Configuration Guide User guide

FastIron Configuration Guide 685
53-1002494-02
Chapter
19
UDLD and Protected Link Groups
Table 127 lists the individual Brocade FastIron switches and the Uni-Directional Link Detection
(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 Brocade 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 61 shows an
example.
FIGURE 61 UDLD example
Normally, a Brocade device load balances traffic across the ports in a trunk group. In this example,
each Brocade device load balances traffic across two ports. Without the UDLD feature, a link
failure on a link that is not directly attached to one of the Brocade devices is undetected by the
Brocade devices. As a result, the Brocade devices continue to send traffic on the ports connected
to the failed link.
TABLE 127 Supported UDLD and protected link group features
Feature FESX
FSX 800
FSX 1600
FWS FCX ICX 6610 ICX 6430
ICX 6450
Uni-directional Link Detection (UDLD)
(Link keepalive)
Yes Yes Yes Yes Yes
UDLD on tagged ports Yes Yes Yes Yes Yes
Protected link groups Yes Yes Yes Yes Yes
X
FastIron Switch
When link keepalive is enabled, the feature
brings down the FastIron ports connected
to the failed link.
FastIron Switch