Maipu Administration Guide

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

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

#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

#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 
---------------------
   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 
 -------------------------------------

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

#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

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.