Udld Configuration - Zte ZXR10 5250 Series Configuration Manual

Switch2(cfg)#set loopdetect port 1,2 enable
Switch2(cfg)#set loopdetect extend port 1 enable
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Configuration Verification
Check the loop detection state of switch2.
Switch2(cfg)#show loopdetect
The block-delay of loopdetect
The packet interval of loopdetect : 15
PortId
------
1
2

5.36 UDLD Configuration

UDLD Overview
UniDirectional Link Detection (UDLD) is a Layer 2 logical link detection protocol. It can
detect logical connectivity of Ethernet links and verify physical connectivity. Different from
physical connectivity detection, UDLD is neighbor-based detection. Layer 1 devices are
transparent for UDLD.
UDLD needs to establish neighbor relationship between Layer 2 devices first, A port
supports a maximum number of 12 neighbors. When the UDLD function is enabled on
an Ethernet port whose status is up, the port sends a Probe message inviting a neighbor
device to join. The port on which the UDLD function is enabled on the neighbor device
receives the Probe message and sends an Echo message. If the port receives the Echo
message, the connection between the devices works properly in both directions in the
view of the local device. Neighbor relationship is established with the peer device on the
local device. The local devices sends an Echo message. After the peer device receives
the Echo message, the neighbor relationship is established between the devices.
After neighbor relationship is established, the devices send Hello messages periodically
to detect whether the link is operating properly. When receiving a Hello message from the
neighbor, a device updates the neighbor information saved locally and resets the time-out
period of the neighbor. If the device does not receives a Hello message when the time-out
period expires, it is considered that the a fault occurs to the neighbor and the neighbor is
aged. If the last neighbor is deleted due to aging, it is considered that the link is not in
normal operating state. It is necessary to handle the problem according to working mode.
There are two UDLD working modes: normal mode and aggressive mode.
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In normal mode, only when the device receives a protocol message confirming that
the link is connected incorrectly will the port be shut down. If the device does not
receive the related message or cannot confirm that the link is working properly in one
direction, the device does not operate the port.
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In aggressive mode, if the device cannot confirm that the link is working properly in
both directions (such as the link is connected incorrectly, the link is working properly
SJ-20131111172707-002|2013-11-27 (R1.0)
isUp isStp isProtect
---- ----- ---------
Up No Yes
Up No Yes
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Chapter 5 Service Configuration
: 5 (min)
(sec)
isExtend loopVlanNum
-------- -----------
Yes 1
No 0
ZTE Proprietary and Confidential
loopType
---------
Port
Port