1.1.1 display
dldp
Syntax
display dldp
{ unit-id | interface-type interface-number }
View
Any view
Parameter
unit-id:
Unit number of a device.
interface-type: Port type.
interface-number: Port number.
Description
Use the display dldp command to
display the DLDP configuration information of the specified unit or the
specified port.
The configuration information includes the
following:
l
Configuration information of the DLDP-enabled
port, such as interval, authentication mode, password, DLDP operating mode, and
handling mode when a unidirectional link is found, and the delaydown timer..
l
Status information, such as neighbor status,
local port status, and link status.
l
Neighbor table containing MAC address, port ID,
neighbor status, and aging time.
Example
# Display information about all DLDP-enabled
ports on unit 1.
<H3C> display dldp 1
dldp interval 10
dldp work-mode enhance
dldp authentication-mode none
dldp unidirectional-shutdown
manual
dldp delaydown-timer 1
The port number of unit 1 with DLDP
is 1.
interface GigabitEthernet1/1/1
dldp port state : advertisement
dldp link state : up
The neighbor number of the port
is 1.
neighbor mac address : 000f-e20f-750d
neighbor port index : 98
neighbor state : two way
neighbor aged time : 24
Syntax
dldp { enable
| disable }
View
System view/Ethernet port view
Parameter
None
Description
In system view:
Use the dldp enable command to
enable DLDP on all optical ports of the switch.
Use the dldp disable command to disable
DLDP on all optical ports of the switch.
In Ethernet port view:
Use the dldp enable command to
enable DLDP on the current port.
Use the dldp disable command to
disable DLDP on the current port.
The dldp command can apply to a
non-optical port as well as an optical port.
By default, DLDP is disabled.
When you use the dldp
enable/dldp disable command in system view to enable/disable DLDP on all
optical ports of the switch, the configuration takes effect on the existing
optical ports, instead of those added subsequently.
Example
# Enable DLDP on all optical ports of the
switch.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] dldp enable
Syntax
dldp authentication-mode { none | simple simple-password | md5 md5-password
}
undo dldp authentication-mode
View
System view
Parameter
none: Sets
the authentication mode on the port to none (Performs no authentication
on the port).
simple: Sets
the authentication mode on the port to plain text.
simple-password: Plain text authentication password, a string in plain text
consisting of 1 to 16 characters.
md5: Sets
the authentication mode on the port to MD5.
md5-password:
MD5 authentication password, a string in plain text consisting of 1 to 16
characters or a string in cipher text corresponding to the string in plain
text.
Description
Use the dldp authentication-mode command
to set the DLDP authentication mode and password on the current port.
Use the undo dldp authentication-mode
to remove the DLDP authentication mode and password on the current port.
By default, the authentication mode on the
current port is none.
Note that:
When you configure a DLDP authentication
mode and authentication password on a port, make sure that the same DLDP
authentication mode and password are set on the ports connected with a fiber
cable or copper twisted pair. Otherwise, DLDP authentication fails. DLDP cannot
work before DLDP authentication succeeds.
Related command: dldp
unidirectional-shutdown.
Example
# Set the DLDP authentication mode and
password to plain text and abc respectively on the ports connected with a fiber
cable or copper twisted pair between H3C A and H3C B.
l
Configure H3C A
<H3CA> system-view
System View: return to User View with
Ctrl+Z.
[H3CA] dldp authentication-mode
simple abc
l
Configure H3C B
<H3CB> system-view
System View: return to User View with
Ctrl+Z.
[H3CB] dldp authentication-mode
simple abc
Syntax
dldp interval timer-value
undo dldp interval
View
System view
Parameter
timer-value:
Interval between sending DLDP packets in seconds, in the range of 5 to 100. It
is 10 by default.
Description
Use the dldp interval command to set
the interval between sending advertisement packets for all DLDP-enabled ports
in the advertisement state.
Use the undo dldp interval command
to restore the interval to the default value.
By default, the interval between sending
advertisement packets is 10 seconds.
Note that:
l
The interval takes effect on all DLDP-enabled ports.
l
The interval must be shorter than one-third of
the STP convergence time. If too long an interval is set, an STP loop may occur
before DLDP shuts down unidirectional links. On the contrary, if too short an interval
is set, network traffic increases, and port bandwidth is reduced. Generally,
the STP convergence time is 30 seconds.
Example
# Set the interval between sending
advertisement packets to 20 seconds for all DLDP-enabled ports in the advertisement
state.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] dldp interval 20
Syntax
dldp reset
View
System view/Ethernet port view
Parameter
None
Description
In system view:
Use the dldp reset command to reset
the DLDP status of all the ports disabled by DLDP.
In Ethernet port view:
Use the dldp reset command to reset
the DLDP status of the current port disabled by DLDP.
After the dldp reset command is
executed, the DLDP status of a port changes from disable to active
and DLDP restarts to detect the link status of the fiber cable or copper
twisted pair.
Related command: dldp and dldp
unidirectional-shutdown.
Example
# Reset the DLDP status of all the ports
disabled by DLDP.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] dldp reset
Syntax
dldp unidirectional-shutdown { auto | manual }
undo dldp
unidirectional-shutdown
View
System view
Parameter
auto: Disables
automatically the corresponding port when DLDP detects an unidirectional link
or finds in the enhanced mode that the peer port is down.
manual: Prompts
the user to disable manually the corresponding port when DLDP detects an
unidirectional link or finds in the enhanced mode that the peer port is down.
After the port is disabled, it stops sending and receiving DLDP packets.
Description
Use the dldp unidirectional-shutdown command
to set the DLDP handling mode after a unidirectional link is found.
Use the undo dldp
unidirectional-shutdown command to restore the default DLDP handling mode
after a unidirectional link is found.
By default, the DLDP handling mode after a
unidirectional link is found is auto.
Related command: dldp work-mode.
Example
# Configure DLDP to automatically disable
the corresponding port when a unidirectional link is found.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] dldp unidirectional-shutdown
auto
Syntax
dldp work-mode { enhance | normal }
undo dldp
work-mode
View
System view
Parameter
enhance: Configures
DLDP to work in enhanced mode. In this mode, DLDP detects whether neighbors
exist when neighbor tables are aging.
normal: Configures
DLDP to work in normal mode. In this mode, DLDP does not detect whether
neighbors exist when neighbor tables are aging.
Description
Use the dldp work-mode command to
set the DLDP operating mode.
Use the undo dldp work-mode command
to restore the default DLDP operating mode.
By default, DLDP works in normal mode.
l
When DLDP works in normal mode, the system can
identify only the unidirectional link caused by fiber cross-connection.
l
When the DLDP protocol works in enhanced mode,
the system can identify two types of unidirectional links: one is caused by fiber
cross-connection and the other is caused by one fiber being not connected or
being broken.
Example
# Configure DLDP to work in enhanced mode.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] dldp work-mode enhance
Syntax
dldp delaydown-timer delaydown-time
undo dldp delaydown-timer
View
System view
Parameter
delaydown-time: Delaydown timer to be set (in seconds). This argument ranges from
1 to 5. By default, the delaydown timer expires after 1 second it is triggered.
Description
Use the dldp delaydown-timer command
to set the delaydown timer.
Use the undo dldp delaydown-timer
command to restore the default delaydown timer setting.
Example
# Set the delaydown timer to 2 seconds.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] dldp delaydown-timer 2
