Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 937)

Multi-Service IronWare Switching Configuration Guide 907
53-1003036-02
Chapter
24
Configuring Uni-Directional Link Detection (UDLD)
Table 120 displays the individual Brocade devices and the Uni-Directional Link Detection (UDLD)
features they support.
Uni-directional Link Detection (UDLD) monitors a link between two Brocade devices and provides a
fast detection of link failures. UDLD 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 LAG links.
Figure 210 shows an example.
FIGURE 210 UDLD example
By default, ports enabled for UDLD exchange proprietary health-check packets once every 500 ms
(the keepalive interval). If a port does not receive a health-check packet from the port at the other
end of the link within the keepalive interval, the port waits for four more intervals. If the port still
does not receive a health-check packet after waiting for five intervals, the port concludes that the
link has failed and takes the port down.
The Keepalive Interval and Keepalive Retries can be configured to values other than the default, as
shown in
“Changing the keepalive interval” and “Changing the keepalive retries” .
TABLE 120 Supported Brocade Uni-Directional Link Detection (UDLD) features
Features
supported Brocade
NetIron XMR
Series Brocade
MLX Series Brocade
NetIron CES
2000 Series
BASE
package Brocade
NetIron CES
2000 Series
ME_PREM
package Brocade
NetIron CES
2000 Series
L3_PREM
package Brocade
NetIron CER
2000 Series
Base
package Brocade
NetIron CER
2000 Series
Advanced
Services
package
Uni-Directional
Link Detection
(UDLD) Yes Yes Yes Yes Yes Yes Yes
UDLD for
Tagged Ports Yes Yes Yes Yes Yes Yes Yes