H3C S12500R Series Quick guide

H3C S12500R Switch Router Series
DLDP Configuration Examples
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The information in this document is subject to change without notice.

i
Contents
Introduction····································································································1
Configuration restrictions and guidelines·······················································1
Prerequisites··································································································1
Example: Configuring the auto port shutdown mode······································1
Network configuration ········································································································································1
Software versions used······································································································································2
Procedures·························································································································································2
Verifying the configuration··································································································································2
Configuration files ··············································································································································6
Example: Configuring the manual port shutdown mode·································6
Network configuration ········································································································································6
Software versions used······································································································································7
Procedures·························································································································································7
Verifying the configuration··································································································································7
Configuration files ············································································································································11
Example: Configuring the hybrid port shutdown mode·································12
Network configuration ······································································································································12
Software versions used····································································································································12
Procedures·······················································································································································12
Verifying the configuration································································································································13
Configuration files ············································································································································17
Related documentation················································································17

1
Introduction
This document provides DLDP configuration examples.
The Device Link Detection Protocol (DLDP) was developed by HP to detect the status of fiber links
or twisted-pair links. When DLDP detects unidirectional links, it can automatically shut down the
faulty port to avoid network problems. Alternatively, a user can manually shut down the faulty port.
Configuration restrictions and guidelines
When you configure DLDP, follow these restrictions and guidelines:
•
For DLDP to operate correctly, configure the full duplex mode for the interfaces at the two
ends of the link, and configure the same speed for the two interfaces.
•
For DLDP to operate correctly, enable DLDP on both sides and make sure the following
settings are consistent:
Interval to send Advertisement packets.
DLDP authentication mode.
Password.
•
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.
Prerequisites
The configuration examples in this document were created and verified in a lab environment, and
all the devices were started with the factory default configuration. When you are working on a live
network, make sure you understand the potential impact of every command on your network.
This document assumes that you have basic knowledge of DLDP.
Example: Configuring the auto port
shutdown mode
Network configuration
As shown in Figure 1, Device Aand Device B are connected through two fiber pairs.
Configure DLDP on the devices so each device performs the following tasks:
•
Detects unidirectional links caused by cross-connected fibers or a disconnected fiber.
•
Automatically shuts down the faulty interface when detecting a unidirectional link.
•
Automatically brings up the interface after the administrator clears the fault.

2
Figure 1 Network diagram
Software versions used
This configuration example was created and verified on Release 3606.
Procedures
1. Configure Device A:
# Enable DLDP globally.
<DeviceA> system-view
[DeviceA] dldp global enable
# Configure HundredGigE 1/0/1 and HundredGigE 1/0/2 to operate in full duplex mode at
10000 Mbps, and enable DLDP on the interfaces.
[DeviceA] interface hundredgige 1/0/1
[DeviceA-HundredGigE1/0/1] duplex full
[DeviceA-HundredGigE1/0/1] speed 10000
[DeviceA-HundredGigE1/0/1] dldp enable
[DeviceA-HundredGigE1/0/1] quit
[DeviceA] interface hundredgige 1/0/2
[DeviceA-HundredGigE1/0/2] duplex full
[DeviceA-HundredGigE1/0/2] speed 10000
[DeviceA-HundredGigE1/0/2] dldp enable
[DeviceA-HundredGigE1/0/2] quit
# Set the interval for sending Advertisement packets to 5 seconds (default interval).
[DeviceA] dldp interval 5
# Configure the plain text authentication mode and set the password to abc.
[DeviceA] dldp authentication-mode simple
[DeviceA] dldp authentication-password simple abc
# Set the interface shutdown mode to auto (default mode).
[DeviceA] dldp unidirectional-shutdown auto
2. Configure Device B in the same way Device A is configured. (Details not shown.)
Verifying the configuration
# Display global and interface-specific DLDP configuration for Device A.
[DeviceA] display dldp
DLDP global status: Enabled
DLDP advertisement interval: 5s
DLDP authentication-mode: Simple
HGE1/0/1 HGE1/0/1
HGE1/0/2 HGE1/0/2
Ethernet
fiber port Fiber link
Device A Device B
Tx end Rx end

