3Com Switch 7750 Configuration Guide

220 CHAPTER 27: DLDP CONFIGURATION
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■ When you use the dldp enable/dldp disable command in system view to
enable/disable DLDP globally on all optical ports of the switch, this command is
only valid for existing optical ports on the device, however, it is not valid for
those added subsequently.
■ DLDP can operate normally only when the same authentication mode and
password are set for local and peer ports.
■ When the DLDP protocol works in normal mode, the system can identify only
one type of unidirectional links: cross-connected fibers.
■ When the DLDP protocol works in enhanced mode, the system can identify
two types of unidirectional links: the first type is the cross-connected fiber, and
the second type is one of the two fibers is not connected or fails.
■ When the device is busy with services and the CPU utilization is high, DLDP may
issue mistaken reports. You are recommended to configure the operating
mode of DLDP as manual after unidirectional links are discovered.
■ For the dldp interval integer command, make sure that the same interval for
transmitting advertisement packets is set on the ports used to connected both
devices; otherwise DLDP will not operate properly.
Resetting DLDP Status
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Only after the ports are DLDP down due to the detection of unidirectional links
can you use the dldp reset command to reset the DLDP status of these ports to
retrieve DLDP probes.
Force the duplex attribute duplex full Required
If you want
to use
DLDP to
detect
which fiber
of the two
fibers is not
connected
or fails, you
must
configure
the ports to
work in the
mandatory
full duplex
mode.
Force the speed value speed speed-value Required
Display the configuration information about the
DLDP-enabled ports
display dldp
[ interface-type
interface-number ]
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Table 150 DLDP configuration tasks
Operation Command
Descriptio
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