Zuld Status - ZyXEL Communications GS2210 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 (Aggresssive 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 Application > Errdiable > Errdisable Recovery and set the interval for ZULD. After
the interval expires, the closed port(s) 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.

37.2 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 225 Advanced Application > ZULD Status
The following table describes the labels in this screen.
Table 158 Advanced Application > ZULD Status
LABEL
ZULD is....
Port
Active
Chapter 37 ZULD
DESCRIPTION
This shows whether ZULD is enabled or disabled on the Switch.
This field displays the port number of the Switch.
This field displays whether ZULD is enabled on the port or not. ZULD must be enabled to
detect an unidirectional link by monitoring OAMPDUs.
GS2210 Series User's Guide
327