Example: Configuring the auto port shutdown mode

As shown in Figure 10, Device A and Device B are connected through two fiber pairs.

Configure DLDP to automatically shut down the faulty port upon detecting a unidirectional link, and automatically bring up the port after you clear the fault.

	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 Device A:

   # Enable DLDP globally.

   <DeviceA> system-view
   [DeviceA] dldp global enable
   

   # Configure FortyGigE 1/0/1 to operate in full duplex mode and at 40000 Mbps, and enable DLDP on the port.

   [DeviceA] interface fortygige 1/0/1
   [DeviceA-FortyGigE1/0/1] duplex full
   [DeviceA-FortyGigE1/0/1] speed 40000
   [DeviceA-FortyGigE1/0/1] dldp enable
   [DeviceA-FortyGigE1/0/1] quit
   

   # Configure FortyGigE 1/0/2 to operate in full duplex mode and at 40000 Mbps, and enable DLDP on the port.

   [DeviceA] interface fortygige 1/0/2
   [DeviceA-FortyGigE1/0/2] duplex full
   [DeviceA-] speed 40000
   [DeviceA-FortyGigE1/0/2] dldp enable
   [DeviceA-FortyGigE1/0/2] quit
   

   # Set the global port shutdown mode to auto.

   [DeviceA] dldp unidirectional-shutdown auto
   

2. Configure Device B:

   # Enable DLDP globally.

   <DeviceB> system-view
   [DeviceB] dldp global enable
   

   # Configure FortyGigE 1/0/1 to operate in full duplex mode and at 40000 Mbps, and enable DLDP on it.

   [DeviceB] interface fortygige 1/0/1
   [DeviceB-FortyGigE1/0/1] duplex full
   [DeviceB-] speed 40000
   [DeviceB-FortyGigE1/0/1] dldp enable
   [DeviceB-FortyGigE1/0/1] quit
   

   # Configure to operate in full duplex mode and at 40000 Mbps, and enable DLDP on it.

   [DeviceB] interface fortygige 1/0/2
   [DeviceB-FortyGigE1/0/2] duplex full
   [DeviceB-FortyGigE1/0/2] speed 40000
   [DeviceB-FortyGigE1/0/2] dldp enable
   [DeviceB-FortyGigE1/0/2] quit
   

   # Set the global port shutdown mode to auto.

   [DeviceB] dldp unidirectional-shutdown auto
   

# Display the DLDP configuration globally and on all the DLDP-enabled ports of Device A.

[DeviceA] display dldp
 DLDP global status: Enabled
 DLDP advertisement interval: 5s
 DLDP authentication-mode: None
 DLDP unidirectional-shutdown mode: Auto
 DLDP delaydown-timer value: 1s
 Number of enabled ports: 2

Interface FortyGigE1/0/1
 DLDP port state: Bidirectional
 DLDP port unidirectional-shutdown mode: None
 Number of the port’s neighbors: 1
  Neighbor MAC address: 0023-8956-3600
  Neighbor port index: 1
  Neighbor state: Confirmed
  Neighbor aged time: 11s

Interface FortyGigE1/0/2
 DLDP port state: Bidirectional
 DLDP port unidirectional-shutdown mode: None
 Number of the port’s neighbors: 1
  Neighbor MAC address: 0023-8956-3600
  Neighbor port index: 2
  Neighbor state: Confirmed
  Neighbor aged time: 12s

The output shows that both FortyGigE 1/0/1 and FortyGigE 1/0/2 are bidirectional.

# Enable the monitoring of logs on the current terminal on Device A. Set the lowest level of the logs that can be output to the current terminal to 6.

[DeviceA] quit
<DeviceA> terminal monitor
<DeviceA> terminal logging level 6

The following log information is displayed on Device A:

<DeviceA>%Jul 11 17:40:31:089 2012 DeviceA IFNET/3/PHY_UPDOWN: FortyGigE1/0/1 link status is DOWN.
%Jul 11 17:40:31:091 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface  is DOWN. 
%Jul 11 17:40:31:677 2012 DeviceA IFNET/3/PHY_UPDOWN: FortyGigE1/0/2 link status is DOWN.
%Jul 11 17:40:31:678 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface FortyGigE1/0/2 is DOWN.
%Jul 11 17:40:38:544 2012 DeviceA IFNET/3/PHY_UPDOWN:  link status is UP.
%Jul 11 17:40:38:836 2012 DeviceA IFNET/3/PHY_UPDOWN: FortyGigE1/0/2 link status is UP.

The output shows the following:

• The port status of both and FortyGigE 1/0/2 is down and then up.

• The link status of both FortyGigE 1/0/1 and is always down.

# Display the DLDP configuration globally and of all the DLDP-enabled ports.

<DeviceA> display dldp
 DLDP global status: Enabled
 DLDP advertisement interval: 5s
 DLDP authentication-mode: None
 DLDP unidirectional-shutdown mode: Auto
 DLDP delaydown-timer value: 1s
 Number of enabled ports: 2

Interface FortyGigE1/0/1
 DLDP port state: Unidirectional
 DLDP port unidirectional-shutdown mode: None
 Number of the port’s neighbors: 0 (Maximum number ever detected: 1)

Interface FortyGigE1/0/2
 DLDP port state: Unidirectional
 DLDP port unidirectional-shutdown mode: None
 Number of the port’s neighbors: 0 (Maximum number ever detected: 1)

The output shows that the DLDP port status of both FortyGigE 1/0/1 and FortyGigE 1/0/2 is unidirectional. DLDP detects unidirectional links on them and automatically shuts down the two ports.

The unidirectional links are caused by cross-connected fibers. Correct the fiber connections. As a result, the ports shut down by DLDP automatically recover, and Device A displays the following log information:

<DeviceA>%Jul 11 17:42:57:709 2012 DeviceA IFNET/3/PHY_UPDOWN: FortyGigE1/0/1 link status is DOWN.
%Jul 11 17:42:58:603 2012 DeviceA IFNET/3/PHY_UPDOWN:  link status is DOWN.
%Jul 11 17:43:02:342 2012 DeviceA IFNET/3/PHY_UPDOWN: FortyGigE1/0/1 link status is UP.
%Jul 11 17:43:02:343 2012 DeviceA DLDP/6/DLDP_NEIGHBOR_CONFIRMED: A neighbor was confirmed on interface FortyGigE1/0/1. The neighbor's system MAC is 0023-8956-3600, and the port index is 1.
%Jul 11 17:43:02:344 2012 DeviceA DLDP/6/DLDP_LINK_BIDIRECTIONAL: DLDP detected a bidirectional link on interface FortyGigE1/0/1.
%Jul 11 17:43:02:353 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface FortyGigE1/0/1 is UP.
%Jul 11 17:43:02:357 2012 DeviceA IFNET/3/PHY_UPDOWN: FortyGigE1/0/2 link status is UP.
%Jul 11 17:43:02:362 2012 DeviceA DLDP/6/DLDP_NEIGHBOR_CONFIRMED: A neighbor was confirmed on interface . The neighbor's system MAC is 0023-8956-3600, and the port index is 2.
%Jul 11 17:43:02:362 2012 DeviceA DLDP/6/DLDP_LINK_BIDIRECTIONAL: DLDP detected a bidirectional link on interface .
%Jul 11 17:43:02:368 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface FortyGigE1/0/2 is UP.

The output shows that the port status and link status of both and FortyGigE 1/0/2 are now up and their DLDP neighbors are determined.