3com S7906E 安装指导

 

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handles the problem accordingly. Use this function to avoid adding additional overhead to the system 

caused by the frequent link state changes of an interface in a short time. 

Follow these steps to set the delay time for the link layer to report a link-down event of an IRF: 

Enter system view 

— 

Set the delay time for the link 
layer to report a link-down 
event of an IRF 

irf link-delay interval 

Optional 

The default value is 200 ms. 

 

Do not set the time interval to a very long time; otherwise, the IRF system will not be aware of the IRF 

topology changes in time and thus the service will be recovered slowly. 

 

IRF of distributed devices supports two MAD approaches: BFD MAD detection and LACP MAD 

detection. The LACP MAD detection requires intermediate devices, which must be capable of 

identifying and processing LACPDU protocol packets carrying Active ID values; the BFD MAD detection 

requires either direct connection or intermediate devices. 

Network diagram for LACP MAD detection and BFD MAD detection are shown in 

 and 

 respectively. 

Figure 1-6 Network diagram for LACP MAD detection 

LACP MAD detection link

Device A

Device B

IRF link

Device C

（Intermediate device）

IRF