Example: Configuring CFD

As shown in Figure 5:

• The network comprises five devices and is divided into two MDs: MD_A (level 5) and MD_B (level 3). All ports belong to VLAN 100, and the MAs in the two MDs all serve VLAN 100. Assume that the MAC addresses of Device A through Device E are 0010-FC01-6511, 0010-FC02-6512, 0010-FC03-6513, 0010-FC04-6514, and 0010-FC05-6515, respectively.

• MD_A has three edge ports: FortyGigE 1/0/1 on Device A, FortyGigE 1/0/3 on Device D, and FortyGigE 1/0/4 on Device E. They are all inward-facing MEPs. MD_B has two edge ports: on Device B and FortyGigE 1/0/1 on Device D. They are both outward-facing MEPs.

• In MD_A, Device B is designed to have MIPs when its port is configured with low level MEPs. Port FortyGigE 1/0/3 is configured with MEPs of MD_B, and the MIPs of MD_A can be configured on this port. You must configure the MIP generation rule of MD_A as explicit.

• The MIPs of MD_B are designed on Device C, and are configured on all ports. You must configure the MIP generation rule as default.

• Configure CC to monitor the connectivity among all the MEPs in MD_A and MD_B. Configure LB to locate link faults, and use the AIS and EAIS functions to suppress the error alarms that are reported.

• After the status information of the entire network is obtained, use LT, LM, one-way DM, two-way DM, and TST to detect link faults.

	IMPORTANT: By default, interfaces on the device are disabled (in ADM or Administratively Down state). To have an interface operate, you must use the undo shutdown command to enable that interface.

1. Configure a VLAN and assign ports to it:

   On each device shown in Figure 5, create VLAN 100 and assign ports FortyGigE 1/0/1 through FortyGigE 1/0/4 to VLAN 100.

2. Enable CFD:

   # Enable CFD on Device A.

   <DeviceA> system-view
   [DeviceA] cfd enable
   

   # Configure Device B through Device E in the same way Device A is configured. (Details not shown.)

3. Configure service instances:

   # Create MD_A (level 5) on Device A, and create service instance 1 (in which the MA is identified by a VLAN and serves VLAN 100).

   [DeviceA] cfd md MD_A level 5
   [DeviceA] cfd service-instance 1 ma-id vlan-based md MD_A vlan 100
   

   # Configure Device E in the same way Device A is configured. (Details not shown.)

   # Create MD_A (level 5) on Device B, and create service instance 1 (in which the MA is identified by a VLAN and serves VLAN 100).

   [DeviceB] cfd md MD_A level 5
   [DeviceB] cfd service-instance 1 ma-id vlan-based md MD_A vlan 100
   

   # Create MD_B (level 3), and create service instance 2 (in which the MA is identified by a VLAN and serves VLAN 100).

   [DeviceB] cfd md MD_B level 3
   [DeviceB] cfd service-instance 2 ma-id vlan-based md MD_B vlan 100
   

   # Configure Device D in the same way Device B is configured. (Details not shown.)

   # Create MD_B (level 3) on Device C, and create service instance 2 (in which the MA is identified by a VLAN and serves VLAN 100).

   [DeviceC] cfd md MD_B level 3
   [DeviceC] cfd service-instance 2 ma-id vlan-based md MD_B vlan 100
   

4. Configure MEPs:

   # On Device A, configure a MEP list in service instance 1, and create inward-facing MEP 1001 in service instance 1 on FortyGigE 1/0/1.

   [DeviceA] cfd meplist 1001 4002 5001 service-instance 1
   [DeviceA] interface fortygige 1/0/1
   [DeviceA-FortyGigE1/0/1] cfd mep 1001 service-instance 1 inbound
   [DeviceA-FortyGigE1/0/1] quit
   

   # On Device B, configure a MEP list in service instances 1 and 2.

   [DeviceB] cfd meplist 1001 4002 5001 service-instance 1
   [DeviceB] cfd meplist 2001 4001 service-instance 2
   

   # Create outward-facing MEP 2001 in service instance 2 on FortyGigE 1/0/3.

   [DeviceB] interface fortygige 1/0/3
   [DeviceB-] cfd mep 2001 service-instance 2 outbound
   [DeviceB-FortyGigE1/0/3] quit
   

   # On Device D, configure a MEP list in service instances 1 and 2.

   [DeviceD] cfd meplist 1001 4002 5001 service-instance 1
   [DeviceD] cfd meplist 2001 4001 service-instance 2
   

