Restrictions for Configuring UniDirectional Link Detection
The following are restrictions for configuring UniDirectional Link Detection (UDLD):
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A UDLD-capable port can’t detect a unidirectional link if it’s connected to a UDLD-incapable port of another device.
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When configuring the mode (normal or aggressive), make sure that the same mode is configured on both sides of the link.
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In the initial phase, the number of ports on which Fast UDLD can be enabled is limited to 32. If this number is reached, then Fast UDLD isn’t enabled on additional ports and an error message is printed on the console:
UDLD: hundredGigE <> not enabled for fast hello, maximum number of fast hello ports (4) reached
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If you disable UDLD when Fast UDLD is configured, the entire UDLD configuration is removed.
Caution |
Loop guard works only on point-to-point links. We recommend that each end of the link has a directly connected device that is running STP. |