H3C S5120-EI Series Configuration Manual

Also see for S5120-EI Series: Configuration guide Installation manual Configuration guide Configuration guide Operation manual

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H3C S5120-EI Series Configuration Manual Manual pdf 52 page image

43If the device is busy, or the CPU usage is high, normal links may be treated as unidirectional links. In thiscase, you can set the port shutdown mode to manual mode to alleviate the impact caused by falseunidirectional link report.To set port shutdown mode:Step Command Remarks1. Enter system view. system-view N/A2. Set port shutdown mode. dldp unidirectional-shutdown{ auto | manual }Optional.auto by default.Configuring DLDP authenticationYou can guard your network against attacks and malicious probes by configuring an appropriate DLDPauthentication mode, which can be simple authentication or MD5 authentication. If your network is safe,you can choose not to authenticate.To enable DLDP to operate properly, make sure that DLDP authentication modes and passwords on bothsides of a link are the same.To configure DLDP authentication:Step Command Remarks1. Enter system view. system-view N/A2. Configure DLDPauthentication.dldp authentication-mode { none |{ md5 | simple } password } none by default.Resetting DLDP stateAfter DLDP detects a unidirectional link on a port, the port enters Disable state. In this case, DLDP promptsyou to shut down the port manually or it shuts down the port automatically depending on the user-definedport shutdown mode. To enable the port to perform DLDP detect again, you can reset the DLDP state ofthe port by using one of the following methods:• If the port is shut down with the shutdown command manually, run the undo shutdown commandon the port.• If DLDP automatically shuts down the port, run the dldp reset command on the port to enable theport to perform DLDP detection again. Alternatively, you can wait for DLDP to automatically enablethe port when it detects that the link has been restored to bidirectional. For how to reset the DLDPstate by using the dldp reset command, see "Resetting DLDP state in system view" and "ResettingDLDP state in interface view/port group view."The DLDP state that the port transits to upon the DLDP state reset operation depends on its physical state.If the port is physically down, it transits to Inactive state; if the port is physically up, it transits to Activestate.Resetting DLDP state in system viewResetting DLDP state in system view applies to all ports of the device.To reset DLDP in system view: