HP 5500 Ei 5500 Si Switch Series Configuration Guide

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 NOTE: 
•  The TST function takes effect only in CFD IEEE 802.1ag.  
•   To view the test result, use the  display cfd tst command on the target MEP.  
 
Displaying and maintaining CFD 
 
Task Command  Remarks 
Display CFD and AIS status.  display cfd status
 [ | { begin |  exclude | 
include  } regular-expression ]  Available in any view 
Display the CFD protocol version. display cfd version
 [ | { begin |  exclude | 
include  } regular-expression ]   Available in any view 
Display MD configuration...

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Task Command  Remarks 
Display the TST result on the 
specified MEP. display cfd tst
 [ service-instance  instance-id 
[ mep  mep-id  ] ] [ | { begin | exclude  | 
include  } regular-expression ]   Available in any view 
Clear the one-way DM result on the 
specified MEP. reset cfd dm one-way history
 
[ service-instance  instance-id [ mep 
mep-id  ] ]  Available in user view 
Clear the TST result on the 
specified MEP.  reset cfd tst
 [ service-instance  instance-id 
[ mep  mep-id  ] ]  Available in...

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Figure 8 Network diagram 
 
 
Configuration procedure 
1. Configure a VLAN and assign ports to it: 
On each device shown in  Figure 8, c
reate VLAN 100, and assign ports GigabitEthernet 1/0/1 
through GigabitEthernet 1/0/4 to VLAN 100. 
2.  Enable CFD: 
# Enable CFD on Device A. 
 system-view 
[DeviceA] cfd enable 
Enable CFD on Device B through De vice E using the same method.  
3. Configure service instances: 
# Create MD_A (level 5) on Device A, create  MA_A, which serves VLAN 100, in MD_A, and...

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[DeviceC] cfd ma MA_B md MD_B vlan 100 
[DeviceC] cfd service-instance 2 md MD_B ma MA_B 
4. Configure MEPs: 
# On Device A, configure a MEP list in service  instance 1. Create and enable inward-facing MEP 
1001 in service instance 1 on GigabitEthernet 1/0/1.  
[DeviceA] cfd meplist 1001 4002 5001 service-instance 1 
[DeviceA] interface gigabitethernet 1/0/1 
[DeviceA-GigabitEthernet1/0/1] cfd mep 1001 service-instance 1 inbound 
[DeviceA-GigabitEthernet1/0/1] cfd mep service-instance 1 mep 1001...

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[DeviceA-GigabitEthernet1/0/1] cfd cc service-instance 1 mep 1001 enable\
 
[DeviceA-GigabitEthernet1/0/1] quit 
# On Device B, enable the sending of CCM frames for MEP 2001 in service instance 2 on 
GigabitEthernet 1/0/3. 
[DeviceB] interface gigabitethernet 1/0/3 
[DeviceB-GigabitEthernet1/0/3] cfd cc service-instance 2 mep 2001 enable\
 
[DeviceB-GigabitEthernet1/0/3] quit 
# On Device D, enable the sending of CCM frames for MEP 4001 in service instance 2 on 
GigabitEthernet 1/0/1, and enable the...

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MAC Address               TTL     Last MAC         Relay Action 
0010-FC00-6515            63      0010-FC00-6512   Hit 
3. Verify the LM function: 
After the CC function obtains the status information of  the entire network, use the LM function to test 
the link status. For example: 
# 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-FC00-6514 
Far-end frame loss: 10    Near-end frame...

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Reply from 0010-FC00-6514: 5ms 
Average: 8ms 
Send DMMs: 5       Received: 5        Lost: 0 
 
Frame delay variation: 5ms  4ms  6ms  0ms  0ms 
Average: 3ms 
6. Verify the TST function: 
After the CC function obtains the status information  of the entire network, use the TST function to 
test the bit errors of a link. For example: 
# 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 
Info: TST...

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Configuring DLDP 
DLDP overview 
Background 
Unidirectional links occur when one end of a link can receive packets from the other end, but the other 
end cannot receive packets sent by the first end. Unidirectional links result in problems such as loops in 
an STP-enabled network. 
For example, the link between two switches, Switch A and Switch B, is a bidirectional link when they are 
connected via a fiber pair, with one fiber used for sending packets from A to B and the other for sending 
packets...

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performs operations such as identifying peer devices, detecting unidirectional links, and shutting down 
unreachable ports. The auto-negotiation mechanis m and DLDP work together to make sure that 
physical/logical unidirectional links are detected  and shut down, and to prevent failure of other 
protocols such as STP. If both ends of a link are operating normally at the physical layer, DLDP detects 
whether the link is correctly connect ed at the link layer and whether the two ends can exchange...

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DLDP timer Description 
Echo timer  This timer is set to 10 seconds. It is tr
iggered when a device transits to the Probe 
state or when an enhanced detect is la unched. When the Echo timer expires and 
no Echo packet has been received from a neighbor device, the state of the link is 
set to unidirectional and the device transits  to the Disable state. In this case, the 
device does the following: 
Sends Disable packets. 
Either prompts the user to shut down the po rt or shuts down the port...