Example for Configuring DLDP to Detect a Disconnected Optical Fiber Link
Networking Requirements
As shown in Figure 6-8, SwitchA and SwitchB are connected through a pair of optical fibers. On an optical fiber, Rx indicates the receive end, and Tx indicates the transmit end. The requirement is to detect unidirectional links.
Configuration Roadmap
Configure the interfaces on both ends to work in non-auto-negotiation mode.
Enable DLDP to detect unidirectional links between SwitchA and SwitchB.
Adjust DLDP parameters to detect unidirectional links more efficiently.
Procedure
- Configure the interfaces on SwitchA to work in non-auto negotiation mode.
<Quidway> system-view [Quidway] sysname SwitchA [SwitchA] interface gigabitethernet 1/0/1 [SwitchA-GigabitEthernet1/0/1] undo negotiation auto [SwitchA-GigabitEthernet1/0/1] quit
- Enable DLDP globally.
[SwitchA] dldp enable - Enable DLDP on an interface of SwitchA.
[SwitchA] interface gigabitethernet 1/0/1 [SwitchA-GigabitEthernet1/0/1] dldp enable [SwitchA-GigabitEthernet1/0/1] quit
- Set the interval for sending Advertisement packets to 10 seconds on SwitchA.
[SwitchA] dldp interval 10 - Set the timeout value of the DelayDown timer to 4 seconds on SwitchA.
[SwitchA] dldp delaydown-timer 4 - Set the authentication mode of DLDPDUs to SHA2-256 password authentication and set the password to Huawei-123 on SwitchA.
[SwitchA] dldp authentication-mode sha Huawei-123
Perform steps 1 to 6 on SwitchB.
- Verify the configuration.
After the configuration is complete, run the display dldp command in the interface view. The command output shows that the DLDP status of the interface is advertisement.
[SwitchA] display dldpDLDP global status: enable DLDP interval: 10s DLDP work-mode: enhance DLDP authentication-mode: sha, password is ****** DLDP unidirectional-shutdown: auto DLDP delaydown-timer: 4s The number of enabled ports is: 1 The number of global neighbors is: 1 The max number of global neighbors is: 4096 Interface GigabitEthernet1/0/1 DLDP port state: advertisement DLDP link state: up The neighbor number of the port is: 1. Neighbor mac address:80fb-0636-792d Neighbor port index:49 Neighbor state:two way Neighbor aged time(s):16
Simulate an optical fiber disconnection by removing the receive optical fiber from SwitchA. DLDP automatically shuts down GE1/0/1 on SwitchB when a unidirectional link occurs between SwitchA and GE1/0/1 on SwitchB.
# Run the display dldp command on SwitchA and SwitchB. The command output shows that the DLDP status of GE1/0/1 on SwitchA is inactive, and the DLDP status of GE1/0/1 on SwitchB is disable.
[SwitchA] display dldp interface gigabitethernet 1/0/1 Interface GigabitEthernet1/0/1 DLDP port state: inactive DLDP link state: down The neighbor number of the port is: 0.
[SwitchB] display dldp interface gigabitethernet 1/0/1 Interface GigabitEthernet1/0/1 DLDP port state: disable DLDP link state: up The neighbor number of the port is: 0.
Configuration Files
SwitchA configuration file
# sysname SwitchA # dldp enable dldp interval 10 dldp delaydown-timer 4 dldp authentication-mode sha %#%#x=4::bbwY1`:YhJ/e*kK_I:ONJ|CYMO/=^0QyZXEfr0xL'5Md,<4Dl:`za$9%#%# # interface GigabitEthernet1/0/1 undo negotiation auto dldp enable # return
SwitchB configuration file
# sysname SwitchB # dldp enable dldp interval 10 dldp delaydown-timer 4 dldp authentication-mode sha %#%#|I<VLDbQrWDa"<!e'7WVN,l%(t0ga;&{$r,Mrq*<!,}(C|oZXAz1!gIH}*x:%#%# # interface GigabitEthernet1/0/1 undo negotiation auto dldp enable # return