H3C S5120-EI Series, Руководство по эксплуатации

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1-8
The DLDP down port sends out a RecoverProbe packet, which carries only information about the local
port, every two seconds. Upon receiving the RecoverProbe packet, the remote end returns a
RecoverEcho packet. Upon receiving the RecoverEcho packet, the local port checks whether neighbor
information in the RecoverEcho packet is the same as the local port information. If they are the same,
the link between the local port and the neighbor is considered to have been restored to a bidirectional
link, and the port will transit from Disable state to Active state and re-establish neighborship with the
neighbor.
Only DLDP down ports can send and process Recover packets, including RecoverProbe packets and
RecoverEcho packets. If related ports are manually shut down with the
shutdown
command, the
auto-recovery mechanism will not take effect.
DLDP neighbor state
A DLDP neighbor can be in one of the three states described in Table 1-7 .
Table 1-7
Description on DLDP neighbor states
DLDP neighbor state Description
Unknown
A neighbor is in this state when it is just detected and is being probed. No
information indicating the state of the neighbor is received. A neighbor is
in this state only when it is being probed. It transits to Two way state or
Unidirectional state after the probe operation finishes.
Two way
A neighbor is in this state after it receives response from its peer. This
state indicates the link is a two-way link.
Unidirectional
A neighbor is in this state when the link connecting it is detected to be a
unidirectional link. After a device transits to this state, the corresponding
neighbor entries maintained on other devices are removed.
DLDP Configuration Task List
Complete the following tasks to configure DLDP:
Task Remarks
Enabling DLDP Required
Setting DLDP Mode Optional
Setting the Interval for Sending Advertisement Packets Optional
Setting the DelayDown Timer Optional
Setting the Port Shutdown Mode Optional
Configuring DLDP Authentication Optional
Resetting DLDP State Optional