H3C S12500 Series Quick guide

H3C S12500 DLDP Configuration Examples
Copyright © 2013 Hangzhou H3C Technologies Co., Ltd. All rights reserved.
No part of this manual may be reproduced or transmitted in any form or by any means
without prior written consent of Hangzhou H3C Technologies Co., Ltd.
The information in this document is subject to change without notice.

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Contents
Introduction··································································································································································· 1
Prerequisites·································································································································································· 1
Example: Automatically shutting down unidirectional links······················································································ 1
Network requirements ······················································································································································1
Software version used ······················································································································································2
Configuration restrictions and guidelines·······················································································································2
Configuration procedures ················································································································································2
Configuring Device A ··············································································································································2
Configuring Device B···············································································································································3
Verifying the configuration···············································································································································3
Configuration files·····························································································································································5
Example: Manually shutting down unidirectional links ····························································································· 6
Network requirements ······················································································································································6
Requirements analysis·······················································································································································7
Software version used ······················································································································································7
Configuration restrictions and guidelines·······················································································································7
Configuration procedures ················································································································································8
Configuring Device A ··············································································································································8
Configuring Device B···············································································································································8
Verifying the configuration···············································································································································9
Configuration files·························································································································································· 11
Related documentation ··············································································································································12

1
Introduction
This document provides DLDP configuration examples.
DLDP provides the following functions:
•Monitor the link state of optical fibers or copper twisted pairs.
•Detect whether the link is correctly connected at the link layer and whether the two ends can
exchange packets correctly.
When DLDP detects a unidirectional link, it does one of the following to prevent network problems:
•Automatically shuts down the ports involved.
•Prompts you to shut down the ports (according to your port shutdown mode setting).
DLDP cooperates with physical layer protocols to monitor link status and avoid physical and logical
unidirectional links.
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 H3C DLDP.
Example: Automatically shutting down
unidirectional links
Network requirements
As shown in Figure 1, Device A and Device B are connected with 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.

2
Figure 1 Network diagram
Software version used
This configuration example was created and verified on S12500-CMW710-R7129.
Configuration restrictions and guidelines
When you configure DLDP to automatically shut down unidirectional links, follow these restrictions and
guidelines:
•DLDP is available only for Ethernet ports.
•Enable DLDP globally and on each port.
•Configure the full duplex mode for the ports at the two ends of the link, and configure the same
speed for the two ports.
•Before enabling DLDP, make sure optical fibers or copper twisted pairs are connected because
DLDP can detect unidirectional links only when all links are physically connected.
Configuration procedures
Configuring Device A
# Enable DLDP globally.
<DeviceA> system-view
[DeviceA] dldp global enable
Correct fiber connection
Ethernet
fiber port Fiber link
Cross-connected fibers
GE3/0/1
GE3/0/1
GE3/0/2
GE3/0/2
Device A
Device B
GE3/0/1
GE3/0/1
GE3/0/2
GE3/0/2
Device A
Device B
Tx end Rx end