3
DLDP authentication-password: ******
DLDP unidirectional-shutdown mode: Auto
DLDP delaydown-timer value: 1s
Number of enabled ports: 2
Interface HundredGigE1/0/1
DLDP port state: Bidirectional
DLDP port unidirectional-shutdown mode: None
DLDP initial-unidirectional-delay: 100s
Number of the port’s neighbors: 1
Neighbor MAC address: 0023-8956-3600
Neighbor port index: 1
Neighbor state: Confirmed
Neighbor aged time: 11s
Neighbor echo time: -
Interface HundredGigE1/0/2
DLDP port state: Bidirectional
DLDP port unidirectional-shutdown mode: None
DLDP initial-unidirectional-delay: 100s
Number of the port’s neighbors: 1
Neighbor MAC address: 0023-8956-3600
Neighbor port index: 2
Neighbor state: Confirmed
Neighbor aged time: 12s
Neighbor echo time: -
The output shows that the DLDP port status of both HundredGigE 1/0/1 and HundredGigE 1/0/2 is
Bidirectional.
# Enable the monitoring of logs on the current terminal for Device A, and set the lowest level of the
logs that can be output to the monitor terminal to 6.
[DeviceA] quit
<DeviceA> terminal monitor
The current terminal is enabled to display logs.
<DeviceA> terminal logging level 6
As shown in Figure 2, the two pairs of fibers between Device A and Device B are cross-connected.
Figure 2 Cross-connected fibers
The following log information is displayed on Device A:
<DeviceA>%Jul 11 17:40:31:089 2018 DeviceA IFNET/3/PHY_UPDOWN: Physical state on the
interface HundredGigE1/0/1 changed to down.
%Jul 11 17:40:31:091 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/1 changed to down.
HGE1/0/1 HGE1/0/1
HGE1/0/2 HGE1/0/2
Device A Device B

4
%Jul 11 17:40:31:677 2018 DeviceA IFNET/3/PHY_UPDOWN: Physical state on the interface
HundredGigE1/0/2 changed to down.
%Jul 11 17:40:31:678 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/2 changed to down.
%Jul 11 17:40:38:544 2018 DeviceA IFNET/3/PHY_UPDOWN: Physical state on the interface
HundredGigE1/0/1 changed to up.
%Jul 11 17:40:38:836 2018 DeviceA IFNET/3/PHY_UPDOWN: Physical state on the interface
HundredGigE1/0/2 changed to up.
The output shows that the physical status of both HundredGigE 1/0/1 and HundredGigE 1/0/2 is
down and then up. The link status of both interfaces is down.
# Display information about interface HundredGigE 1/0/1 on Device A.
[DeviceA]display interface hundredgige 1/0/1
HundredGigE1/0/1
Current state: UP
Line protocol state: DOWN(DLDP)
Description: HundredGigE1/0/1 Interface
Bandwidth: 10000000kbps
Media type is optical fiber, Port hardware type is 10G_BASE_SR_SFP
Maximum frame length: 9216
Allow jumbo frame to pass
Broadcast max-ratio: 100%
Multicast max-ratio: 100%
Unicast max-ratio: 100%
IP packet frame type: Ethernet II, hardware address: 00e0-fc00-5929
Flow-control is not enabled
Loopback is not set
10Gbps-speed mode, full-duplex mode
Link speed type is force link, link duplex type is force link
PVID: 1
Mdi type: automdix
Port link-type: Access
Tagged Vlan: none
UnTagged Vlan: 1
Port priority: 0
Last link flapping: 0 hours 11 minutes 9 seconds
Last clearing of counters: Never
Peak input rate: 141 bytes/sec, at 2018-01-01 01:37:08
Peak output rate: 84 bytes/sec, at 2018-01-01 05:39:56
Last 300 second input: 0 packets/sec 99 bytes/sec 0%
Last 300 second output: 0 packets/sec 63 bytes/sec 0%
Input (total): 26470 packets, 2469445 bytes
0 unicasts, 1 broadcasts, 26469 multicasts, 0 pauses
Input (normal): 26470 packets, - bytes
0 unicasts, 1 broadcasts, 26469 multicasts, 0 pauses
Input: 0 input errors, 0 runts, 0 giants, 0 throttles
0 CRC, 0 frame, - overruns, 0 aborts
- ignored, - parity errors
Output (total): 16962 packets, 1165236 bytes
0 unicasts, 0 broadcasts, 16962 multicasts, 0 pauses

