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Chapter 40 ZULD
XGS2220 Series User’s Guide
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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 PORT > Port Setup. Clear Active and click Apply. Then select Active and click Apply again.
•Go to SECURITY > 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.
40.2 ZULD Status
Use this screen to see details of unidirectional and bidirectional links discovered by ZULD. To open this
screen, click PORT > ZULD > ZULD Status.
Figure 220 PORT > ZULD > ZULD Status (Standalone Mode)
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