3
# Configure GigabitEthernet 3/0/1 to operate in full duplex mode and at 1000 Mbps, and enable
DLDP on the port.
[DeviceA] interface gigabitethernet 3/0/1
[DeviceA-Gigabitethernet3/0/1] undo shutdown
[DeviceA-GigabitEthernet3/0/1] duplex full
[DeviceA-GigabitEthernet3/0/1] speed 1000
[DeviceA-GigabitEthernet3/0/1] dldp enable
[DeviceA-GigabitEthernet3/0/1] quit
# Configure GigabitEthernet 3/0/2 to operate in full duplex mode and at 1000 Mbps, and enable
DLDP on the port.
[DeviceA] interface gigabitethernet 3/0/2
[DeviceA-Gigabitethernet3/0/2] undo shutdown
[DeviceA-GigabitEthernet3/0/2] duplex full
[DeviceA-GigabitEthernet3/0/2] speed 1000
[DeviceA-GigabitEthernet3/0/2] dldp enable
[DeviceA-GigabitEthernet3/0/2] quit
Configuring Device B
# Enable DLDP globally.
<DeviceB> system-view
[DeviceB] dldp global enable
# Configure GigabitEthernet 3/0/1 to operate in full duplex mode and at 1000 Mbps, and enable
DLDP on it.
[DeviceB] interface gigabitethernet 3/0/1
[DeviceB-Gigabitethernet3/0/1] undo shutdown
[DeviceB-GigabitEthernet3/0/1] duplex full
[DeviceB-GigabitEthernet3/0/1] speed 1000
[DeviceB-GigabitEthernet3/0/1] dldp enable
[DeviceB-GigabitEthernet3/0/1] quit
# Configure GigabitEthernet 3/0/2 to operate in full duplex mode and at 1000 Mbps, and enable
DLDP on it.
[DeviceB] interface gigabitethernet 3/0/2
[DeviceB-Gigabitethernet3/0/2] undo shutdown
[DeviceB-GigabitEthernet3/0/2] duplex full
[DeviceB-GigabitEthernet3/0/2] speed 1000
[DeviceB-GigabitEthernet3/0/2] dldp enable
[DeviceB-GigabitEthernet3/0/2] quit
Verifying the configuration
After the configurations are complete, you can use the display dldp command to display the DLDP
configuration globally and on ports.
# Display the DLDP configuration globally and on all the DLDP-enabled ports of Device A.
[DeviceA] display dldp
DLDP global status: Enabled

4
DLDP advertisement interval: 5s
DLDP authentication-mode: None
DLDP unidirectional-shutdown mode: Auto
DLDP delaydown-timer value: 1s
Number of enabled ports: 2
Interface GigabitEthernet3/0/1
DLDP port state: Bidirectional
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 GigabitEthernet3/0/2
DLDP port state: Bidirectional
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 GigabitEthernet 3/0/1 and GigabitEthernet 3/0/2 are in Bidirectional
state, which means both links are bidirectional.
# Enable the monitoring of logs on the current terminal on Device A, and 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: GigabitEthernet3/0/1
link status is DOWN.
%Jul 11 17:40:31:091 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
GigabitEthernet3/0/1 is DOWN.
%Jul 11 17:40:31:677 2012 DeviceA IFNET/3/PHY_UPDOWN: GigabitEthernet3/0/2 link
status is DOWN.
%Jul 11 17:40:31:678 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
GigabitEthernet3/0/2 is DOWN.
%Jul 11 17:40:38:544 2012 DeviceA IFNET/3/PHY_UPDOWN: GigabitEthernet3/0/1 link
status is UP.
%Jul 11 17:40:38:836 2012 DeviceA IFNET/3/PHY_UPDOWN: GigabitEthernet3/0/2 link
status is UP.
The output shows that the port status of both GigabitEthernet 3/0/1 and GigabitEthernet 3/0/2 is
down and then up, but the link status of them 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

5
DLDP unidirectional-shutdown mode: Auto
DLDP delaydown-timer value: 1s
Number of enabled ports: 2
Interface GigabitEthernet3/0/1
DLDP port state: Unidirectional
Number of the port’s neighbors: 0 (Maximum number ever detected: 1)
Interface GigabitEthernet3/0/2
DLDP port state: Unidirectional
Number of the port’s neighbors: 0 (Maximum number ever detected: 1)
The output shows that the DLDP port status of both GigabitEthernet 3/0/1 and GigabitEthernet
3/0/2 is unidirectional. Unidirectional indicates that DLDP detects unidirectional links on them and
automatically shuts down the two ports.
# Remove the unidirectional condition.
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: GigabitEthernet3/0/1
link status is DOWN.
%Jul 11 17:42:58:603 2012 DeviceA IFNET/3/PHY_UPDOWN: GigabitEthernet3/0/2 link
status is DOWN.
%Jul 11 17:43:02:342 2012 DeviceA IFNET/3/PHY_UPDOWN: GigabitEthernet3/0/1 link
status is UP.
%Jul 11 17:43:02:343 2012 DeviceA DLDP/6/DLDP_NEIGHBOR_CONFIRMED: A neighbor was
confirmed on interface GigabitEthernet3/0/1. 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 GigabitEthernet3/0/1.
%Jul 11 17:43:02:353 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
GigabitEthernet3/0/1 is UP.
%Jul 11 17:43:02:357 2012 DeviceA IFNET/3/PHY_UPDOWN: GigabitEthernet3/0/2 link
status is UP.
%Jul 11 17:43:02:362 2012 DeviceA DLDP/6/DLDP_NEIGHBOR_CONFIRMED: A neighbor was
confirmed on interface GigabitEthernet3/0/2. 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 GigabitEthernet3/0/2.
%Jul 11 17:43:02:368 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
GigabitEthernet3/0/2 is UP.
The output shows that the port status and link status of both GigabitEthernet 3/0/1 and
GigabitEthernet 3/0/2 are now up and their DLDP neighbors are determined. Both links are
bidirectional.
Configuration files
•Device A:
#
dldp global enable

