Troubleshooting Guide

Chapter 6: Troubleshooting fundamentals
This section provides conceptual information and helpful tips for common problems.
Connectivity problems
Use the following general tasks to isolate connectivity problems:
• Check physical connectivity. Verify if an alarm for link or port down exists.
• Check the link state by viewing the show interface {gigabitEthernet|loopback|
vlan} command output.
• Use tools like ping or trace to verify if the connectivity issue is localized to an individual port or
VLAN.
• Try to localize the affected range of ports and slot.
If you contact technical support staff to help troubleshoot connectivity problems, always provide
source and destination IP pairs to facilitate in troubleshooting. Be sure to provide both working and
non-working pairs for comparison.
Example
VSP-4850GTS:1#show interface vlan
===============================================================================================
Vlan Basic
===============================================================================================
VLAN MSTP
ID NAME TYPE INST_ID PROTOCOLID SUBNETADDR SUBNETMASK VRFID
-----------------------------------------------------------------------------------------------
1 Default byPort 0 none N/A N/A 0
16 VLAN-16 spbm-bvlan 62 none N/A N/A 0
32 VLAN-32 spbm-bvlan 62 none N/A N/A 0
50 VLAN-50 byPort 0 none N/A N/A 0
60 VLAN-60 byPort 0 none N/A N/A 0
70 VLAN-70 byPort 0 none N/A N/A 0
90 VLAN-90 byPort 0 none N/A N/A 0
100 VLAN-100 byPort 0 none N/A N/A 0
102 VLAN-102 byPort 0 none N/A N/A 0
All 9 out of 9 Total Num of Vlans displayed
=============================================================================
Vlan Port
=============================================================================
VLAN PORT ACTIVE STATIC NOT_ALLOW
ID MEMBER MEMBER MEMBER MEMBER
-----------------------------------------------------------------------------
1
January 2017 Troubleshooting 25
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