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In the preceding example, remote payload ANSI bit loopback sends a repeating 16-bit ESF data link code word (of 00010100 11111111) to the remote end requesting that it enter into a network payload loopback. Router(config-if)# loop remote payload fdl ansi There are three main loopback modes as follows: local, network (both line and payload), and remote (line and payload). Set the first T1 into remote payload FDL ANSI bit loopback, as follows: In the preceding example, remote line FDL ANSI bit loopback sends a repeating 16-bit ESF data link code word (of 00001110 11111111) to the remote end requesting that it enter into a network line loopback. Router(config-if)# loop remote line fdl ansi Set the first T1 into remote line FDL ANSI bit loopback, as follows: In the preceding example, remote line inband loopback sends a repeating 5-bit inband pattern (of 00001) to the remote end requesting that it enter into a network line loopback. Router(config-if)# loop remote line inband It is also sometimes referred to as RJ45. Set the first T1 into remote line inband loopback, as follows: An Ethernet loopback plug is a tool that can help troubleshoot problems with network connection or to test the Ethernet cables and networking hardware. The syntax of the loopback remote command follows: loopback In the preceding example, network payload loopback loops just the payload data back toward the network at the T1 framer. In such cases, one PacketExpert can be put in constant loopback at the remote end, and bit error rate tests can be started / stopped anytime at the local end.
#ETHERNET LOOPBACK TESTING MAC#
Router(config-if)# loopback network payload Layer 2 -Ethernet swaps Source and Destination MAC addresses Loopback facilitates end-to-end testing when the other end is in a remote place. Set the first T1 into network payload loopback as follows: Router# config t In the preceding example, network line loopback loops the data back toward the network (before the T1 framer). Set the first T1 into network line loopback as follows: Router# config t In the preceding example, local loopback loops the router output data back toward the router at the T1 framer and sends an AIS signal out toward the network. Set the first T1 into local loopback as follows:Įnter configuration commands, one per line. Specify the loopback format using the loopback command.Įxamples of specific loopback modes follow: There are three main loopback modes as follows: local, network (both line and payload), and remote (line and payload). Cisco Default Administratitve Distances.