•
Use the show running-config spanning-tree command to verify that the Spanning Tree Protocol (STP)
is configured the same on all devices in the network.
•
Use the show processes | include ER command to verify that nonessential Layer 2 processes are in the
error state.
•
Use the show mac address-table dynamic vlan command to determine if learning or aging is occurring
at each node.
Verifying Layer 3 Connectivity
Answer the following questions to verify Layer 3 connectivity:
•
Have you configured a default gateway?
•
Have you configured the same dynamic routing protocol parameters throughout your routing domain
or configured static routes?
•
Are any IP access lists, filters, or route maps blocking route updates?
Use the following commands to verify your routing configuration:
•
show ip arp
•
show ip routing
See Troubleshooting Tools and Methodology, on page 93 to verify Layer 3 connectivity. See Troubleshooting
Routing, on page 63 for more information on troubleshooting Layer 3 issues.
Symptoms
This document uses a symptom-based troubleshooting approach that allows you to diagnose and resolve your
Cisco NX-OS problems by comparing the symptoms that you observed in your network with the symptoms
listed in each chapter.
By comparing the symptoms in this publication to the symptoms that you observe in your own network, you
should be able to diagnose and correct software configuration issues and inoperable hardware components so
that the problems are resolved with minimal disruption to the network. Those problems and corrective actions
include the following:
•
Identify key Cisco NX-OS troubleshooting tools.
•
Obtain and analyze protocol traces using SPAN or Ethanalyzer on the CLI.
•
Identify or rule out physical port issues.
•
Identify or rule out switch module issues.
•
Diagnose and correct Layer 2 issues.
•
Diagnose and correct Layer 3 issues.
•
Recover from switch upgrade failures.
•
Obtain core dumps and other diagnostic data for use by Cisco TAC or your customer support
representative.
Cisco Nexus 9000 Series NX-OS Troubleshooting Guide, Release 7.x
5
Overview
Verifying Layer 3 Connectivity
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