Category Archives: Cisco Networking

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TDR functionality within Cisco IOS high-end Switches

  This document introduces a nice features in IOS that is not very commonly know: a time domain reflectometer functionality on the SwitchPorts!

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A fresh look on Anycast Addressing..

explanation-anycast

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A case study of DHCP snooping and IP Source Guard

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TCPdump compatible traces in IOS

This post will show how to perform LibPcap snooping on IOS devices. Two types of IOS routers (7200 and csr1000v) are covered in the document.

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VTP v.3 Study

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Prio field STP within the BID of the BPDU

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A Cisco FLEXLINK STUDY

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Router Failover Configuration with BGP and NAT with two ISPs

This is for the more hard core Cisco IOS users: With multi-homed BGP you can let your router failover internet service providers. You can track their availability with SLA, or simply let BGP do its thing. The thing that had … Continue reading

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The Cisco – IOS CLI menu structure

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An STP example within GNS3

Configuring a Spanning Tree in GNS3: ———————————— I found that configuring the SPT  was always a bit vague due to the fact that dynamips / dynagen emulate Cisco IOS Routers, not switches. I didn’t find a simple example that tells … Continue reading

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