Cisco Networks: Engineers' Handbook of Routing, Switching, and Security with IOS, NX-OS, and ASA

© Chris Carthern and William Wilson and Noel Rivera 2021

C. Carthern et al.Cisco Networkshttps://doi.org/10.1007/978-1-4842-6672-4_8

8. Basic Switch and Router Troubleshooting

Chris Carthern¹  , William Wilson² and Noel Rivera³

(1)

Bangkok, Krung Thep, Thailand

(2)

FPO, AP, USA

(3)

APO, AE, USA

 

This chapter discusses troubleshooting concepts that aid in resolving network issues. These concepts include maintaining up-to-date documentation and how to systematically isolate network issues and correct them. We start with the physical medium, as many engineers simply ignore this layer, but you will be shown why it is important. The chapter provides examples and steps that can be used to resolve issues dealing with VLANs, trunking, EtherChannels, VTP, STP, ...