Udld; Udld Overview - Cisco 350XG series Administration Manual

Port Management

UDLD

STEP 5
UDLD
Cisco 350XG & 550XG Series 10G Stackable Managed Switches
• 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.
Click Apply. The Running Configuration file is updated.
This section describes how the Unidirectional Link Detection (UDLD) feature.
It covers the following topics:
•

UDLD Overview

• UDLD Global Settings
• UDLD Interface Settings
• UDLD Neighbors
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.
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