   # Create outward-facing MEP 4001 in service instance 2 on FortyGigE 1/0/1.

   [DeviceD] interface 
   [DeviceD-FortyGigE1/0/1] cfd mep 4001 service-instance 2 outbound
   [DeviceD-FortyGigE1/0/1] quit
   

   # Create inward-facing MEP 4002 in service instance 1 on FortyGigE 1/0/3.

   [DeviceD] interface fortygige 1/0/3
   [DeviceD-FortyGigE1/0/3] cfd mep 4002 service-instance 1 inbound
   [DeviceD-FortyGigE1/0/3] quit
   

   # On Device E, configure a MEP list in service instance 1.

   [DeviceE] cfd meplist 1001 4002 5001 service-instance 1
   

   # Create inward-facing MEP 5001 in service instance 1 on FortyGigE 1/0/4.

   [DeviceE] interface fortygige 1/0/4
   [DeviceE-FortyGigE1/0/4] cfd mep 5001 service-instance 1 inbound
   [DeviceE-FortyGigE1/0/4] quit
   

5. Configure MIPs:

   # Configure the MIP generation rule in service instance 1 on Device B as explicit.

   [DeviceB] cfd mip-rule explicit service-instance 1
   

   # Configure the MIP generation rule in service instance 2 on Device C as default.

   [DeviceC] cfd mip-rule default service-instance 2
   

6. Configure CC:

   # On Device A, enable the sending of CCM frames for MEP 1001 in service instance 1 on .

   [DeviceA] interface fortygige 1/0/1
   [DeviceA-FortyGigE1/0/1] cfd cc service-instance 1 mep 1001 enable
   [DeviceA-FortyGigE1/0/1] quit
   

   # On Device B, enable the sending of CCM frames for MEP 2001 in service instance 2 on FortyGigE 1/0/3.

   [DeviceB] interface fortygige 1/0/3
   [DeviceB-FortyGigE1/0/3] cfd cc service-instance 2 mep 2001 enable
   [DeviceB-FortyGigE1/0/3] quit
   

   # On Device D, enable the sending of CCM frames for MEP 4001 in service instance 2 on FortyGigE 1/0/1.

   [DeviceD] interface fortygige 1/0/1
   [DeviceD-] cfd cc service-instance 2 mep 4001 enable
   [DeviceD-FortyGigE1/0/1] quit
   

   # Enable the sending of CCM frames for MEP 4002 in service instance 1 on FortyGigE 1/0/3.

   [DeviceD] interface fortygige 1/0/3
   [DeviceD-FortyGigE1/0/3] cfd cc service-instance 1 mep 4002 enable
   [DeviceD-FortyGigE1/0/3] quit
   

   # On Device E, enable the sending of CCM frames for MEP 5001 in service instance 1 on FortyGigE 1/0/4.

   [DeviceE] interface fortygige 1/0/4
   [DeviceE-FortyGigE1/0/4] cfd cc service-instance 1 mep 5001 enable
   [DeviceE-FortyGigE1/0/4] quit
   

7. Configure AIS:

   # Enable AIS on Device B. Configure the AIS frame transmission level as 5 and AIS frame transmission interval as 1 second in service instance 2.

   [DeviceB] cfd ais enable
   [DeviceB] cfd ais level 5 service-instance 2
   [DeviceB] cfd ais period 1 service-instance 2
   

8. Configure EAIS:

   # Enable port status-AIS collaboration on Device B.

   [DeviceB] cfd ais-track link-status global
   

   # On FortyGigE 1/0/3 of Device B, configure the EAIS frame transmission level as 5 and the EAIS frame transmission interval as 60 seconds. Specify the VLANs where the EAIS frames can be transmitted as VLAN 100.

