Chapter 40 ZULD
GS2220 Series User’s Guide
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• Ports advertise their unidirectional link detection capability using OAMPDUs, so all connected devices
must support O AM as well as ZULD. You need to enable OAM on the Switch by going to Adva nc e d
Applic a tio n > O AM > C o nfig ura tio n and selecting Ac tive . 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 (Ag g re ssive 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 Ba sic Se tting > Po rt Se tup. Clear Ac tive and click Apply. Then select Ac tive and click Apply
again.
•Go to Adva nc e d Applic a tio n > Errdisa ble > Errdisa ble Re c o ve ry 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 Sta tus
Use this screen to see details of unidirectional and bidirectional links discovered by ZULD. To open this
screen, click Adva nc e d Applic a tio n > ZULD.
Fig ure 268 Advanced Application > ZULD Status
The following table describes the fields in the above screen.
Table 182 Advanced Application > ZULD Status
LABEL DESC RIPTIO N
ZULD is.... This shows whether ZULD is enabled or disabled on the Switch.
Port This field displays the port number.
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.
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