#Ethernet loopback serial#
#Ethernet loopback software#
#Ethernet loopback Pc#

RP/0/RSP0/CPU0:ASR9001-F(config-if)# loopback external This test requires a length of fiber cable to physically loop the transmit (Tx) signals into the receive (Rx) port. This test verifies the linecard Central Processing Unit (CPU), fabric path, NP, transceiver, and optics. Output good pkts = 10003 Output unicast pkts = 10000 Input good pkts = 10003 Input unicast pkts = 10000 Statistics for interface TenGigE0/0/1/1 (cached values): Output 0 broadcast packets, 3 multicast packetsĠ output errors, 0 underruns, 0 applique, 0 resetsĠ output buffer failures, 0 output buffers swapped outĬheck the Controller Counters RP/0/RSP0/CPU0:ASR9001-F# show controllers tenGigE 0/0/1/1 stats Received 0 broadcast packets, 3 multicast packetsĠ input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abortġ0003 packets output, 15140657 bytes, 0 total output drops Last clearing of 'show interface' counters 00:02:40ĥ minute input rate 685000 bits/sec, 126 packets/secĥ minute output rate 685000 bits/sec, 126 packets/secġ0003 packets input, 15140657 bytes, 0 total input dropsĠ drops for unrecognized upper-level protocol Output flow control is off, input flow control is off Hardware is TenGigE, address is 65 (bia 65) TenGigE0/0/1/1 is up, line protocol is up Success rate is 100 percent (10000/10000), round-trip min/avg/max = 1/1/5 msĬheck Interface Counters RP/0/RSP0/CPU0:ASR9001-F# show interfaces tenGigE 0/0/1/1 Pings with timeout=0 may result in system instability andĬontrol protocol flaps resulting in traffic impact.ĭO you really want to continue : y RP/0/RSP0/CPU0:ASR9001-F# clear counters tenGigE 0/0/1/1Ĭlear 'show interface' counters on this interface This clears counters on both the interface and controller. RP/0/RSP0/CPU0:ASR9001-F(config-if)# end Clear Counters RP/0/RSP0/CPU0:ASR9001-F(config-if)# loopback internal This is traffic impacting RP/0/RSP0/CPU0:ASR9001-F# configure It can find problems with the CPU, fabric path, NP and transceiver, but it cannot find optical or transit problems. This is a basic test that can be performed without access to a remote site. The below examples use this interface: RP/0/RSP0/CPU0:ASR9001-F# show run int tenGigE 0/0/1/1 Internal loops can be done remotely, but don't provide as much information.Įxternal loops must be performed at the site, but give the greatest amount of information. There are two primary kinds of loopbacks: internal and external. When necessary, loopbacks can be used to find problems with line cards, fabric, Network Processors (NPs), transceivers, or optical transit paths. Review the interfaces status to confirm the working status of all ports on the switch.Using Loopbacks to Test Ethernet Interfaces.

#Ethernet loopback software#

Check the software version of the switch.

Connect your transceiver with one simplex fiber cable or loopback cable, such as LC fiber cable or LC loopback cable.

You can plug the loopback plug into the NIC and verify that signals can be sent and received with the plug. Loopback plugs are commonly used to check NICs. Cable testers are used to check characteristics of a cable.

What component is a loopback plug used to test?Ī loopback plug is used to check a NIC.

#Ethernet loopback serial#

Telecommunications, serial interfaces, virtual network interfaces and networking all implement loopback techniques. Loopback plugs are generally used to route electronic signals and digital data streams from the source back to the same origin to test data transmission. Under what circumstances might you use loopback plug? Strip the orange (1 & 2) pair of wires.

#Ethernet loopback Pc#

This is the same cable you use to connect your PC to the wall jack. It provides system test engineers a simple but effective way of testing the transmission capability and receiver sensitivity of network equipment. What kind of tools is loopback adapter?Ī loopback cable is also known as loopback plug or loopback adapter, which is a plug used to test physical ports to identify network issue.