• SW1

SW1#udld reset 
No ports are disabled by UDLD.
SW1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
SW1(config)#conf t
             ^
% Invalid input detected at '^' marker.

SW1(config)#udl
SW1(config)#udld en
SW1(config)#udld enable 
SW1(config)#udld aggre
SW1(config)#udld aggressive me
SW1(config)#udld aggressive ? 
  <cr>

SW1(config)#udld aggressive 
SW1(config)#udld aggressive 
SW1(config)#udl
SW1(config)#udld mess
SW1(config)#udld message ti
SW1(config)#udld message time 1
SW1(config)#do sh run | i udld
udld aggressive
udld message time 1
SW1(config)#no ud
SW1(config)#no udld agg
SW1(config)#no udld aggressive 
SW1(config)#no udl
SW1(config)#no udld mess
SW1(config)#no udld message t
SW1(config)#no udld message ti
SW1(config)#no udld message time
SW1(config)#do sh run | i udld  
SW1(config)#int gig
SW1(config)#do sh int status    

Port      Name               Status       Vlan       Duplex  Speed Type
Fa1/0/1                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/2                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/3                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/4                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/5                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/6                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/7                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/8                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/9                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/10                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/11                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/12                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/13                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/14                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/15                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/16                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/17                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/18                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/19                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/20                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/21                     notconnect   1            auto   auto 10/100BaseTX
          
Port      Name               Status       Vlan       Duplex  Speed Type
Fa1/0/22                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/23                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/24                     notconnect   1            auto   auto 10/100BaseTX
Gi1/0/1                      notconnect   1            auto   auto Not Present
Gi1/0/2                      notconnect   1            auto   auto Not Present
SW1(config)#int gig1/0/1
SW1(config-if)#udl
SW1(config-if)#udld po
SW1(config-if)#udld port 
SW1(config-if)#udl
SW1(config-if)#do sh run int gig1/0/1
Building configuration...

Current configuration : 49 bytes
!
interface GigabitEthernet1/0/1
 udld port
end

SW1(config-if)#udld port agg
SW1(config-if)#udld port aggressive 
SW1(config-if)#udl
SW1(config-if)#udld po
SW1(config-if)#udld port ?
  aggressive  Enable UDLD protocol in aggressive mode on this interface
  <cr>

SW1(config-if)#udld ?    
  port  Enable UDLD protocol on this interface

SW1(config-if)#udld me
SW1(config-if)#do sh run int gig1/0/1
Building configuration...

Current configuration : 60 bytes
!
interface GigabitEthernet1/0/1
 udld port aggressive
end

SW1(config-if)#^Z
SW1#udl 
*Mar  1 00:27:04.722: %SYS-5-CONFIG_I: Configured from console by console
SW1#udld
SW1#udld rese
SW1#udld reset 
No ports are disabled by UDLD.
SW1#

• SW2

SW2#udld reset 
No ports are disabled by UDLD.
SW2#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
SW2(config)#udl
SW2(config)#udld en
SW2(config)#udld enable 
SW2(config)#do sh run | i udld
udld enable
SW2(config)#udld
SW2(config)#udld mess
SW2(config)#udld aggre   
SW2(config)#udld aggressive 
SW2(config)#udl
SW2(config)#udld mess
SW2(config)#udld message ti
SW2(config)#udld message time 1
SW2(config)#do sh run | i udld
udld aggressive
udld message time 1
SW2(config)#no udld agg
SW2(config)#no udld aggressive 
SW2(config)#no ud
SW2(config)#no udld mess
SW2(config)#no udld message ?
  <cr>

SW2(config)#no udld message 
SW2(config)#do sh run | i udld 
SW2(config)#do sh run | i udld
SW2(config)#do sh run all | i udld
SW2(config)#int gig1/0/1
SW2(config-if)#do sh int status

Port      Name               Status       Vlan       Duplex  Speed Type
Fa1/0/1                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/2                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/3                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/4                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/5                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/6                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/7                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/8                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/9                      notconnect   1            auto   auto 10/100BaseTX
Fa1/0/10                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/11                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/12                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/13                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/14                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/15                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/16                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/17                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/18                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/19                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/20                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/21                     notconnect   1            auto   auto 10/100BaseTX
          
Port      Name               Status       Vlan       Duplex  Speed Type
Fa1/0/22                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/23                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/24                     notconnect   1            auto   auto 10/100BaseTX
Gi1/0/1                      notconnect   1            auto   auto Not Present
Gi1/0/2                      notconnect   1            auto   auto Not Present
SW2(config-if)#udl
SW2(config-if)#udld po
SW2(config-if)#udld port aggre
SW2(config-if)#udld port aggressive 
SW2(config-if)#do sh run int gig1/0/1
Building configuration...

Current configuration : 60 bytes
!
interface GigabitEthernet1/0/1
 udld port aggressive
end

SW2(config-if)#shutdown
SW2(config-if)#no shut
SW2(config-if)#shut
SW2(config-if)#no shut
SW2(config-if)#
*Mar  1 00:26:44.111: %LINK-5-CHANGED: Interface GigabitEthernet1/0/1, changed state to administratively down
SW2(config-if)#
*Mar  1 00:26:46.217: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to down
SW2(config-if)#exit
SW2(config)#err
SW2(config)#errdisable reco
SW2(config)#errdisable recovery cau
SW2(config)#errdisable recovery cause udl
SW2(config)#errdisable recovery cause udld 
SW2(config)#err
SW2(config)#errdisable disa
SW2(config)#errdisable disa
SW2(config)#errdisable reco
SW2(config)#errdisable recovery inter
SW2(config)#errdisable recovery interval 300
SW2(config)#do sh run | i errdisable
errdisable recovery cause udld
SW2(config)#err                             
SW2(config)#errdisable re
SW2(config)#errdisable recovery inter
SW2(config)#errdisable recovery interval 600 
SW2(config)#err
SW2(config)#errdisable re
SW2(config)#errdisable recovery i
SW2(config)#do sh run | i errdisable     
errdisable recovery cause udld
errdisable recovery interval 600
SW2(config)#^Z
SW2#
*Mar  1 00:28:43.011: %SYS-5-CONFIG_I: Configured from console by console
SW2#