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Raisecom
ISCOM2600G-HI (A) Series Configuration Guide
11.4 UDLD
11.4.1 Introduction
UniDirectional Link Detection (UDLD) is used to monitor configurations of the physical
connection by the fiber or Ethernet cable. When a unidirectional link (transmitting data in
only one direction) is present, UDLD can detect it, shut down the corresponding interface, and
send a Trap. The unidirectional link may cause various problems, such as the spanning tree
problems which may cause a loop.
11.4.2 Preparing for configurations
Scenario
When a unidirectional link (transmitting data in only one direction) is present, UDLD can
detect the fault, shut down the corresponding interface, and send a Trap.
Prerequisite
Devices at both ends of the link should support UDLD.
11.4.3 Default configurations of UDLD
Default configurations of UDLD are as below.
UDLD
11.4.4 Configuring UDLD
Configure UDLD for the ISCOM2600G-HI series switch as below.
Step
1
2
3
11.4.5 Checking configurations
Use the following commands to check configuration results.
Function
Command
Raisecom#config
Raisecom(config)#interface
interface-type primary-interface-
number
Raisecom(config)#uldp enable
Raisecom(config-
gigaethernet1/1/port) #uldp enable
Raisecom(config)#uldp recovery-
time
time
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Copyright © Raisecom Technology Co., Ltd.
Default value
Disable
Description
Enter global configuration mode
or interface configuration mode.
Enable global UDLD or interface
UDLD.
(Optional) configure the recovery
time for the unidirectional link.
11 Reliability
474
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