Troubleshooting guide

5-4
ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-02
Chapter 5 Troubleshooting Switch Router ATM Interface Connections
Performing Basic Interface Checks
Use the following steps to check the cell rate of the interface:
Step 1 Use the show atm interface atm command to display information about an interface.
Switch# show atm interface atm 1/0/0
Interface: ATM1/0/0 Port-type: oc3suni
Status: UP Admin Status: up
Auto-config: enabled AutoCfgState: completed
IF-Side: Network IF-type: NNI
Uni-type: not applicable Uni-version: not applicable
Max-VPI-bits: 8 Max-VCI-bits: 14
Max-VP: 255 Max-VC: 16383
ConfMaxSvpcVpi: 255 CurrMaxSvpcVpi: 255
ConfMaxSvccVpi: 255 CurrMaxSvccVpi: 255
ConfMinSvccVci: 33 CurrMinSvccVci: 33
Svc Upc Intent: pass Signalling: Enabled
ATM Address for Soft VC: 47.0091.8100.0000.0040.0b0a.2a81.4000.0c80.8000.00
Configured virtual links:
PVCLs SoftVCLs SVCLs TVCLs PVPLs SoftVPLs SVPLs Total-Cfgd Inst-Conns
4 0 0 0 0 0 0 4 4
Logical ports(VP-tunnels): 0
Input cells: 528135 Output cells: 528235
5 minute input rate: 0 bits/sec, 0 cells/sec
5 minute output rate: 0 bits/sec, 0 cells/sec
Input AAL5 pkts: 344844, Output AAL5 pkts: 344878, AAL5 crc errors: 0
Switch#
Step 2 Check the IF (interface) Status and Admin (administration) Status fields to see whether they are up.
If down, check for the following:
• Disconnected or faulty cabling—Check cables.
• Hardware failure—Swap hardware.
If administratively down, the interface has been administratively taken down. Use the no shutdown
interface configuration command to reenable the interface.
Step 3 Check the Input cells and Output cells fields. If the errors and the input and output difference exceed
0.5 to 2.0 percent of traffic on the interface, the interface is experiencing congestion and dropping cells.
Step 4 Check the AAL5 CRC errors field. If the errors and the input and output difference exceed 0.5 to 2.0
percent of traffic on the interface, check for the following:
• Many CRC errors, but not many collisions. This indicates excessive noise.
• Cable damage. If you are using UTP cables, make sure you are using category 5 cable and not
another type, such as category 3.
If you determine that the physical interface is configured incorrectly, refer to the “Configuring
Interfaces” chapter in the ATM Switch Router Software Configuration Guide for configuration
information. If you still have not determined the problem, continue with the next phase of basic interface
troubleshooting.