well as for TGs.
+
+ :param node: node where the interface is
+ :param interface: interface name
+ :param state: one of 'up' or 'down'
+ :type node: dict
+ :type interface: str
+ :type state: str
+ :return: nothing
+ """
+ if node['type'] == NodeType.DUT:
+ if state == 'up':
+ state = 'admin-up link-up'
+ elif state == 'down':
+ state = 'admin-down link-down'
+ else:
+ raise Exception('Unexpected interface state: {}'.format(state))
+
+ sw_if_index = Topology.get_interface_sw_index(node, interface)
+ VatExecutor.cmd_from_template(node, 'set_if_state.vat',
+ sw_if_index=sw_if_index, state=state)
+
+ elif node['type'] == NodeType.TG:
+ cmd = 'ip link set {} {}'.format(interface, state)
+ exec_cmd_no_error(node, cmd, sudo=True)
+ else:
+ raise Exception('Unknown NodeType: "{}"'.format(node['type']))