SNR S2940-8G-v2, Configuration Manual

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SNR S2940-8G-v2 Switch Configuration Guide
ULDP Function Configuration
6.4 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.
• ULDP does not compact with similar protocols of other vendors, which means users can not
use ULDP on one end and use other similar protocols on the other end.
• ULDP function is disabled by default. After globally enabling ULDP function, the debug
switch can be enabled simultaneously to check the debug information. There are several
DEBUG commands provided to print debug information, such as information of events, state
machine, errors and messages. Different types of message information can also be printed
according to different parameters.
• The Recovery timer is disabled by default and will only be enabled when the users have
configured recovery time (30-86400 seconds).
• Reset command and reset mechanism can only reset the ports automatically shut down by
ULDP. The ports shut down manually by users or by other modules won't be reset by ULDP.
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