![]() ![]() In addition, the test must be performed with each individual network. It is important to remember that the TXD pins must be connected to both the TXD and the receiver. The TXD pins must be connected to the RXD, while the RXD should be connected to the TXD. Typically, the TXD pins are connected to the RXD, whereas the RXD is connected to the TXD. In simple terms, the loopback test is a method that routes electronic signals or digital data streams back to their source. Some devices come with built-in loopback capabilities. It is usually used with a special testing device that sends specific patterns and counts errors. The loopback test is an important tool in troubleshooting. A moving looping connection is an additional cable that can be connected to the device and is a useful option for modem link tests. The result is that the device will receive exactly what it sends. It works by connecting the transmit pin to the receive pin. The loopback test can be performed on serial communications transceivers. You can use any type of loopback tester to perform a loopback test. Before performing a loopback test, make sure that your computer’s loopback plug is installed correctly. ![]() It is also safe to use in home environments. It is an essential procedure for diagnosing network issues and testing the integrity of transmission paths and equipment. The loopback test is a diagnostic process that involves transmitting a signal and receiving it back. For this reason, loopback tests are often used to debug problems with a physical connection or fiber optic network. It also helps identify any problems with the hardware, cable, or software that is causing the failure. If one of the signals is not sent back to the other, then the test is considered a failure. It involves sending a digital data stream and receiving it back. I think at that point you would be good to go.A loopback test is a common procedure used in telecommunications, particularly fiber optic networks. To rectify your situation you can add frame relay map statements to the EAST and WEST mapping their serial IP address to the same DLCI as you did for the HQ serial ip. My guess is that this will successfully ping. Now you have controlled what the source IP is for the ping packet. So specify the IP address of one of the loopbacks on the EAST. Then hit Y and then it will ask you for the source ip address or interface Then take the defaults for everything UNTIL it says Extended Commands So make sure you select IP for the protocol and specify the correct target IP address. Then it will prompt you for several things. So from the EAST type ping and hit enter. If you were to try an extended ping I think you would have success. So now when the ping reaches the the loopback on the EAST it tries to return the packet destined to 172.16.124.3, but there is nothing in the frame relay map for. So when you ping the EAST loopback you are sourcing it with the 172.16.124.3 ip address. When you issue a ping command like you did from the router, the router uses the ip address of the outbound interface to source the ip packet. Sending 5, 100-byte ICMP Echos to 10.2.3.1, timeout is 2 seconds: Ia - IS-IS inter area, * - candidate default, U - per-user static route I - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2Į1 - OSPF external type 1, E2 - OSPF external type 2 The hub is HQ and spokes are EAST & WEST, I can't ping the loopback of router EAST from the router WEST and the reverse as well, the topology is like this:Ĭodes: C - connected, S - static, R - RIP, M - mobile, B - BGPĭ - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area Hello i have a problem with eigrp, i configured eigrp through a frame relay cloud, hub and spokes
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