Cisco Cisco Nexus 7000 M1-Series 48-Port Fiber Gigabit Ethernet Module Guía Para Resolver Problemas

Contributed by Yogesh Ramdoss, Cisco TAC Engineer.

Sep 11, 2013

Introduction 
Fabric CRC Detection Overview
     Understand the Different Fabric CRC Errors
     Fabric CRC Troubleshoot Approach
     General CRC Troubleshoot Guidelines
Case Studies
     Ingress Module Corrupts the Packets
        Logs
        Problem
        Probable Cause of the Problem
        Faulty Component Isolation Process
     Mis-Seated XBAR Injects Corrupt Packets
        Logs
        Problem
        Probable Cause of the Problem
        Faulty Component Isolation Process
     Faulty Egress Module Corrupts Packets from the Fabric
        Logs
        Problem
        Probable Cause of the Problem
        Faulty Component Isolation Process
Troubleshoot Commands

This document describes how to resolve fabric errors reported in the Cisco Nexus 7000 platform. A
troubleshoot of fabric Cyclic Redundancy Checksums (CRCs) involves the collection of data, data analysis,
and an elimination process in order to isolate the problem component. This document covers the most
common types of fabric CRC errors.

Here is a high-level diagram of a Nexus 7018 fabric module with M1 linecards: