Tag Archives: Cisco IOS

Default Port and VLAN Configuration/Behavior on Cisco IOS switches

In this short lab, I use two Cisco Catalyst 3550 switches [IOS 12.2(44)SE6] to demonstrate the default port and VLAN behavior on a Cisco switch running IOS. Below is the network diagram for this lab.

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Gratuitous ARP and Basics of Connecting a Cisco IOS Switch with a Cisco CatOS Switch

Some of you may have an old Cisco Catalyst switch laying around that you may want to put to use. CatOS is the old Cisco operating system for Catalyst switches that predates IOS; it can still be found on some … Continue reading

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OSPF Explained and Useful Troubleshooting Commands

Open Shortest Path First (OSPF) is an open standard link-state routing protocol that supports multiple equal-cost routes to the same destination (four by default). OSPF constructs a shortest path tree and then updates the routing table with the best paths. … Continue reading

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