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#
interface GigabitEthernet3/0/1
port link-mode bridge
speed 1000
duplex full
dldp enable
#
interface GigabitEthernet3/0/2
port link-mode bridge
speed 1000
duplex full
dldp enable
#
•Device B:
#
dldp global enable
#
interface GigabitEthernet3/0/1
port link-mode bridge
speed 1000
duplex full
dldp enable
#
interface GigabitEthernet3/0/2
port link-mode bridge
speed 1000
duplex full
dldp enable
#
Example: Manually shutting down
unidirectional links
Network requirements
As shown in Figure 2, Device A and Device B are connected with two fiber pairs.
Configure DLDP to detect unidirectional links. When a unidirectional link is detected, the administrator
must manually shut down the port.

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Figure 2 Network diagram
Requirements analysis
To manually shut down the faulty port, set the port shutdown mode to manual. The default port
shutdown mode is auto.
Software version used
This configuration example was created and verified on S12500-CMW710-R7129.
Configuration restrictions and guidelines
When you configure DLDP to ask you to manually shut down unidirectional links, follow these
restrictions and guidelines:
•DLDP is available only for Ethernet ports.
•To correctly configure DLDP on the device, you must enable DLDP globally and on each port.
•For DLDP to operate correctly, configure the full duplex mode for the ports at the two ends of the
link, and configure the same speed for the two ports.
•DLDP can detect unidirectional links only after all links are physically connected. Before enabling
DLDP, make sure optical fibers or copper twisted pairs are connected.
Correct fiber connection
Ethernet
fiber port Fiber link
Cross-connected fibers
GE3/0/1
GE3/0/1
GE3/0/2
GE3/0/2
Device A
Device B
GE3/0/1
GE3/0/1
GE3/0/2
GE3/0/2
Device A
Device B
Tx end Rx end

8
Configuration procedures
Configuring Device A
# Enable DLDP globally.
<DeviceA> system-view
[DeviceA] dldp global enable
# Configure GigabitEthernet 3/0/1 to operate in full duplex mode and at 1000 Mbps, and enable
DLDP on the port.
[DeviceA] interface gigabitethernet 3/0/1
[DeviceA-GigabitEthernet3/0/1] undo shutdown
[DeviceA-GigabitEthernet3/0/1] duplex full
[DeviceA-GigabitEthernet3/0/1] speed 1000
[DeviceA-GigabitEthernet3/0/1] dldp enable
[DeviceA-GigabitEthernet3/0/1] quit
# Configure GigabitEthernet 3/0/2 to operate in full duplex mode and at 1000 Mbps, and enable
DLDP on the port.
[DeviceA] interface gigabitethernet 3/0/2
[DeviceA-GigabitEthernet3/0/2] undo shutdown
[DeviceA-GigabitEthernet3/0/2] duplex full
[DeviceA-GigabitEthernet3/0/2] speed 1000
[DeviceA-GigabitEthernet3/0/2] dldp enable
[DeviceA-GigabitEthernet3/0/2] quit
# Set the port shutdown mode to manual.
[DeviceA] dldp unidirectional-shutdown manual
Configuring Device B
# Enable DLDP globally.
<DeviceB> system-view
[DeviceB] dldp global enable
# Configure GigabitEthernet 3/0/1 to operate in full duplex mode and at 1000 Mbps, and enable
DLDP on it.
[DeviceB] interface gigabitethernet 3/0/1
[DeviceB-GigabitEthernet3/0/1] undo shutdown
[DeviceB-GigabitEthernet3/0/1] duplex full
[DeviceB-GigabitEthernet3/0/1] speed 1000
[DeviceB-GigabitEthernet3/0/1] dldp enable
[DeviceB-GigabitEthernet3/0/1] quit
# Configure GigabitEthernet 3/0/2 to operate in full duplex mode and at 1000 Mbps, and enable
DLDP on it.
[DeviceB] interface gigabitethernet 3/0/2
[DeviceB-GigabitEthernet3/0/2] undo shutdown
[DeviceB-GigabitEthernet3/0/2] duplex full
[DeviceB-GigabitEthernet3/0/2] speed 1000

