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![]() 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. So rather than designing an external ethernet loopback we decided it would be better just to use an external PC.įinally, we are planning some additional network test functionality in V5 of BurnInTest (to better allow simultaneous testing of multiple network cards).Using Loopbacks to Test Ethernet Interfaces Any differences in the payload or an incorrect checksum will result in an error. ![]() Every time a packet is echoed from the remote host the checksum is verified and the data payload is compared byte by byte with the data that was sent. The packet sent to the remote host contains a data payload and a checksum. Up to 4 remote hosts can be selected by setting the Destination Network address in the Test Preferences window.ġ/ Setup an external machine on the same LANĢ/ Make sure there is no firewall blocking ICMP traffic (Network pings) on either the machine under test or the external machine.ģ/ Set the IP test address in the BurnInTest network test to use the IP address of the external machine. This allows the reliability of the network connection to be determined. This message is echoed but to your computer by a remote host. The ICMP_ECHO message is more commonly known as a ‘ping’. This is done by sending special ICMP_ECHO message using the Internet Control Message Protocol (ICMP). The Network test, tests your networking hardware and software. In V4 of BurnInTest, the network test can test the full data path, including the connector & cable.
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