Chapter 13
| Basic Administration Protocols
UDLD Configuration
– 534 –
Configuring UDLD
Protocol Intervals
Use the Administration > UDLD > Configure Global page to configure the
UniDirectional Link Detection message probe interval, detection interval, and
recovery interval.
Parameters
These parameters are displayed:
◆ Message Interval – Configures the message interval between UDLD probe
messages for ports in the advertisement phase and determined to be
bidirectional. (Range: 7-90 seconds; Default: 15 seconds)
UDLD probe messages are sent after linkup or detection phases. During the
detection phase, messages are exchanged at the maximum rate of one per
second. After that, if the protocol reaches a stable state and determines that the
link is bidirectional, the message interval is increased to a configurable value
based on a curve known as M1(t), a time-based function described in RFC 5171.
If the link is deemed anything other than bidirectional at the end of the
detection phase, this curve becomes a flat line with a fixed value of Mfast (7
seconds).
If the link is instead deemed bidirectional, the curve will use Mfast for the first
four subsequent message transmissions and then transition to an Mslow value
for all other steady-state transmissions. Mslow is the value configured by this
command.
◆ Detection Interval – Sets the amount of time the switch remains in detection
state after discovering a neighbor. (Range: 5-255 seconds; Default: 5 seconds)
When a neighbor device is discovered by UDLD, the switch enters “detection
state” and remains in this state for specified detection-interval. After the
detection-interval expires, the switch tries to decide whether or the link is
unidirectional based on the information collected during the “detection state.”
◆ Recovery Status – Configures the switch to automatically recover from UDLD
disabled port state after a period specified by the Recovery Interval. (Default:
Disabled)
When automatic recovery state is changed, any ports shut down by
UDLD will be reset.
◆
Recovery Interval – Specifies the period after which to automatically recover
from UDLD disabled port state. (Range: 30-86400 seconds; Default: 7 seconds)
When the recovery interval is changed, any ports shut down by UDLD will be
reset.
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