UDLD

UniDirectional Link Detection Protocol – UDLD

SW1#sh udld fa0/18

Interface Fa0/18
---
Port enable administrative configuration setting: Disabled
Port enable operational state: Disabled
Current bidirectional state: Unknown

Configuration

SW1(config)#interface fastEthernet 0/18
SW1(config-if)#udld port aggressive 

Vérification

SW1#show udld fa0/18

Interface Fa0/18
---
Port enable administrative configuration setting: Enabled / in aggressive mode
Port enable operational state: Enabled / in aggressive mode
Current bidirectional state: Unknown
Current operational state: Advertisement
Message interval: 7
Time out interval: 5
No neighbor cache information stored

Configuration Bidirectionnel

SW2#conf t
SW2(config)#int fa 0/18
SW2(config-if)#udld port aggressive 
SW1#show udld fa0/18

Interface Fa0/18
---
Port enable administrative configuration setting: Enabled / in aggressive mode
Port enable operational state: Enabled / in aggressive mode
Current bidirectional state: Bidirectional
Current operational state: Advertisement - Single neighbor detected
Message interval: 7
Time out interval: 5

    Entry 1
    ---
    Expiration time: 44
    Cache Device index: 1
    Current neighbor state: Bidirectional
    Device ID: CAT0742X0UJ 
    Port ID: Fa0/18 
    Neighbor echo 1 device: CAT1013N35D
    Neighbor echo 1 port: Fa0/18

    Message interval: 15
    Time out interval: 5
    CDP Device name: SW2 

Recovery

SW1#conf t
SW1(config)#errdisable recovery cause udld 
SW1(config)#errdisable recovery interval 180
SW1#show errdisable recovery
ErrDisable Reason            Timer Status
-----------------            --------------
arp-inspection               Disabled
bpduguard                    Disabled
channel-misconfig            Disabled
dhcp-rate-limit              Disabled
dtp-flap                     Disabled
gbic-invalid                 Disabled
l2ptguard                    Disabled
link-flap                    Disabled
mac-limit                    Disabled
link-monitor-failure         Disabled
loopback                     Disabled
oam-remote-failure           Disabled
pagp-flap                    Disabled
port-mode-failure            Disabled
psecure-violation            Disabled
security-violation           Disabled
sfp-config-mismatch          Disabled
storm-control                Disabled
udld Enabled
unicast-flood                Disabled
vmps                         Disabled

Timer interval: 180 seconds

Interfaces that will be enabled at the next timeout:
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