Table 165: UDLD Interface Configuration Fields (continued)
Field
Description
UDLD Mode
The UDLD mode for the port, which is one of the following:
•
Normal – The state of the port is classified as Undetermined if an anomaly
exists. An anomaly might be the absence of its own information in received
UDLD messages or the failure to receive UDLD messages. An Undetermined
state has no effect on the operation of the port. The port is not disabled and
continues operating. When operating in UDLD normal mode, a port will be
put into a disabled (Shutdown) state only in the following situations:
•
The UDLD PDU received from a partner does not have its own details
(echo).
•
When there is a loopback, and information sent out on a port is received
back exactly as it was sent.
•
Aggressive – The port is put into a disabled state for the same reasons that it
occurs in normal mode. Additionally, a port in UDLD aggressive mode can be
disabled if the port does not receive any UDLD echo packets even after
bidirectional connection was established. If a bidirectional link is established,
and packets suddenly stop coming from partner device, the UDLD
aggressive-mode port assumes that link has become unidirectional.
UDLD Status
The UDLD status on the port, which is one of the following:
•
Not Applicable – The administrative status of UDLD is globally disabled or
disabled on the interface.
•
Bidirectional – UDLD has detected a bidirectional link.
•
Shutdown – UDLD has detected a unidirectional link, and the port is in a
disabled state. To clear the disabled state, click UDLD Port Reset.
•
Undetermined – UDLD has not collected enough information to determine
the state of the port.
•
Unknown – The port link has physically gone down, but it is not because it
was put in a disabled state by the UDLD feature.
Click
Refresh
to display the latest information from the router.
If you change any information on the page, click
Submit
to apply the changes to the system.
Private VLAN
Use this screen to add Virtual Local Area Networks (VLANs) to the device and to configure existing
VLANs as private VLANs. Private VLANs provide Layer 2 isolation between ports that share the same
broadcast domain. In other words, a private VLAN allows a VLAN broadcast domain to be partitioned
into smaller point-to-multipoint subdomains. The ports participating in a private VLAN can be located
anywhere in the Layer 2 network. Each subdomain is defined (represented) by a primary VLAN and a
secondary VLAN. The primary VLAN ID is the same for all subdomains that belong to a private VLAN.
The secondary VLAN ID differentiates subdomains from each another and provides Layer 2 isolation
between ports that are members of the same private VLAN.
Private VLAN Configuration
To access the Private VLAN Configuration page, click
Switching
>
Private VLAN
>
Configuration
in the
navigation menu.
Configuring Switching Information
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