R21xx-HP FlexFabric 11900 High Availability Configuration Guide

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Setting the port shutdown mode
On detecting a unidirectional link, the ports can be shut down in one of the following two modes.
• Auto mode—When a unidirectional link is detected, DLDP changes the DLDP port state to
Unidirectional. The unidirectional port periodically sends RecoverProbe packets. When a correct
RecoverEcho packet is received, the link between the local port and the neighbor is restored to a
bidirectional link, and the port will transit from Unidirectional state to Bidirectional state. This
process is called "link auto-recovery mechanism."
• Manual mode—When a unidirectional link is detected, DLDP does not shut down the port, and you
need to manually shut down the port. When the link state is restored to Bidirectional, you must
manually bring up the port. If the network performance is low, the device is busy, or the CPU usage
is high, normal links might be treated as unidirectional links. In this case, you can set the port
shutdown mode to manual mode to alleviate the impact caused by false unidirectional link report.
To set port shutdown mode:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Set port shutdown mode.
dldp unidirectional-shutdown
{ auto | manual }
The default mode is auto.
Configuring DLDP authentication
You can guard your network against attacks and malicious probes by configuring an appropriate DLDP
authentication mode, which can be plain text authentication or MD5 authentication. If your network is
safe, you can choose not to authenticate.
To configure DLDP authentication:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Configure a DLDP
authentication mode.
dldp authentication-mode { md5 |
none | simple }
The default authentication mode is
none.
3. Configure the password for
DLDP authentication.
dldp authentication-password
{ cipher cipher | simple simple }
By default, no password is
configured for DLDP
authentication.
If you do not configure the
authentication password after you
configure the authentication mode,
the authentication mode is none no
matter which authentication mode
you configure.
Displaying and maintaining DLDP
Execute display commands in any view and the reset command in user view.