   [DeviceB] interface fortygige 1/0/3
   [DeviceB-] cfd ais-track link-status level 5
   [DeviceB-FortyGigE1/0/3] cfd ais-track link-status period 60
   [DeviceB-FortyGigE1/0/3] cfd ais-track link-status vlan 100
   [DeviceB-FortyGigE1/0/3] quit
   

1. Verify the LB function when the CC function detects a link fault:

   # Enable LB on Device A to check the status of the link between MEP 1001 and MEP 5001 in service instance 1.

   [DeviceA] cfd loopback service-instance 1 mep 1001 target-mep 5001
   Loopback to MEP 5001 with the sequence number start from 1001-43404:
   Reply from 0010-fc05-6515: sequence number=1001-43404 time=5ms
   Reply from 0010-fc05-6515: sequence number=1001-43405 time=5ms
   Reply from 0010-fc05-6515: sequence number=1001-43406 time=5ms
   Reply from 0010-fc05-6515: sequence number=1001-43407 time=5ms
   Reply from 0010-fc05-6515: sequence number=1001-43408 time=5ms
   Sent: 5        Received: 5        Lost: 0
   

2. Verify the LT function after the CC function obtains the status information of the entire network:

   # Identify the path between MEP 1001 and MEP 5001 in service instance 1 on Device A.

   [DeviceA] cfd linktrace service-instance 1 mep 1001 target-mep 5001
   Linktrace to MEP 5001 with the sequence number 1001-43462:
   MAC address               TTL     Last MAC         Relay action
   0010-fc05-6515            63      0010-fc02-6512   Hit
   

3. Verify the LM function after the CC function obtains the status information of the entire network:

   # Test the frame loss from MEP 1001 to MEP 4002 in service instance 1 on Device A.

   [DeviceA] cfd slm service-instance 1 mep 1001 target-mep 4002
   Reply from 0010-fc04-6514
   Far-end frame loss: 10    Near-end frame loss: 20
   Reply from 0010-fc04-6514
   Far-end frame loss: 40    Near-end frame loss: 40
   Reply from 0010-fc04-6514
   Far-end frame loss: 0     Near-end frame loss: 10
   Reply from 0010-fc04-6514
   Far-end frame loss: 30    Near-end frame loss: 30
   
   Average
   Far-end frame loss: 20    Near-end frame loss: 25
   Far-end frame loss rate: 25.00%    Near-end frame loss rate: 32.00%
   Send LMMs: 5        Received: 5        Lost: 0
   

4. Verify the one-way DM function after the CC function obtains the status information of the entire network:

   # Test the one-way frame delay from MEP 1001 to MEP 4002 in service instance 1 on Device A.

   [DeviceA] cfd dm one-way service-instance 1 mep 1001 target-mep 4002
   5 1DMs have been sent. Please check the result on the remote device.
   

   # Display the one-way DM result on MEP 4002 in service instance 1 on Device D.

   [DeviceD] display cfd dm one-way history service-instance 1 mep 4002
   Service instance: 1
   MEP ID: 4002
   Sent 1DM total number: 0
   Received 1DM total number: 5
   Frame delay: 10ms 9ms 11ms 5ms 5ms
   Delay average: 8ms
   Delay variation: 5ms 4ms 6ms 0ms 0ms
   Variation average: 3ms
   

5. Verify the two-way DM function after the CC function obtains the status information of the entire network:

   # Test the two-way frame delay from MEP 1001 to MEP 4002 in service instance 1 on Device A.

   [DeviceA] cfd dm two-way service-instance 1 mep 1001 target-mep 4002
   Frame delay:
   Reply from 0010-fc04-6514: 2406us
   Reply from 0010-fc04-6514: 2215us
   Reply from 0010-fc04-6514: 2112us
   Reply from 0010-fc04-6514: 1812us
   Reply from 0010-fc04-6514: 2249us
   Average: 2158us
   Sent DMMs: 5        Received: 5        Lost: 0
   
   Frame delay variation: 191us 103us 300us 437us
   Average: 257us
   

6. Verify the TST function after the CC function obtains the status information of the entire network:

   # Test the bit errors on the link from MEP 1001 to MEP 4002 in service instance 1 on Device A.

   [DeviceA] cfd tst service-instance 1 mep 1001 target-mep 4002
   5 TSTs have been sent. Please check the result on the remote device.
   

   # Display the TST result on MEP 4002 in service instance 1 on Device D.

   [DeviceD] display cfd tst service-instance 1 mep 4002
   Service instance: 1
   MEP ID: 4002
   Sent TST total number: 0
   Received TST total number: 5
   Received from 0010-fc01-6511, Bit True,  sequence number 0
   Received from 0010-fc01-6511, Bit True,  sequence number 1
   Received from 0010-fc01-6511, Bit True,  sequence number 2
   Received from 0010-fc01-6511, Bit True,  sequence number 3
   Received from 0010-fc01-6511, Bit True,  sequence number 4