Port Management
UDLD
Cisco 350XG & 550XG Series 10G Stackable Managed Switches
175
10
•
Port
—Select the port number to which timeout and priority values are
assigned.
•
LACP Port Priority
—Enter the LACP priority value for the port.
•
LACP Timeout
—Time interval between the sending and receiving of
consecutive LACP PDUs. Select the periodic transmissions of LACP PDUs,
which occur at either a
Long
or
Short
transmission speed, depending upon
the expressed LACP timeout preference.
STEP 5
Click
Apply
. The Running Configuration file is updated.
UDLD
This section describes how the Unidirectional Link Detection (UDLD) feature.
It covers the following topics:
•
•
•
•
UDLD Overview
UDLD is a Layer 2-protocol that enables devices connected through fiber-optic or
twisted-pair Ethernet cables to detect unidirectional links. A unidirectional link
occurs whenever traffic from a neighboring device is received by the local device,
but traffic from the local device is not received by the neighbor.
The purpose of UDLD is to detect ports on which the neighbor does not receive
traffic from the local device (unidirectional link) and to shut down those ports.
All connected devices must support UDLD for the protocol to successfully detect
unidirectional links. If only the local device supports UDLD, it is not possible for the
device to detect the status of the link. In this case, the status of the link is set to
undetermined. The user can configure whether ports in the undetermined state
are shut down or merely trigger notifications.