5
Output (normal): 16962 packets, - bytes
0 unicasts, 0 broadcasts, 16962 multicasts, 0 pauses
Output: 0 output errors, - underruns, - buffer failures
0 aborts, 0 deferred, 0 collisions, 0 late collisions
0 lost carrier, - no carrier
The output shows that the physical status of HundredGigE 1/0/1 is up, but DLDP automatically
shuts down the interface. The output for interface HundredGigE 1/0/2 is similar to HundredGigE
1/0/1. (Details not shown.)
# Display global and interface-specific DLDP configuration for Device A.
<DeviceA> display dldp
DLDP global status: Enabled
DLDP advertisement interval: 5s
DLDP authentication-mode: Simple
DLDP authentication-password: ******
DLDP unidirectional-shutdown mode: Auto
DLDP delaydown-timer value: 1s
Number of enabled ports: 2
Interface HundredGigE1/0/1
DLDP port state: Unidirectional
DLDP port unidirectional-shutdown mode: None
DLDP initial-unidirectional-delay: 0s
Number of the port’s neighbors: 0 (Maximum number ever detected: 1)
Interface HundredGigE1/0/2
DLDP port state: Unidirectional
DLDP port unidirectional-shutdown mode: None
DLDP initial-unidirectional-delay: 0s
Number of the port’s neighbors: 0 (Maximum number ever detected: 1)
The output shows that the DLDP port status of both HundredGigE 1/0/1 and HundredGigE 1/0/2 is
Unidirectional. DLDP has detected a unidirectional link on both interfaces.
# 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 2018 DeviceA IFNET/3/PHY_UPDOWN: Physical state on the
interface HundredGigE1/0/1 changed to down.
%Jul 11 17:42:58:603 2018 DeviceA IFNET/3/PHY_UPDOWN: Physical state on the interface
HundredGigE1/0/2 changed to down.
%Jul 11 17:43:02:342 2018 DeviceA IFNET/3/PHY_UPDOWN: Physical state on the interface
HundredGigE1/0/1 changed to up.
%Jul 11 17:43:02:343 2018 DeviceA DLDP/6/DLDP_NEIGHBOR_CONFIRMED: A neighbor was
confirmed on interface HundredGigE1/0/1. The neighbor's system MAC is 0023-8956-3600,
and the port index is 1.
%Jul 11 17:43:02:344 2018 DeviceA DLDP/6/DLDP_LINK_BIDIRECTIONAL: DLDP detected a
bidirectional link on interface HundredGigE1/0/1.
%Jul 11 17:43:02:353 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/1 changed to up.
%Jul 11 17:43:02:357 2018 DeviceA IFNET/3/PHY_UPDOWN: Physical state on the interface
HundredGigE1/0/2 changed to up.

6
%Jul 11 17:43:02:362 2018 DeviceA DLDP/6/DLDP_NEIGHBOR_CONFIRMED: A neighbor was
confirmed on interface HundredGigE1/0/2. The neighbor's system MAC is 0023-8956-3600,
and the port index is 2.
%Jul 11 17:43:02:362 2018 DeviceA DLDP/6/DLDP_LINK_BIDIRECTIONAL: DLDP detected a
bidirectional link on interface HundredGigE1/0/2.
%Jul 11 17:43:02:368 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/2 changed to up.
The output shows that the physical status and link status of both HundredGigE 1/0/1 and
HundredGigE 1/0/2 are up and their DLDP neighbors are determined. The links become
bidirectional.
Configuration files
•
Device A:
#
dldp global enable
dldp authentication-mode simple
dldp authentication-password cipher $c$3$wHDzwD/AZNW+q+otXapfZ/tUB/Wgbg==
#
interface HundredGigE1/0/1
speed 10000
duplex full
dldp enable
#
interface HundredGigE1/0/2
speed 10000
duplex full
dldp enable
#
•
The configuration file for Device B is the same as Device A. (Details not shown.)
Example: Configuring the manual port
shutdown mode
Network configuration
As shown in Figure 3, Device A and Device B are connected through two fiber pairs.
Configure DLDP on the devices to meet the following requirements:
•
Each device can detect unidirectional links caused by cross-connected fibers or a
disconnected fiber.
•
When a unidirectional link is detected, the administrator can manually shut down the faulty
port based on the connection status of the link.
•
The interface recovers from failure after the administrator clears the fault and manually brings
up the port.

