H3C S7500E Series Configuration Manual

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H3C S7500E Series Configuration Manual Manual pdf 22 page image

1-15To do… Use the command… RemarksSet the delay time for the linklayer to report a link-down eventof an IRF virtual deviceirf link-delay interval OptionalThe default value is 200 ms.Do not set the time interval to a very long time; otherwise, the IRF virtual device cannot be aware of thetopology changes in time and thus services will be recovered slowly.Configuring MAD DetectionAn IRF virtual device with distributed devices as its member devices supports two MAD approaches:BFD MAD detection and LACP MAD detection. The LACP MAD detection requires intermediatedevices, which must be capable of identifying and processing LACPDU protocol packets carrying ActiveID values; the BFD MAD detection requires either direct connection or intermediate devices.Enabling BFD MAD detection1) BFD MAD detection mechanismBFD MAD is implemented with the BFD protocol. To configure BFD MAD detection, configure a MAD IPaddress on a BFD-enabled Layer 3 interface for each member device. This MAD IP address identifiesthe member during BFD MAD detection. The MAD IP addresses assigned to the member devices mustbelong to the same network segment.z When the IRF virtual device operates normally, only the MAD IP address of the master is effectiveand the BFD session is down.z When the IRF virtual device partitions, the MAD IP addresses of the masters in different IRF virtualdevices become effective to activate the BFD sessions to detect for multi-active IRF virtual devicecollision.2) Network requirementsBFD MAD detection can be achieved with or without intermediate devices. The commonly usednetworking diagram is as shown in Figure 1-6: there must be a BFD MAD detection link among allmembers, and the interfaces connected by this link must belong to the same VLAN. In VLAN interfaceview, assign different IP addresses on the same network segment for different member devices.A Layer 3 interface used for BFD MAD must be dedicated. Do not configure any other services on aLayer 3 interface with BFD MAD enabled. Otherwise, both the configured services and the BFD MADdetection function may be affected.