Link Auto-Recovery Mechanism; Dldp Configuration; Performing Basic Dldp Configuration - H3C S3100 Series Operation Manual

Link Auto-recovery Mechanism

If the shutdown mode of a port is set to auto shutdown, the port is set to the DLDP down state when
DLDP detects the link connecting to the port is a unidirectional link. A port in DLDP down state does not
forward service packets or receive/send protocol packets except DLDPDUs.
A port in the DLDP down state recovers when the corresponding link recovers. A port in the DLDP down
state sends recover probe packets periodically. On receiving a correct recover echo packet (which
means that the unidirectional link is restored to a bidirectional link), it is brought up by DLDP. The
detailed process is as follows.
1) A port in the DLDP down state sends a recover probe packet every 2 seconds. Recover probe
packets carry only the local port information.
2) Upon receiving a recover probe packet, the peer end responds with a recover echo packet.
3) Upon receiving a recover echo packet, the local end checks to see if the neighbor information
carried in the recover echo packet is consistent with that of the local port. If yes, the link between
the local port and the neighbor is considered to be recovered to bidirectional, the port changes from
the disable state to the active state, and neighboring relationship is reestablished between the local
port and the neighbor.
Only ports in the DLDP down state can send and process recover probe packets and recover echo
packets. The auto-recovery mechanism does apply to ports that are shut down manually.

DLDP Configuration

Performing Basic DLDP Configuration

Follow these steps to perform basic DLDP configuration:
Enter system view
Enable DLDP on all optical
ports of the switch
Enable DLDP
Enable
on the current
DLDP
port (a
non-optical
port or an
optical port)
Set the authentication mode and
password
Set the interval of sending DLDP packets
To do ...
Enter Ethernet
port view
Enable DLDP
Use the command ...
system-view
dldp enable
interface interface-type
interface-number
dldp enable
dldp
authentication-mode
{ none | simple
simple-password | md5
md5-password }
dldp interval timer-value
1-9
Remarks
—
Required.
By default, DLDP is
disabled.
Optional.
By default, the
authentication mode is
none.
Optional.
By default, the interval is 5
seconds.