3Com 4210G Series, Configuration Manual, Page: 771 / 1133

4-8
Table 4-7
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
Note that:
z
DLDP takes effects only on Ethernet interfaces.
z
DLDP can detect unidirectional links only after all links are connected. Therefore, before enabling
DLDP, make sure that optical fibers or copper twisted pairs are connected.
z
To ensure unidirectional links can be detected, make sure these settings are the same on the both
sides: DLDP state (enabled/disabled), the interval for sending Advertisement packets,
authentication mode, and password.
z
Keep the interval for sending Advertisement packets adequate to enable unidirectional links to be
detected in time. If the interval is too long, unidirectional links cannot be terminated in time; if the
interval is too short, network traffic may increase in vain.
z
DLDP does not process any link aggregation control protocol (LACP) events. The links in an
aggregation group are treated individually in DLDP.
z
When connecting two DLDP-enabled devices, make sure the DLDP software version ID fields of
the DLDP packets exchanged between the two devices are the same. Otherwise, DLDP may
operate improperly.
Enabling DLDP
To properly configure DLDP on the device, you need to first enable DLDP globally, and then enable it
on each port.