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[DeviceB-GigabitEthernet3/0/2] dldp enable
[DeviceB-GigabitEthernet3/0/2] quit
# Set the port shutdown mode to manual.
[DeviceB] dldp unidirectional-shutdown manual
Verifying the configuration
After the configurations are complete, you can use the display dldp command to display the DLDP
configuration globally and on ports.
# 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: Manual
DLDP delaydown-timer value: 1s
Number of enabled ports: 2
Interface GigabitEthernet3/0/1
DLDP port state: Bidirectional
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 GigabitEthernet3/0/2
DLDP port state: Bidirectional
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 GigabitEthernet 3/0/1 and GigabitEthernet 3/0/2 are in Bidirectional
state, which means both links are bidirectional.
# Enable the monitoring of logs on the current terminal on Device A, and 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 12 08:29:17:786 2012 DeviceA IFNET/3/PHY_UPDOWN: GigabitEthernet3/0/1
link status is DOWN.
%Jul 12 08:29:17:787 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
GigabitEthernet3/0/1 is DOWN.

10
%Jul 12 08:29:17:800 2012 DeviceA IFNET/3/PHY_UPDOWN: GigabitEthernet3/0/2 link
status is DOWN.
%Jul 12 08:29:17:800 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
GigabitEthernet3/0/2 is DOWN.
%Jul 12 08:29:25:004 2012 DeviceA IFNET/3/PHY_UPDOWN: GigabitEthernet3/0/1 link
status is UP.
%Jul 12 08:29:25:005 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
GigabitEthernet3/0/1 is UP.
%Jul 12 08:29:25:893 2012 DeviceA IFNET/3/PHY_UPDOWN: GigabitEthernet3/0/2 link
status is UP.
%Jul 12 08:29:25:894 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
GigabitEthernet3/0/2 is UP.
The output shows that the port status of both GigabitEthernet 3/0/1 and GigabitEthernet 3/0/2 is
down and then up.
# 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: Manual
DLDP delaydown-timer value: 1s
Number of enabled ports: 2
Interface GigabitEthernet3/0/1
DLDP port state: Unidirectional
Number of the port’s neighbors: 0 (Maximum number ever detected: 1)
Interface GigabitEthernet3/0/2
DLDP port state: Unidirectional
Number of the port’s neighbors: 0 (Maximum number ever detected: 1)
The output shows that the DLDP port status of both GigabitEthernet 3/0/1 and GigabitEthernet
3/0/2 is unidirectional. Unidirectional indicates that DLDP detects unidirectional links on them but
does not shut down the two ports.
The unidirectional links are caused by cross-connected fibers. Manually shut down the two ports.
# Shut down GigabitEthernet 3/0/1.
<DeviceA> system-view
[DeviceA] interface gigabitethernet 3/0/1
[DeviceA-GigabitEthernet3/0/1] shutdown
The following log information is displayed on Device A:
[DeviceA-GigabitEthernet3/0/1]%Jul 12 08:34:23:717 2012 DeviceA IFNET/3/PHY_UPDOWN:
GigabitEthernet3/0/1 link status is DOWN.
%Jul 12 08:34:23:718 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
GigabitEthernet3/0/1 is DOWN.
%Jul 12 08:34:23:778 2012 DeviceA IFNET/3/PHY_UPDOWN: GigabitEthernet3/0/2 link
status is DOWN.
%Jul 12 08:34:23:779 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
GigabitEthernet3/0/2 is DOWN.

