H3C Technologies H3C S6800 Series Switches - Manual (Page 13)

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packet to Port 2. At the same time, Port 1 deletes the neighborship with Port 2, and starts the
RecoverProbe timer. Port 2 stays in Inactive state during this process.
Detecting multiple neighbors
When multiple devices are connected through a hub, enable DLDP on all interfaces connected to the hub
to detect unidirectional links among the neighbors. When no Confirmed neighbor exists, an interface
enters the Unidirectional state.
Figure 4 Network diagram
As shown in Figure 4 , Device A through Device D are connected through a hub, and enabled with DLDP.
When Port 1, Port 2, and Port 3 detect that the link to Port 4 fails, they deletes the neighborship with Port
4, but stay in Bidirectional state.
Configuration restrictions and guidelines
When you configure DLDP, follow these configuration restrictions and guidelines:
• For DLDP to operate correctly, enable DLDP on both sides and make sure these settings are
consistent: the interval to send Advertisement packets, DLDP authentication mode, and password.
• For DLDP to operate correctly, configure the full duplex mode for the ports at the two ends of the link,
and configure the same speed for the two ports.
DLDP configuration task list
Tasks at a glance
(Required.) Enabling DLDP
(Optional.) Setting the interval to send advertisement packets
(Optional.) Setting the DelayDown timer
(Optional.) Setting the port shutdown mode
(Optional.) Configuring DLDP authentication