Configuring DLDP CHAPTERS. 1. Overview 2. DLDP Configuration 3. Appendix: Default Parameters

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1 CHAPTERS 1. Overview Appendix: Default Parameters

2 Overview This guide applies to: T1500G-10PS v2 or above, T1500G-8T v2 or above, T1500G-10MPS v2 or above, T PCT v3 or above, T1600G-52TS v3 or above, T1600G-52PS v3 or above, T1600G-28PS v3 or above, T1600G-28TS v3 or above, T1600G-18TS v2 or above, T2600G-52TS v3 or above, T2600G-28TS v3 or above, T2600G-28MPS v3 or above, T2600G-28SQ v1 or above. 1 Overview DLDP (Device Link Detection Protocol) is a Layer 2 protocol that enables devices connected through fiber or twisted-pair Ethernet cables to detect whether a unidirectional link exists. A unidirectional link occurs whenever traffic sent by a local device is received by its peer device but traffic from the peer device is not received by the local device. Unidirectional links can cause a variety of problems, such as spanning-tree topology loops. Once detecting a unidirectional link, DLDP can shut down the related port automatically or inform users. Configuration Guide 1

2 Configuration Guidelines A DLDP-capable port cannot detect a unidirectional link if it is connected to a DLDPincapable port of another switch.

3 2 Configuration Guidelines A DLDP-capable port cannot detect a unidirectional link if it is connected to a DLDPincapable port of another switch. To detect unidirectional links, make sure DLDP is enabled on both sides of the links. 2.1 Using the GUI Choose the menu MAINTENANCE > DLDP to load the following page. Figure 2-1 Configure DLDP Follow these steps to configure DLDP: 1) In the Global Config section, enable DLDP and configure the relevant parameters. Click Apply. Configuration Guide 2

4 DLDP State Advertisement Interval Shut Mode Enable or disable DLDP globally. Configure the interval to send advertisement packets. Valid values are from 1 to 30 seconds, and the default value is 5 seconds. Choose how to shut down the port when a unidirectional link is detected: Auto: When a unidirectional link is detected on a port, DLDP will generate logs and traps then shut down the port, and DLDP on this port will change to Disabled. Manual: When a unidirectional link is detected on a port, DLDP will generate logs and traps, and then users can manually shut down the unidirectional link ports. Auto Refresh Refresh Interval With this option enabled, the switch will automatically refresh the DLDP information. Specify the time interval at which the switch will refresh the DLDP information. Valid values are from 1 to 100 seconds, and the default value is 3 seconds. 2) In the Port Config section, select one or more ports, enable DLDP and click Apply. Then you can view the relevant DLDP information in the table. DLDP Protocol State Enable or disable DLDP on the port. Displays the DLDP protocol state. Initial: DLDP is disabled. Inactive: DLDP is enabled but the link is down. Active: DLDP is enabled and the link is up, or the neighbor entries in this device are empty. Advertisement: No unidirectional link is detected (the device has established bidirectional links with all its neighbors) or DLDP has remained in an Active status for more than 5 seconds. Probe: In this state, the device will send out Probe packets to detect whether the link is unidirectional. The port enters this state from the Active state if it receives a packet from an unknown neighbor. Disable: A unidirectional link is detected. Link State Displays the link state. Link-Down: The link is down. Link-Up: The link is up. Neighbour State Displays the neighbour state. Unknown: Link detection is in progress. Unidirectional: The link between the port and the neighbor is unidirectional. Bidirectional: The link between the port and the neighbor is bidirectional. Configuration Guide 3

5 2.2 Using the CLI Follow these steps to configure DLDP: Step 1 configure Enter global configuration mode. Step 2 dldp Globally enable DLDP. Step 3 dldp interval interval-time Configure the interval of sending advertisement packets on ports that are in the advertisement state. interval-time: Specify the interval time. The valid values are from 1 to 30 seconds. By default, it is 5 seconds. Step 3 dldp shut-mode { auto manual } Configure the DLDP shutdown mode when a unidirectional link is detected. auto: The switch automatically shuts down ports when a unidirectional link is detected. It is the default setting. manual: The switch displays an alert when a unidirectional link is detected. Then the users can manually shut down the unidirectional link ports. Step 4 interface {fastethernet port range fastethernet port-list gigabitethernet port range gigabitethernet port-list ten-gigabitethernet port range ten-gigabitethernet port-list} Enter interface configuration mode. Step 5 dldp Enable DLDP on the specified port. Step 6 show dldp Verify the global DLDP configuration. Step 7 show dldp interface Verify the DLDP configuration of the ports. Step 8 end Return to privileged EXEC mode. Step 9 copy running-config startup-config Save the settings in the configuration file. The following example shows how to enable DLDP globally, configure the DLDP interval as 10 seconds and specify the shutdown mode as auto. Switch#configure Switch(config)#dldp Configuration Guide 4

6 Switch(config)#dldp interval 10 Switch(config)#dldp shut-mode auto Switch(config)#show dldp DLDP Global State: Enable DLDP Message Interval: 10 DLDP Shut Mode: Auto Switch(config)#end Switch#copy running-config startup-config The following example shows how to enable DLDP on port 1/0/1. Switch#configure Switch(config)#interface gigabitethernet 1/0/1 Switch(config-if)#dldp Switch(config-if)#show dldp interface Port DLDP State Protocol State Link State Neighbor State Gi1/0/1 Enable Inactive Link-Down N/A Gi1/0/2 Disable Initial Link-Down N/A... Switch(config-if)#end Switch#copy running-config startup-config Configuration Guide 5

7 Appendix: Default Parameters 3 Appendix: Default Parameters Default settings of DLDP are listed in the following table. Table 3-1 Parameter Default Settings of DLDP Default Setting Global Config DLDP State Advertisement Interval Shut Mode Auto Refresh Refresh Interval Disable 5 seconds Auto Disabled 3 seconds Port Config DLDP Disabled Configuration Guide 6

Mirroring Traffic CHAPTERS. 1. Mirroring 2. Configuration Examples 3. Appendix: Default Parameters

Mirroring Traffic CHAPTERS. 1. Mirroring 2. Configuration Examples 3. Appendix: Default Parameters Mirroring Traffic CHAPTERS 1. Mirroring 2. Configuration Examples 3. Appendix: Default Parameters This guide applies to: T1500G-8T v2 or above, T1500G-10PS v2 or above, T1500G-10MPS v2 or above, T1500-28PCT