QTECH QSW-3400 Инструкция по настройке - Manual (Page 85)

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84
Ethernet1/1 need to be shutted down!
%Oct 29 11:09:50 2007 Unidirectional port Ethernet1/1 shut down!
%Oct 29 11:09:50 2007 A unidirectional link is detected! Port
Ethernet1/2 need to be shutted down!
%Oct 29 11:09:50 2007 Unidirectional port Ethernet1/2 shutted down!
Port g1/3, and port g1/4 of SWITCH B are all shut down by ULDP, and
there is notification information on the CRT terminal of PC2.
%Oct 29 11:09:50 2007 A unidirectional link is detected! Port
Ethernet1/3 need to be shutted down!
%Oct 29 11:09:50 2007 Unidirectional port Ethernet1/3 shutted down!
%Oct 29 11:09:50 2007 A unidirectional link is detected! Port
Ethernet1/4 need to be shutted down!
%Oct 29 11:09:50 2007 Unidirectional port Ethernet1/4 shutted down!
8.4 ULDP Troubleshooting
Configuration Notice:

In order to ensure that ULDP can discover that the one of fiber ports has not connected
or the ports are incorrectly cross connected, the ports have to work in duplex mode and
have the same rate.

If the automatic negotiation mechanism of the fiber ports with one port misconnected
decides the working mode and rate of the ports, ULDP won’t take effect no matter
enabled or not.
In such situation, the port is considered as “Down”.

In order to make sure that neighbors can be correctly created and unidirectional links
can be correctly discovered, it is required that both end of the link should enable ULDP,
using the same authentication method and password. At present, no password is
needed on both ends.

The hello interval of sending hello messages can be changed (it is10 seconds by
default and ranges from 5 to 100 seconds) so that ULDP can respond faster to
connection errors of links in different network environments. But this interval should be
less than 1/3 of the STP convergence time. If the interval is too long, a STP loop will be
generated before ULDP discovers and shuts down the unidirectional connection port. If
the interval is too short, the network burden on the port will be increased, which means
a reduced bandwidth.

ULDP does not handle any LACP event. It treats every link of TRUNK group (like Port-
channel, TRUNK ports) as independent, and handles each of them respectively.