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Chapter 40 ZULD
XGS2220 Series User’s Guide
296
Figure 221 PORT > ZULD > ZULD Status (Stacking Mode)
The following table describes the fields in the above screen.
Table 137 PORT > ZULD > ZULD Status
LABEL DESCRIPTION
ZULD is.... This shows whether ZULD is enabled or disabled on the Switch.
SLOT This field appears only in Stacking mode. Click the drop-down list to choose the slot
number of the Switch in a stack.
Port This field displays the port number. In Stacking mode, the first number represents the slot ID
and the second is the port number. Please note that the default stacking ports (the last
four ports of your Switch) cannot be configured. They are reserved for stacking only.
Active This field displays whether ZULD is enabled on the port or not. ZULD must be enabled to
detect an unidirectional link by monitoring OAMPDUs.
Mode This field indicates what ZULD will do when a unidirectional link is detected. In Normal
mode, ZULD only sends a syslog and trap when it detects a unidirectional link. In
Aggressive mode, ZULD shuts down the port (puts it into an ErrDisable state) as well as
sends a syslog and trap when it detects a unidirectional link.
Probe Time Probe time is the length of time that ZULD waits before declaring that a link is
unidirectional. When the probe time expires, and one port (either on the Switch or the
connected device) still has not received an OAMPDU, then ZULD declares that the link is
unidirectional.
Link State This field shows the following link states:
• Linkdown: This is an initialization state, where the port is not yet up.
• Probe: This indicates that ZULD is discovering the connected device on this link.
• Bidirectional: Traffic sent by the Switch is received by the connected device on this
link, and traffic from the connected device on this link is received by the Switch.
• Unidirectional: The state of the link between the port and its connected port cannot
be determined either because no ZULD message was received, or one port is not
capable of sending traffic.
• Shutdown: The port has been shut down because its link with the connected device is
unidirectional and ZULD is in Aggressive mode.
Remote Operation This field displays whether ZULD is enabled or disabled on the connected device on this
link. ZULD must be enabled on the connected device and on the port that is connecting
to the Switch.
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