Example for Configuring DLDP to Detect Intersected Fibers
Networking Requirements
As shown in Figure 6-9, 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. Optical fibers may be cross connected, as shown in Figure 6-10. The requirement is to detect unidirectional links caused by cross connections of optical fibers.
Configuration Roadmap
The configuration roadmap is as follows:
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.
<HUAWEI> system-view [HUAWEI] sysname SwitchA [SwitchA] interface gigabitethernet 1/0/1 [SwitchA-GigabitEthernet1/0/1] undo negotiation auto [SwitchA-GigabitEthernet1/0/1] quit [SwitchA] interface gigabitethernet 1/0/2 [SwitchA-GigabitEthernet1/0/2] undo negotiation auto [SwitchA-GigabitEthernet1/0/2] quit
- Enable DLDP globally on SwitchA.
[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 [SwitchA] interface gigabitethernet 1/0/2 [SwitchA-GigabitEthernet1/0/2] dldp enable [SwitchA-GigabitEthernet1/0/2] 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 dldp interface gigabitethernet 1/0/1 Interface GigabitEthernet1/0/1 DLDP port state: advertisement DLDP link state: up The neighbor number of the port is: 1. Neighbor mac address:0001-0001-0001 Neighbor port index:26 Neighbor state:two way Neighbor aged time(s):206
[SwitchA] display dldp interface gigabitethernet 1/0/2 Interface GigabitEthernet1/0/2 DLDP port state: advertisement DLDP link state: up The neighbor number of the port is: 1. Neighbor mac address:0001-0001-0001 Neighbor port index:28 Neighbor state:two way Neighbor aged time(s):188
[SwitchB] display dldp interface gigabitethernet 1/0/1 Interface GigabitEthernet1/0/1 DLDP port state: advertisement DLDP link state: up The neighbor number of the port is: 1. Neighbor mac address:781d-ba57-c24a Neighbor port index:51 Neighbor state:two way Neighbor aged time(s):235
[SwitchB] display dldp interface gigabitethernet 1/0/2 Interface GigabitEthernet1/0/2 DLDP port state: advertisement DLDP link state: up The neighbor number of the port is: 1. Neighbor mac address:781d-ba57-c24a Neighbor port index:53 Neighbor state:two way Neighbor aged time(s):214
As shown in Figure 6-10, if a unidirectional link occurs between the interfaces on SwitchA and SwitchB due to cross connections of optical fibers, DLDP will shut down the interfaces.
Run the display dldp command on SwitchA and SwitchB. The command output shows that the DLDP status of interfaces on SwitchA and SwitchB is disable.
[SwitchA] 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. [SwitchA] display dldp interface gigabitethernet 1/0/2 Interface GigabitEthernet1/0/2 DLDP port state: disable DLDP link state: up 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. [SwitchB] display dldp interface gigabitethernet 1/0/2 Interface GigabitEthernet1/0/2 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$9%#%# # interface GigabitEthernet1/0/1 undo negotiation auto dldp enable # interface GigabitEthernet1/0/2 undo negotiation auto dldp enable # return
SwitchB configuration file
# sysname SwitchB # dldp enable dldp interval 10 dldp delaydown-timer 4 dldp authentication-mode sha %#%#|I<VLDbQrWDa"<!e'7WVN,l%(t0ga;&{$r,Mrq*<!,}(C|oZXAz1!gIH}*x:%#%# # interface GigabitEthernet1/0/1 undo negotiation auto dldp enable # interface GigabitEthernet1/0/2 undo negotiation auto dldp enable # return