H3C S5820X SERIES High Availability Configuration Manual

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H3C S5820X SERIES High Availability Configuration Manual Manual pdf 38 page image

26The relationship between the interval field value in the CCM messages, the interval between CCMmessages and the timeout time of the remote MEP is illustrated in Table 9.Table 9 Relationship of interval field value, interval between CCM messages, and timeout time of theremote MEPInterval field value Interval between CCMmessages Timeout time of the remote MEP3 100 milliseconds 350 milliseconds4 1 second 3.5 seconds5 10 second 35 seconds6 60 seconds 210 seconds7 600 seconds 2100 secondsConfiguring LB on MEPsThe LB function can verify the link state between the local MEP and the remote MEP or MIP.Follow these steps to configure LB on a MEP:To do... Use the command... RemarksEnable LBcfd loopback service-instanceinstance-id mep mep-id{ target-mep target-mep-id |target-mac mac-address } [ numbernumber ]RequiredDisabled by default.Available in any viewConfiguring LT on MEPsLT can trace the path between the source and target MEPs, and can also locate link faults by sending LTmessages automatically. The two functions are implemented in the following way:• To trace the path between the source MEP and target MEPs○ The source MEP first sends LTM messages to the target MEP.○ Based on the LTR messages in response to the LTM messages, the path between the two MEPscan be identified.• To locate link faults by sending LT messages automatically○ After LT messages automatic sending is enabled, if the source MEP fails to receive the CCMframes from the target MEP within 3.5 times the transmission interval, the link between the twois considered faulty and LTM frames—with the target MEP as the destination and the TTL field inthe LTM frames set to the maximum value 255—will be sent out.○ Based on the LTRs that the MIPs return, the fault source can be located.Follow these steps to configure LT on MEPs: