H3C MSR Series Troubleshooting Guide

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Figure 8 Identifying whether the devices are commonly grounded well
Troubleshooting through looping
Common looping points
Figure 9 Common looping points (vice versa)
Looping point 1
Method: Execute the loopback local command on the E1 interface of the router, and execute the
fe1 loopback local command on the FE1 interface.
Purpose: Verify that the router interface can properly send and receive packets.
Looping points 2 and 3
Method: Short connect the Rx and Tx cables between Router1 and transmission device 1 or form a
leftwards loop on the transmission device.
Purpose: Verify that the line between Router1 and transmission device 1 is normal.
Looping point 4
Method: Form a leftwards loop on transmission device 2.
Purpose: Verify that the transmission network is normal.
Looping point 5
Method: Short connect the E1 Rx and Tx cables between Router1 and transmission device 1.
Purpose: Verify that the line whole physical link between Router1 and Router 2 is normal.
Looping point 6
Method: Execute the loopback remote/payload command on the E1 interface of Router 2, and
execute the fe1 loopback remote/payload command on the FE1 interface of Router 2.
Purpose: Verify that the whole link including Router 2 is normal.
Troubleshooting lines after looping
Use the self-loopback test function of the router to troubleshoot lines

H3C MSR Series Specifications

General

Category	Network Router
IPv6 Support	Yes
Dimensions	Varies by model
Weight	Varies by model
Product Type	Modular Router
Ports	Varies by model
WAN Interfaces	Varies by model
Firewall	Yes
QoS	Yes
Wireless Support	Varies by model
USB Ports	Varies by model
Console Port	Yes
Power Supply	Varies by model
Redundancy	Varies by model
Operating Temperature	0°C to 45°C
Storage Temperature	-40°C to 70°C
Humidity	5% to 95% non-condensing
Series	MSR
Certifications	CE, FCC, RoHS