7
Figure 3 Network diagram
Software versions used
This configuration example was created and verified on Release 3606.
Procedures
1. Configure Device A:
# Enable DLDP globally.
<DeviceA> system-view
[DeviceA] dldp global enable
# Configure HundredGigE 1/0/1 and HundredGigE 1/0/2 to operate in full duplex mode at
10000 Mbps, and enable DLDP on the interfaces.
[DeviceA] interface hundredgige 1/0/1
[DeviceA-HundredGigE1/0/1] duplex full
[DeviceA-HundredGigE1/0/1] speed 10000
[DeviceA-HundredGigE1/0/1] dldp enable
[DeviceA-HundredGigE1/0/1] quit
[DeviceA] interface hundredgige 1/0/2
[DeviceA-HundredGigE1/0/2] duplex full
[DeviceA-HundredGigE1/0/2] speed 10000
[DeviceA-HundredGigE1/0/2] dldp enable
[DeviceA-HundredGigE1/0/2] quit
# Set the interval for sending Advertisement packets to 5 seconds (default interval).
[DeviceA] dldp interval 5
# Configure the plain text authentication mode and set the password to abc.
[DeviceA] dldp authentication-mode simple
[DeviceA] dldp authentication-password simple abc
# Set the interface shutdown mode to manual.
[DeviceA] dldp unidirectional-shutdown manual
2. Configure Device B in the same way Device A is configured. (Details not shown.)
Verifying the configuration
# Display global and interface-specific DLDP configuration for Device A.
[DeviceA] display dldp
DLDP global status: Enabled
DLDP advertisement interval: 5s
DLDP authentication-mode: Simple
HGE1/0/1 HGE1/0/1
HGE1/0/2 HGE1/0/2
Ethernet
fiber port Fiber link
Device A Device B
Tx end Rx end

8
DLDP authentication-password: ******
DLDP unidirectional-shutdown mode: Manual
DLDP delaydown-timer value: 1s
Number of enabled ports: 2
Interface HundredGigE1/0/1
DLDP port state: Bidirectional
DLDP port unidirectional-shutdown mode: None
DLDP initial-unidirectional-delay: 100s
Number of the port’s neighbors: 1
Neighbor MAC address: 0023-8956-3600
Neighbor port index: 1
Neighbor state: Confirmed
Neighbor aged time: 11s
Neighbor echo time: -
Interface HundredGigE1/0/2
DLDP port state: Bidirectional
DLDP port unidirectional-shutdown mode: None
DLDP initial-unidirectional-delay: 100s
Number of the port’s neighbors: 1
Neighbor MAC address: 0023-8956-3600
Neighbor port index: 2
Neighbor state: Confirmed
Neighbor aged time: 12s
Neighbor echo time: -
The output shows that the DLDP port status of both HundredGigE 1/0/1 and HundredGigE 1/0/2 is
Bidirectional.
# Enable the monitoring of logs on the current terminal for Device A, and set the lowest level of the
logs that can be output to the monitor terminal to 6.
[DeviceA] quit
<DeviceA> terminal monitor
The current terminal is enabled to display logs.
<DeviceA> terminal logging level 6
As shown in Figure 4, the two pairs of fibers between Device A and Device B are cross-connected.
Figure 4 Cross-connected fibers
The following log information is displayed on Device A:
<DeviceA>%Jul 12 08:29:17:786 2018 DeviceA IFNET/3/PHY_UPDOWN: Physical state on the
interface HundredGigE1/0/1 changed to down.
%Jul 12 08:29:17:787 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/1 changed to down.
HGE1/0/1 HGE1/0/1
HGE1/0/2 HGE1/0/2
Device A Device B

9
%Jul 12 08:29:17:800 2018 DeviceA IFNET/3/PHY_UPDOWN: Physical state on the interface
HundredGigE1/0/2 changed to down.
%Jul 12 08:29:17:800 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/2 changed to down.
%Jul 12 08:29:25:004 2018 DeviceA IFNET/3/PHY_UPDOWN: Physical state on the interface
HundredGigE1/0/1 changed to up.
%Jul 12 08:29:25:005 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/1 changed to up.
%Jul 12 08:29:25:893 2018 DeviceA IFNET/3/PHY_UPDOWN: Physical state on the interface
HundredGigE1/0/2 changed to up.
%Jul 12 08:29:25:894 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/2 changed to up.
The output shows that the physical status and link status of both HundredGigE 1/0/1 and
HundredGigE 1/0/2 are down and then up.
# Display information about interface HundredGigE 1/0/1 on Device A.
[DeviceA]display interface hundredgige 1/0/1
HundredGigE1/0/1
Current state: UP
Line protocol state: UP
Description: HundredGigE1/0/1 Interface
Bandwidth: 10000000kbps
Media type is optical fiber, Port hardware type is 10G_BASE_SR_SFP
Maximum frame length: 9216
Allow jumbo frame to pass
Broadcast max-ratio: 100%
Multicast max-ratio: 100%
Unicast max-ratio: 100%
IP packet frame type: Ethernet II, hardware address: 00e0-fc00-5929
Flow-control is not enabled
Loopback is not set
10Gbps-speed mode, full-duplex mode
Link speed type is force link, link duplex type is force link
PVID: 1
Mdi type: automdix
Port link-type: Access
Tagged Vlan: none
UnTagged Vlan: 1
Port priority: 0
Last link flapping: 0 hours 11 minutes 9 seconds
Last clearing of counters: Never
Peak input rate: 141 bytes/sec, at 2018-01-01 01:37:08
Peak output rate: 104 bytes/sec, at 2018-01-01 06:40:58
Last 300 second input: 0 packets/sec 27 bytes/sec 0%
Last 300 second output: 1 packets/sec 101 bytes/sec 0%
Input (total): 27226 packets, 2547709 bytes
0 unicasts, 1 broadcasts, 27225 multicasts, 0 pauses
Input (normal): 27226 packets, - bytes
0 unicasts, 1 broadcasts, 27225 multicasts, 0 pauses
Input: 0 input errors, 0 runts, 0 giants, 0 throttles

