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Quidway S5700 Series Ethernet Switches
Configuration Guide - Device Management
Influence of the ALS Function on Link Data Communication Recovery
When ALS is disabled, the optical module laser of the switch is still working. After the fiber
link is recovered, the LOS is cleared and the interface becomes Up rapidly. When ALS is enabled,
the switch controls the laser by detecting the LOS on the interface. This delays the recovery of
data communication on the link.
l
l
After ALS is enabled on an interface, the communication recovery speed on the interface is
reduced. Packets are discarded if traffic is transmitted on the interface.
9.3 Configuring ALS
Configuring ALS of the laser of an optical module in the interface view provides security
protection and saves energy.
9.3.1 Establishing the Configuration Task
Before configuring ALS, familiarize yourself with the applicable environment, complete the
pre-configuration tasks, and obtain the required data. This helps you complete the configuration
task quickly and accurately.
Issue 01 (2011-07-15)
ALS is enabled on both ends of the fiber link.
As shown in
Figure
9-1, two switches are connected through the fiber. The interfaces of
the two switches are enabled with ALS and work in automatic restart mode. After the fiber
link is recovered, the process for interfaces of Switch A and Switch B changing from Down
to Up is as follows:
1.
Switch A sends pulses periodically.
2.
Switch B receives pulses of Switch A after the fiber link is recovered.
3.
The LOS on the interface of Switch B is cleared, and the interface becomes Up and
sends signals.
4.
Switch A receives signals of Switch B.
5.
The LOS on the interface of Switch A is cleared, the interface becomes Up, and data
communication is recovered.
ALS is enabled on one end of the fiber link.
As shown in
Figure
9-1, two switches are connected through the fiber. ALS is disabled on
the interface of Switch A and enabled on the interface of Switch B, and the interface work
in automatic restart mode. After the fiber link is recovered, the process for interfaces of
Switch A and Switch B changing from Down to Up is as follows:
1.
The optical module laser of Switch A is still working.
2.
Switch B receives optical signals of Switch A immediately after the fiber link is
recovered.
3.
The LOS on the interface of Switch B is cleared, and the interface becomes Up and
sends signals.
4.
Switch A receives signals of Switch B.
5.
The LOS on the interface of Switch A is cleared, the interface becomes Up, and data
communication is recovered.
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9 ALS Configuration
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