Configure ULFD Basic Function
Network Requirements
- Device1 and Device2 are connected via the fiber.
- Configure the ULFD aggressive mode to disable the port when detecting the uni-directional link.
Network Topology
![Networking of configuring the ULFD basic function](/storage/images/Document/Maipu/reliability/config-ulfd-basic-function.jpg)
Figure 2-3 Networking of configuring the ULFD basic function
Configuration Steps
Step 1: Configure the ULFD function
#Enable the ULFD function on Device1 and configure the ULFD work mode as the aggressive mode on port gigabitethernet0/1.
Device1#configure terminal
Device1(config)#ulfd aggressive
Device1(config)#interface gigabitethernet 0/1
Device1(config-if-gigabitethernet0/1)#ulfd port aggressive
Device1(config-if-gigabitethernet0/1)#exit
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#Enable the ULFD function on Device2 and configure the ULFD work mode on port gigabitethernet0/1 as the aggressive mode.
Device2#configure terminal
Device2(config)#ulfd aggressive
Device2(config)#interface gigabitethernet 0/1
Device2(config-if-gigabitethernet0/1)#ulfd port aggressive
Device2(config-if-gigabitethernet0/1)#exit
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#View the ULFD information of port gigabitethernet0/1 on Device1.
Device1#show ulfd interface gigabitethernet 0/1
Interface name : gigabitethernet0/1
ULFD config mode : Aggressive
ULFD running mode : Aggressive
Link status : Link Up
Link direction : Bidirectional
ULFD fsm status : Advertisement
Neighbors number : 1
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Device ID : 00017a787878
Interface name : gigabitethernet0/1
Device Name : Device2
Message Interval : 15
Timeout Interval : 5
Link Direction : Bidirectional
Aging Time : 40
Time to Die : 36
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![note](/storage/images/Document/Maipu/note-icon.jpg)
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The method of viewing the port ULFD information on Device2 is the same as that of Device1. (Omitted)
Step 2: Check the result.
#In the actual networking environment (refer to Figure 2-1 and Figure 2-2), when the fibers are cross-connected or one fiber is not connected, disconnected, it results in the uni-directional communication. After configuring the ULFD function, port gigabitethernet0/1 is disabled when detecting the uni-directional connection on Device1 and the following log information is output:
%ULFD_LOG_WARN: gigabitethernet0/1: detected Unidirectional neighbor: device ID[00017a787878], device name[Device2], interface name[gigabitethernet0/1]!
%LINK-INTERFACE_DOWN-3: interface gigabitethernet0/1, changed state to down
%ULFD-UNDIR_LINK_ERR_V3-4: ULFD shutdown interface gigabitethernet0/1 successful
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#View the status of the port gigabitethernet0/1 and we can see that the port is disabled.
Device1#show interface gigabitethernet 0/1
gigabitethernet0/1 configuration information
Description :
Status : Enabled
Link : Down (Err-disabled)
Set Speed : Auto
Act Speed : Unknown
Set Duplex : Auto
Act Duplex : Unknown
Set Flow Control : Off
Act Flow Control : Off
Mdix : Normal
Mtu : 1824
Port mode : LAN
Port ability : 100M FD,1000M FD
Link Delay : No Delay
Storm Control : Unicast Disabled
Storm Control : Broadcast Disabled
Storm Control : Multicast Disabled
Storm Action : None
Port Type : Nni
Pvid : 1
Set Medium : Fiber
Act Medium : Fiber
Mac Address : 0000.1111.2224
![note](/storage/images/Document/Maipu/note-icon.jpg)
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When configuring the ULFD function, ensure that ULFD configured at the two sides of the link work in the same detection mode.
- When ULFD common work mode is normal mode, refer to the configuration method. The normal mode only supports detecting the single-pass caused by the cross-connection of the fiber.