10
0 CRC, 0 frame, - overruns, 0 aborts
- ignored, - parity errors
Output (total): 17991 packets, 1260564 bytes
0 unicasts, 0 broadcasts, 17991 multicasts, 0 pauses
Output (normal): 17991 packets, - bytes
0 unicasts, 0 broadcasts, 17991 multicasts, 0 pauses
Output: 0 output errors, - underruns, - buffer failures
0 aborts, 0 deferred, 0 collisions, 0 late collisions
0 lost carrier, - no carrier
The output shows that the physical status and link status of HundredGigE 1/0/1 are up. DLDP does
not shut down the interface. The output for interface HundredGigE 1/0/2 is similar to HundredGigE
1/0/1. (Details not shown.)
# Display global and interface-specific DLDP configuration for Device A.
<DeviceA> display dldp
DLDP global status: Enabled
DLDP advertisement interval: 5s
DLDP authentication-mode: Simple
DLDP authentication-password: ******
DLDP unidirectional-shutdown mode: Manual
DLDP delaydown-timer value: 1s
Number of enabled ports: 2
Interface HundredGigE1/0/1
DLDP port state: Unidirectional
DLDP port unidirectional-shutdown mode: None
DLDP initial-unidirectional-delay: 0s
Number of the port’s neighbors: 0 (Maximum number ever detected: 1)
Interface HundredGigE1/0/2
DLDP port state: Unidirectional
DLDP port unidirectional-shutdown mode: None
DLDP initial-unidirectional-delay: 0s
Number of the port’s neighbors: 0 (Maximum number ever detected: 1)
The output shows that the DLDP port status of both HundredGigE 1/0/1 and HundredGigE 1/0/2 is
Unidirectional. DLDP has detected a unidirectional link on both interfaces but does not shut them
down.
# Shut down HundredGigE 1/0/1.
<DeviceA> system-view
[DeviceA] interface hundredgige 1/0/1
[DeviceA-HundredGigE1/0/1] shutdown
The following log information is displayed on Device A:
[DeviceA-HundredGigE1/0/1]%Jul 12 08:34:23:717 2018 DeviceA IFNET/3/PHY_UPDOWN:
Physical state on the interface HundredGigE1/0/1 changed to down.
%Jul 12 08:34:23:718 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/1 changed to down.
%Jul 12 08:34:23:778 2018 DeviceA IFNET/3/PHY_UPDOWN: Physical state on the interface
HundredGigE1/0/2 changed to down.

