Zuld Status - ZyXEL Communications XGS2220 Series User Manual

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.

39.2 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 189 PORT > ZULD > ZULD Status
The following table describes the fields in the above screen.
Table 130 PORT > ZULD > ZULD Status
LABEL
ZULD is....
Port
Active
Chapter 39 ZULD
DESCRIPTION
This shows whether ZULD is enabled or disabled on the Switch.
This field displays the port number.
This field displays whether ZULD is enabled on the port or not. ZULD must be enabled to
detect an unidirectional link by monitoring OAMPDUs.
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