PowerConnect B-Series FCX Configuration Guide 383
53-1002266-01
Chapter
11
Configuring Uni-Directional Link Detection (UDLD) and
Protected Link Groups
Table 66 lists the individual Dell PowerConnect switches and the UDLD and protected link group
features they support. These features are supported in the Layer 2, base Layer 3, edge Layer 3,
and full Layer 3 software images, except where explicitly noted.
UDLD overview
Uni-Directional Link Detection (UDLD) monitors a link between two Dell PowerConnect devices and
brings the ports on both ends of the link down if the link goes down at any point between the two
devices. This feature is useful for links that are individual ports and for trunk links. Figure 77
shows an example.
FIGURE 77 UDLD example
TABLE 66 Supported UDLD and protected link group features
Feature PowerConnect B-Series FCX
Uni-directional Link Detection (UDLD)
(Link keepalive)
Yes
UDLD on tagged ports Yes
Protected link groups Yes
X
Without link keepalive, the ports remain
enabled. Traffic continues to be load balanced to the
ports connected to the failed link.
When link keepalive is enabled, the feature
brings down the ports connected
to the failed link.
Switch Switch
