How do you do a loopback test on Cisco?
How do you do a loopback test on Cisco?
Cable Run Test
- Remove the loopback plug from the VWIC port.
- Connect the cable to the VWIC port.
- Disconnect the cable from SmartJack.
- Plug the loopback to that end of the cable run.
- Perform loopback tests.
How do I test my loopback Ethernet?
External loopback test—Tests the hardware of Ethernet interfaces. To perform an external loopback test on an Ethernet interface, connect a loopback plug to the Ethernet interface. The device sends test packets out of the interface, which are expected to loop over the plug and back to the interface.
When to use a loopback plug on a router?
The hardware loopback plug test is used to see if the router and the entire CSU/DSU has any faults. If a router passes a hardware loopback plug test, then the problem exists elsewhere on the line. Refer to the directions below for creating a loopback plug, and then insert the plug into the network (telco) side of the CSU/DSU.
How to loop T1 channels in Cisco 7000 router?
To loop individual T1 channels on the CT3IP in Cisco 7000 series routers that have the RSP7000 and RSP7000CI and in Cisco 7500 series routers, use the loopback command in interface configuration mode. To remove the loopback, use the no form of this command.
How to loop the T3 line on a Cisco router?
To loop the entire T3 (all 28 T1 channels) line on the T3 controller or E3 (all 16 E1 channels) in Cisco NCS 4200 Series or on the CT3IP in Cisco 7500 series routers, use the loopback command in controller configuration mode. To remove the loop, use the no form of this command. loopback { local | network { line | payload } | remote }
How is loopback testing used in Cisco gateways?
Loopback testing is a very effective way to isolate a failing T1 (or E1). The basic idea behind loopback testing is: Start at the Voice/WAN Interface Card (VWIC) on the Cisco gateway.