Zuld Status - ZyXEL Communications XGS4600 Series User Manual

• Ports advertise their unidirectional link detection capability using OAMPDUs, so all connected devices
must support OAM as well as ZULD. You need to enable OAM on the Switch by going to Advanced
Application > OAM > Configuration and selecting Active. OAM must be enabled on other connected
devices too. If OAM is not enabled initially, ZULD will not work.
• If OAM is enabled initially and later disabled on one end of a link, the link will be unidirectional as that
end cannot send OAMPDUs.
• OAM discovery, the sending of OAMPDUs to other ports, is initiated by an active port.
• When ZULD detects a unidirectional link, it sends a syslog and SNMP trap and may shut down the
affected port (Aggressive Mode).
• If a port on the Switch is shut down by ZULD, and you want to recover it, then do one of the following:
• Go to Basic Setting > Port Setup. Clear Active and click Apply. Then select Active and click Apply
again.
• Go to Advanced Application > Errdisable > Errdisable Recovery and set the interval for ZULD. After
the interval expires, the closed ports will become active and start receiving packets again.
• Use the command port no inactive.
• Refer to the ZULD logs to see when a unidirectional link is detected and when it is recovered to a
bidirectional link.

44.2 ZULD Status

Use this screen to see details of unidirectional and bidirectional links discovered by ZULD. To open this
screen, click Advanced Application > ZULD.
Figure 339 Advanced Application > ZULD Status (Standalone Mode)
Chapter 44 ZULD
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