Troubleshooting guide

8-18
Cisco Broadband Local Integrated Services Solution Troubleshooting Guide
OL-5169-01
Chapter 8 Troubleshooting the Cisco Catalyst 6509
Troubleshooting Serial Lines
Both line and internal do the following
• Loop any data received at the OC-12 POS card’s network interface back into the network
• Loop any data received at the OC-12 POS card’s network interface back into the PRE card
Use the no form of the command to stop the loopback test.
In the following example, a loopback is set for the OC-12 POS line card in slot 5:
Router(config)# interface pos 5/0/0
Router(config-if)# loopback line