11
%Jul 12 08:34:23:779 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/2 changed to down.
The output shows that the physical status and link status of HundredGigE 1/0/1 and HundredGigE
1/0/2 are down.
# Shut down HundredGigE 1/0/2.
[DeviceA-HundredGigE1/0/1] quit
[DeviceA] interface hundredgige 1/0/2
[DeviceA-HundredGigE1/0/2] shutdown
# Correct the fiber connections, and bring up HundredGigE 1/0/2.
[DeviceA-HundredGigE1/0/2] undo shutdown
The following log information is displayed on Device A:
[DeviceA-HundredGigE1/0/2]%Jul 12 08:46:17:677 2018 DeviceA IFNET/3/PHY_UPDOWN:
Physical state on the interface HundredGigE1/0/2 changed to up.
%Jul 12 08:46:17:678 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/2 changed to up.
%Jul 12 08:46:17:959 2018 DeviceA DLDP/6/DLDP_NEIGHBOR_CONFIRMED: A neighbor was
confirmed on interface HundredGigE1/0/2. The neighbor's system MAC is 0023-8956-3600,
and the port index is 2.
%Jul 12 08:46:17:959 2018 DeviceA DLDP/6/DLDP_LINK_BIDIRECTIONAL: DLDP detected a
bidirectional link on interface HundredGigE1/0/2.
The output shows that the physical status and link status of HundredGigE 1/0/2 are up and its
DLDP neighbor is determined. The links become bidirectional.
# Bring up HundredGigE 1/0/1.
[DeviceA-HundredGigE1/0/2] quit
[DeviceA] interface hundredgige 1/0/1
[DeviceA-HundredGigE1/0/1] undo shutdown
The following log information is displayed on Device A:
[DeviceA-HundredGigE1/0/1]%Jul 12 08:48:25:952 2018 DeviceA IFNET/3/PHY_UPDOWN:
Physical state on the interface HundredGigE1/0/1 changed to up.
%Jul 12 08:48:25:952 2018 DeviceA DLDP/6/DLDP_NEIGHBOR_CONFIRMED: A neighbor was
confirmed on interface HundredGigE1/0/1. The neighbor's system MAC is 0023-8956-3600,
and the port index is 1.
%Jul 12 08:48:25:953 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/1 changed to up.
%Jul 12 08:48:25:953 2018 DeviceA DLDP/6/DLDP_LINK_BIDIRECTIONAL: DLDP detected a
bidirectional link on interface HundredGigE1/0/1.
The output shows that the physical status and link status of HundredGigE 1/0/1 are up and its
DLDP neighbor is determined. The links become bidirectional.
Configuration files
•
Device A:
#
dldp global enable
dldp authentication-mode simple
dldp authentication-password cipher $c$3$wHDzwD/AZNW+q+otXapfZ/tUB/Wgbg==
dldp unidirectional-shutdown manual
#

12
interface HundredGigE1/0/1
speed 10000
duplex full
dldp enable
#
interface HundredGigE1/0/2
speed 10000
duplex full
dldp enable
#
•
The configuration file for Device B is the same as Device A. (Details not shown.)
Example: Configuring the hybrid port
shutdown mode
Network configuration
As shown in Figure 5, Device A and Device B are connected through two fiber pairs.
Configure DLDP to detect unidirectional links. When a unidirectional link is detected, DLDP
automatically shuts down the unidirectional port. The administrator needs to bring up the port after
clearing the fault.
Figure 5 Network diagram
Software versions used
This configuration example was created and verified on Release 3606.
Procedures
1. Configure Device A:
# Enable DLDP globally.
<DeviceA> system-view
[DeviceA] dldp enable
# Configure HundredGigE 1/0/1 to operate in full duplex mode and at 10000 Mbps, and
enable DLDP on the port.
[DeviceA] interface hundredgige 1/0/1
[DeviceA-HundredGigE1/0/1] duplex full
[DeviceA-HundredGigE1/0/1] speed 10000
HGE1/0/1 HGE1/0/1
HGE1/0/2 HGE1/0/2
Ethernet
fiber port Fiber link
Device A Device B
Tx end Rx end

13
[DeviceA-HundredGigE1/0/1] dldp enable
[DeviceA-HundredGigE1/0/1] quit
# Configure HundredGigE 1/0/2 to operate in full duplex mode and at 10000 Mbps, and
enable DLDP on the port.
[DeviceA] interface hundredgige 1/0/2
[DeviceA-HundredGigE1/0/2] duplex full
[DeviceA-HundredGigE1/0/2] speed 10000
[DeviceA-HundredGigE1/0/2] dldp enable
[DeviceA-HundredGigE1/0/2] quit
# Set the interval for sending Advertisement packets to 5 seconds, configure the DLDP
authentication mode as simple, and configure the password for DLDP authentication as abc.
[DeviceA] dldp interval 5
[DeviceA] dldp authentication-mode simple
[DeviceA] dldp authentication-password simple abc
# Set the port shutdown mode to hybrid.
[DeviceA] dldp unidirectional-shutdown hybrid
2. Configure Device B in the same way Device A is configured.
Verifying the configuration
# Display global and interface-specific DLDP configuration on Device A.
[DeviceA] display dldp
DLDP global status: Enabled
DLDP advertisement interval: 5s
DLDP authentication-mode: Simple
DLDP authentication-password: ******
DLDP unidirectional-shutdown mode: Hybrid
DLDP delaydown-timer value: 1s
Number of enabled ports: 2
Interface HundredGigE1/0/1
DLDP port state: Bidirectional
DLDP port unidirectional-shutdown mode: None
DLDP initial-unidirectional-delay: 100s
Number of the port’s neighbors: 1
Neighbor MAC address: 0023-8956-3600
Neighbor port index: 1
Neighbor state: Confirmed
Neighbor aged time: 11s
Neighbor echo time: -
Interface HundredGigE1/0/2
DLDP port state: Bidirectional
DLDP port unidirectional-shutdown mode: None
DLDP initial-unidirectional-delay: 100s
Number of the port’s neighbors: 1
Neighbor MAC address: 0023-8956-3600
Neighbor port index: 2

