By default, the BERT period is 10 seconds.Ĭonfigure the error rate to monitor when the inbound pattern You can configure the BERT period to last from 1 throughĢ39 seconds on some PICs and from 1 through 240 seconds [edit interfaces interface-name bert-period seconds You can include this statement at the following hierarchyĬonfigure the duration of the test. To configure loopback testing, include the loopback statement: loopback mode IQ and IQE Interfaces (SONET Mode), Configuring Fractional E1 IQĪnd IQE Interfaces, and Configuring Channelized T3 IQ InterfacesĬapability to Identify a Problem as Internal or ExternalĬonfiguring T1 Loopback Capability and Configuring T3 Loopback Capability NxDS0 IQ and IQE Interfaces, Configuring T1 and NxDS0 Interfaces, Configuring Channelized OC12/STM4 Loopback modes supported on the various interface types.Īggregated Ethernet, Fast Ethernet, Gigabit EthernetĬonfiguring E1 Loopback Capability and Configuring E3 Loopback Capability This loopback tests all the intermediate transmission segments. Those packetsĪre then retransmitted by the PIC back toward the CSU and the circuit. Physical circuit and CSU are received by the interface. When you configure a remote loopback, the packets received from the A router at oneĮnd of the circuit initiates a remote loopback toward its remote partner. Loopback loops packets, including both data and timing information,īack on the remote router’s interface card. Problems between the local router and the remote router. Remote-Useful for troubleshooting the physical circuit Payload loopback loops data only (without clocking information) on Payload-Useful for troubleshooting the physicalĬircuit problems between the local router and the remote router. Received by the PIC, the Device Flags field contains the If PPP keepalives transmitted on the interface are Issue the show interfaces interface-name command. The data received from the CSU is ignored. Which includes data and timing information, on the local router's The interface receives its own transmission, Packets to the channel service unit (CSU) and then to the circuit Local-Useful for troubleshooting physical PIC errors.Ĭonfiguring local loopback on an interface allows transmission of The following types of loopback testing are supportedĭCE local-Loops packets back on the local data circuit-terminatingĭCE remote-Loops packets back on the remote DCE. Loopback closer to the local router to find the source of the problem. In this case, the next troubleshooting step is to configure a line Layer packets, you can assume that the problem is on one of the segmentsīetween the local router and the remote router’s interface card. If this originating router does not receive its own Data Link Next, configure a line loopback farther away from the local Layer packets, you have verified that the problem is beyond the originating If the originating router receives back its own Data Link Instead of transmitting the signal toward theįar-end device, the line loopback sends the signal back to the originating Loopback tests allow you to isolate segments If a circuit fault occurs in theįorm of a line break or a signal corruption, you can isolate the problemīy using a loopback test. The transmit path on one device connects to the Of segments interconnected by devices that repeat and regenerate the The physical path of a network data circuit usually consists You can configure any of the following interfaces to executeĪ loopback test: aggregated Ethernet, Fast Ethernet, Gigabit Ethernet,Į1, E3, NxDS0, serial, SONET/SDH, T1, and T3. Loopback testing allows you to verify the connectivity of aĬircuit.
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