Cisco Systems PA-E3, PA-2E3 manual Using the loopback Command to Verify the Physical Interface

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Checking the Configuration

each signal that is not returned before the specified timeout is displayed as a period (.). A series of exclamation points (!!!!!) indicates a good connection; a series of periods (.....) or the message [timed

out] or [failed] indicates that the connection failed.

Following is an example of a successful ping command to a remote server with the address 10.0.0.0:

router# ping 10.0.0.0 <Return> Type escape sequence to abort.

Sending 5, 100-byte ICMP Echoes to 1.1.1.10, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/15/64 ms router#

If the connection fails, verify that you have the correct IP address for the server and that the server is active (powered on), and repeat the ping command. Refer to the publications listed in the “Related Documentation” section on page vi for complete descriptions of interface subcommands and the configuration options available for VIP2-related interfaces, and to determine which subcommands and configuration options support VIP2 functionality.

Using the loopback Command to Verify the Physical Interface

Use the loopback {dte local network {line payload} command to troubleshoot the E3 serial port adapter at the physical interface level. The command loops all packets from the E3 interface either back to the interface or from the network back out toward the network. Use the no form of the command to remove the loop.

The following examples of the loopback {dte local network {line payload} command configure loopback modes on the single interface (interface 0) of a one-port E3 serial port adapter in port adapter slot 0 of a VIP2 in chassis slot 10 of a Cisco 7500 series router:

•Set the interface into loopback data terminal equipment (DTE) mode as follows:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

router(config)# interface serial 10/0/0

router(config-if)# loopback dte

Loopback DTE loops the router output data back toward the router (after the line interface unit).

•Set the interface into local loopback mode as follows:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

router(config)# interface serial 10/0/0

router(config-if)# loopback local

Local loopback loops the router output data back toward the router at the framer.

•Set the interface into network line loopback mode as follows:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

router(config)# interface serial 10/0/0 router(config-if)#loopback network line

Network line loopback loops the data back toward the network (before the framer).

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Contents PA-E3 Serial Port Adapter Installation and Configuration Corporate HeadquartersPage Organization PrefaceObjectives Section Title DescriptionRelated Documentation Related Documentation Section Title DescriptionRelated Documentation Cisco Connection Online Documentation CD-ROMCisco Connection Online Overview Port Adapter OverviewPort Adapter Overview One-Port PA-E3 Serial Port AdapterManagement Information Base PA-E3 Serial Port Adapter FeaturesPA-E3 Serial Port Adapter Features PA-E3 Port Adapter LEDsPA-E3 Port Adapter LEDs PA-E3 Receptacles and CablesPA-E3 Receptacles and Cables Name Color State DescriptionInteroperability Guidelines for PA-E3 DSUs 6PA-E3 Serial Port Adapter Installation and Configuration Preparing for Installation Parts and Tools RequiredSoftware and Hardware Requirements Software and Hardware RequirementsPA-2E3 Safety Guidelines Safety Guidelines4PA-E3 Serial Port Adapter Installation and Configuration Preventing Electrostatic Discharge Damage Telephone Wiring GuidelinesElectrical Equipment Guidelines Electrical Equipment GuidelinesITI-T Compliance Compliance InformationBabt Compliance TBR24 ComplianceVIP2 and the PA-E3 OverviewOverview Dimm U5PA-E3 in port adapter Slot PA-E3 in port adapter slot Removing a Port Adapter Removing a Port AdapterInstalling a Port Adapter Installing a Port AdapterAligning a Port Adapter in a Port Adapter Slot H3152 8PA-E3 Serial Port Adapter Installation and Configuration Catalyst RSM/VIP2 and the PA-E3 Port adapter securing screw Removing a Port Adapter Installing a Port Adapter Aligning a Port Adapter in a Port Adapter Slot 6PA-E3 Serial Port Adapter Installation and Configuration Cisco 7200 Series and the PA-E3 Cisco 7206 with a PA-E3 in Port Adapter SlotPort adapter Handle Lever unlocked Position Handling a Port Adapter Port adapter Handle Cisco uBR7200 Series and the PA-E3 Port adapters Port adapters Port adapter lever in unlocked position Inside slot guide PC board Metal carrier Port adapter retention clip in locked position 6PA-E3 Serial Port Adapter Installation and Configuration Installation Overview Cisco 7100 Series and the PA-E3Cisco 7140 Series Router-Port Adapter Slot 4 Location Installing a Port Adapter Guides Configuring the PA-E3 Interfaces Using the Exec Command InterpreterCisco 7200 Series and Cisco uBR7200 Series Ports Cisco 7200 Series and Cisco uBR7200 Series Ports Cisco 7206 Serial Port Number ExampleVIP2 Ports PA-E3 Interface Port Address Example- Cisco uBR7246 ShownCatalyst RSM/VIP2 Ports Catalyst RSM/VIP2 PortsRoute Switch Module Cisco 7100 Series PortsWith port adapters Performing a Basic Configuration Performing a Basic ConfigurationConfiguration Example Configuration ExampleCustomizing the PA-E3 Setting the Bandwidth Setting the BandwidthDefining the DSU Mode Defining Set Bit NationalConfiguring Cyclic Redundancy Checks Setting the Cable LengthConfiguring Cyclic Redundancy Checks Specifying E3 FramingUsing show Commands to Verify Status Checking the ConfigurationChecking the Configuration Checking the Configuration Step NumberRouter# show interfaces serial 2/0 14PA-E3 Serial Port Adapter Installation and Configuration Router# show controllers serial 0/1 Serial0/1 16PA-E3 Serial Port Adapter Installation and Configuration 73-1684-03 18PA-E3 Serial Port Adapter Installation and Configuration Using the ping Command to Verify Network Connection Using the ping Command to Verify Network ConnectionUsing the loopback Command to Verify the Physical Interface Using the loopback Command to Verify the Physical Interface 22PA-E3 Serial Port Adapter Installation and Configuration
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