14
Neighbor state: Confirmed
Neighbor aged time: 12s
Neighbor echo time: -
The output shows that both HundredGigE 1/0/1 and HundredGigE 1/0/2 are in bidirectional state,
which means both links 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
As shown in Figure 6, the two pairs of fibers between Device A and Device B are cross-connected..
Figure 6 Cross-connected fibers
The following log information is displayed on Device A:
<DeviceA>%Jan 4 07:16:06:556 2018 DeviceA DLDP/5/DLDP_NEIGHBOR_AGED: A neighbor on
interface
HundredGigE1/0/1 was deleted because the neighbor was aged. The neighbor's system MAC
is 0023-8956-3600, and the port index is 162.
%Jan 4 07:16:06:560 2018 DeviceA DLDP/5/DLDP_NEIGHBOR_AGED: A neighbor on interface
HundredGigE1/0/2 was deleted because the neighbor was aged. The neighbor's system MAC
is 0023-8956-3600, and the port index is 165.
%Jan 4 07:16:06:724 2018 DeviceA IFNET/3/PHY_UPDOWN: Physical state on the interface
HundredGigE1/0/1 changed to down.
%Jan 4 07:16:06:730 2018 DeviceA IFNET/3/PHY_UPDOWN: Physical state on the interface
HundredGigE1/0/2 changed to down.
%Jan 4 07:16:06:736 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/1 changed to down.
%Jan 4 07:16:06:738 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/2 changed to down.
%Jan 4 07:16:07:152 2018 DeviceA DLDP/3/DLDP_LINK_UNIDIRECTIONAL: DLDP detected a
unidirectional link on interface HundredGigE1/0/1. DLDP automatically shut down the
interface. Please manually bring up the interface.
%Jan 4 07:16:07:156 2018 DeviceA DLDP/3/DLDP_LINK_UNIDIRECTIONAL: DLDP detected a
unidirectional link on interface HundredGigE1/0/2. DLDP automatically shut down the
interface. Please manually bring up the interface.
The output shows that the port status and link status of both HundredGigE 1/0/1 and HundredGigE
1/0/2 are down.
# Display information about interface HundredGigE 1/0/1 on Device A.
[DeviceA]display interface hundredgige 1/0/1
HundredGigE1/0/1
Current state: DOWN
Line protocol state: DOWN(DLDP)
Description: HundredGigE1/0/1 Interface
Bandwidth: 10000000kbps
HGE1/0/1 HGE1/0/1
HGE1/0/2 HGE1/0/2
Device A Device B

15
Media type is optical fiber, Port hardware type is 10G_BASE_SR_SFP
Maximum frame length: 9216
Allow jumbo frame to pass
Broadcast max-ratio: 100%
Multicast max-ratio: 100%
Unicast max-ratio: 100%
IP packet frame type: Ethernet II, hardware address: 00e0-fc00-5929
Flow-control is not enabled
Loopback is not set
10Gbps-speed mode, full-duplex mode
Link speed type is force link, link duplex type is force link
PVID: 1
Mdi type: automdix
Port link-type: Access
Tagged Vlan: none
UnTagged Vlan: 1
Port priority: 0
Last link flapping: 0 hours 11 minutes 9 seconds
Last clearing of counters: Never
Peak input rate: 141 bytes/sec, at 2018-01-01 01:37:08
Peak output rate: 84 bytes/sec, at 2018-01-01 05:39:56
Last 300 second input: 0 packets/sec 99 bytes/sec 0%
Last 300 second output: 0 packets/sec 63 bytes/sec 0%
Input (total): 26470 packets, 2469445 bytes
0 unicasts, 1 broadcasts, 26469 multicasts, 0 pauses
Input (normal): 26470 packets, - bytes
0 unicasts, 1 broadcasts, 26469 multicasts, 0 pauses
Input: 0 input errors, 0 runts, 0 giants, 0 throttles
0 CRC, 0 frame, - overruns, 0 aborts
- ignored, - parity errors
Output (total): 16962 packets, 1165236 bytes
0 unicasts, 0 broadcasts, 16962 multicasts, 0 pauses
Output (normal): 16962 packets, - bytes
0 unicasts, 0 broadcasts, 16962 multicasts, 0 pauses
Output: 0 output errors, - underruns, - buffer failures
0 aborts, 0 deferred, 0 collisions, 0 late collisions
0 lost carrier, - no carrier
The output shows that the physical status and link status of HundredGigE 1/0/1 are down. The
output for interface HundredGigE 1/0/2 is similar to HundredGigE 1/0/1. (Details not shown.)
# Display global and interface-specific DLDP configuration on Device A.
<DeviceA> display dldp
DLDP global status: Enabled
DLDP advertisement interval: 5s
DLDP authentication-mode: Simple
DLDP authentication-password: ******
DLDP unidirectional-shutdown mode: Hybrid
DLDP delaydown-timer value: 1s
Number of enabled ports: 2