11
The output shows that the port status and link status of both GigabitEthernet 3/0/1 and
GigabitEthernet 3/0/2 are now down.
# Shut down GigabitEthernet 3/0/2.
[DeviceA-GigabitEthernet3/0/1] quit
[DeviceA] interface gigabitethernet 3/0/2
[DeviceA-GigabitEthernet3/0/2] shutdown
Correct the fiber connections and bring up the two ports:
# Bring up GigabitEthernet 3/0/2.
[DeviceA-GigabitEthernet3/0/2] undo shutdown
The following log information is displayed on Device A:
[DeviceA-GigabitEthernet3/0/2]%Jul 12 08:46:17:677 2012 DeviceA IFNET/3/PHY_UPDOWN:
GigabitEthernet3/0/2 link status is UP.
%Jul 12 08:46:17:678 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
GigabitEthernet3/0/2 is UP.
%Jul 12 08:46:17:959 2012 DeviceA DLDP/6/DLDP_NEIGHBOR_CONFIRMED: A neighbor was
confirmed on interface GigabitEthernet3/0/2. The neighbor's system MAC is 0023-8956-
3600, and the port index is 2.
%Jul 12 08:46:17:959 2012 DeviceA DLDP/6/DLDP_LINK_BIDIRECTIONAL: DLDP detected a
bidirectional link on interface GigabitEthernet3/0/2.
The output shows that the port status and link status of GigabitEthernet 3/0/2 are now up and its
DLDP neighbors are determined. The link is bidirectional.
# Bring up GigabitEthernet 3/0/1.
[DeviceA-GigabitEthernet3/0/2] quit
[DeviceA] interface gigabitethernet 3/0/1
[DeviceA-GigabitEthernet3/0/1] undo shutdown
The following log information is displayed on Device A:
[DeviceA-GigabitEthernet3/0/1]%Jul 12 08:48:25:952 2012 DeviceA IFNET/3/PHY_UPDOWN:
GigabitEthernet3/0/1 link status is UP.
%Jul 12 08:48:25:952 2012 DeviceA DLDP/6/DLDP_NEIGHBOR_CONFIRMED: A neighbor was
confirmed on interface GigabitEthernet3/0/1. The neighbor's system MAC is 0023-8956-
3600, and the port index is 1.
%Jul 12 08:48:25:953 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
GigabitEthernet3/0/1 is UP.
%Jul 12 08:48:25:953 2012 DeviceA DLDP/6/DLDP_LINK_BIDIRECTIONAL: DLDP detected a
bidirectional link on interface GigabitEthernet3/0/1.
The output shows that the port status and link status of GigabitEthernet 3/0/1 are now up and its
DLDP neighbors are determined. The link is bidirectional.
Configuration files
•Device A:
#
dldp global enable
dldp unidirectional-shutdown manual
#
interface GigabitEthernet3/0/1

12
port link-mode bridge
speed 1000
duplex full
dldp enable
#
interface GigabitEthernet3/0/2
port link-mode bridge
speed 1000
duplex full
dldp enable
#
•Device B:
#
dldp global enable
dldp unidirectional-shutdown manual
#
interface GigabitEthernet3/0/1
port link-mode bridge
speed 1000
duplex full
dldp enable
#
interface GigabitEthernet3/0/2
port link-mode bridge
speed 1000
duplex full
dldp enable
#
Related documentation
•H3C S12500 Routing Switch Series High Availability Configuration Guide
•H3C S12500 Routing Switch Series High Availability Command Reference