User's Manual

14-8
14.4 EFM OAM Troubleshooting
When using EFM OAM, it occurs the problem, please check whether the problem is resulted by the following
reasons:
 Check whether OAM entities of two peers of link in passive mode. If so, EFM OAM connection can not
be established between two OAM entities.
 Ensuring SNMP configuration is correct, or else errored event can not be reported to network
management system.
 Link does not normally communicate in OAM loopback mode, it should cancel remote loopback in time
after detect the link performance.
 Ensuring the used board supports remote loopback function.
 Port should not configure STP, MRPP, ULPP, Flow Control, loopback detection functions after it
enables OAM loopback function, because OAM remote loopback function and these functions are
mutually exclusive.
 When enabling OAM, the negotiation of the port will be disabled automatically. So the negotiation in the
peer of the link must be disabled, otherwise the link connection will unsuccessful. When disabling OAM,
the negotiation of the port will be restored. Therefore, to ensure the link connection is normal, the
negotiations must be accordant in two peers of the link.
 After enabling OAM, when the link negotiations in two peers are successful, the state is up. After the
fiber in RX redirection of the peer is pulled out, TX of the peer and RX with OAM are normal, so the port
with OAM will be at up state all along.