16
Interface HundredGigE1/0/1
DLDP port state: Unidirectional
DLDP port unidirectional-shutdown mode: None
DLDP initial-unidirectional-delay: 0s
Number of the port’s neighbors: 0 (Maximum number ever detected: 1)
Interface HundredGigE1/0/2
DLDP port state: Unidirectional
DLDP port unidirectional-shutdown mode: None
DLDP initial-unidirectional-delay: 0s
Number of the port’s neighbors: 0 (Maximum number ever detected: 1)
The output shows that the DLDP port status of both HundredGigE 1/0/1 and HundredGigE 1/0/2 is
Unidirectional. DLDP has detected a unidirectional link on both interfaces.
# Correct the fiber connections, and bring up HundredGigE 1/0/1.
<DeviceA> system-view
[DeviceA] interface hundredgige 1/0/1
[DeviceA-HundredGigE1/0/1] undo shutdown
The following log information is displayed on Device A:
[DeviceA-HundredGigE1/0/1]%Jan 4 07:33:26:574 2018 DeviceA IFNET/3/PHY_UPDOWN:
Physical state on the interface HundredGigE1/0/1 changed to up.
%Jan 4 07:33:57:562 2018 DeviceA DLDP/6/DLDP_NEIGHBOR_CONFIRMED: A neighbor was
confirmed on interface HundredGigE1/0/1. The neighbor's system MAC is 0023-8956-3600,
and the port index is 162.
%Jan 4 07:33:57:563 2018 DeviceA DLDP/6/DLDP_LINK_BIDIRECTIONAL: DLDP detected a
bidirectional link on interface HundredGigE1/0/1.
%Jan 4 07:33:57:590 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/1 changed to up.
%Jan 4 07:33:57:609 2018 DeviceA STP/6/STP_DETECTED_TC: Instance 0's port
HundredGigE1/0/1 detected a topology change.
The output shows that the port status and link status of HundredGigE 1/0/1 are now up and its
DLDP neighbors are determined. The links become bidirectional.
# Bring up HundredGigE 1/0/2.
[DeviceA-HundredGigE1/0/1] quit
[DeviceA] interface hundredgige 1/0/2
[DeviceA-HundredGigE1/0/2] undo shutdown
The following log information is displayed on Device A:
[DeviceA-HundredGigE1/0/2]%Jan 4 07:35:26:574 2018 DeviceA IFNET/3/PHY_UPDOWN:
Physical state on the interface HundredGigE1/0/2 changed to up.
%Jan 4 07:35:57:562 2018 DeviceA DLDP/6/DLDP_NEIGHBOR_CONFIRMED: A neighbor was
confirmed on interface HundredGigE1/0/2. The neighbor's system MAC is 0023-8956-3600,
and the port index is 162.
%Jan 4 07:35:57:563 2018 DeviceA DLDP/6/DLDP_LINK_BIDIRECTIONAL: DLDP detected a
bidirectional link on interface HundredGigE1/0/2.
%Jan 4 07:35:57:590 2018 DeviceA IFNET/5/LINK_UPDOWN: Line protocol state on the
interface HundredGigE1/0/2 changed to up.
%Jan 4 07:35:57:609 2018 DeviceA STP/6/STP_DETECTED_TC: Instance 0's port
HundredGigE1/0/2 detected a topology change.

17
The output shows that the port status and link status of HundredGigE 1/0/2 are now up and its
DLDP neighbors are determined. The links become bidirectional.
Configuration files
•
Device A:
#
dldp global enable
dldp authentication-mode simple
dldp authentication-password cipher $c$3$wHDzwD/AZNW+q+otXapfZ/tUB/Wgbg==
dldp unidirectional-shutdown hybrid
#
interface HundredGigE1/0/1
speed 10000
duplex full
dldp enable
#
interface HundredGigE1/0/2
speed 10000
duplex full
dldp enable
#
•
The configuration file for Device B is the same as Device A. (Details not shown.)
Related documentation
•
H3C S12500R Switch Router Series High Availability Command Reference-R3606
•
H3C S12500R Switch Router Series High Availability Configuration Guide-R3606