Cisco Catalyst 8500 Series Multiservice Switch Routers

Hardware Troubleshooting for Catalyst 8540/8510 MSRs and LightStream 1010 ATM Switch: Additional Information

Document ID: 21459

Updated: Jun 05, 2005


Additional Information


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Opening a TAC Case

Please provide the following output when opening a case with Cisco TAC to troubleshoot an ATM related problem:
  • What is the topology? What other devices feed into this ATM switch router?
  • Which interfaces have the highest traffic loads? Are these the same interfaces that are experiencing the rejected cells?
  • On which MSC chip are the rejected cells occurring? Is there a high amount of traffic flowing through this set of ports? For example, drops on MSC 0 point to a high amount of traffic on interfaces in slots 0 and 1.
  • Output from the following show commands:
    • show hardware
    • show running
    • show tech
    • show atm resource or show controller (depending on the platform)

Acronyms Used

The following acronyms are used throughout this document:
Acronym Description Acronym Description
ABR Available Bit Rate PCR Peak Cell Rate
ASIC Application-Specific Integrated Circuit PTI Payload Type Identifier
ASP ATM Switch Processor PVC Permanent Virtual Circuit
CLP Cell Loss Priority SCR Sustained Cell Rate
EFCI Explicit Forward Congestion Indication SP Switch Processor
EPD Early Packet Discard SuperCAM Super Carrier Module
FC-PCQ Feature Card Per-Class Queuing  SVCs Switched Virtual Circuits
FC-PFQ Feature Card Per-Flow Queuing TPD Tail Packet Discard
IE Information Element UBR Unspecified Bit Rate
ITPD Intelligent Tail Packet Discard UNI User-Network Interface
MIB Management Information Base UPC Usage Parameter Control
MSC Modular Switching Component VC Virtual Circuit
MSP Multiservice Switch Processor VCL Virtual Channel Link
OAM Operation, Administration and Maintenance VP Virtual Path
PAM Port Adapter Modules

Related Information

Updated: Jun 05, 2005
Document ID: 21459