Tag Archives: redundancy

Stacking the Dell MXL Blade Switch

The Data Center Bridging (DCB) enabled Dell MXL blade switch provides a 1/10/40GbE upstream solution for the Dell PowerEdge M1000e chassis. It comes with two fixed 40 GbE ports but is scalable up to six 40GbE ports via 40GbE FlexIO … Continue reading

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Multi-Area OSPF – Redundancy, Route Summarization, and LSA Filtering

In this lab, all routers except for R4 and R5 are Cisco 3725 routers [IOS 12.4(15)T10]. Routers R4 and R5 are Cisco 7200 routers [IOS 12.4(24)T]. Below is the network diagram for this lab.

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Single/Dual and Multihomed Connections

Network engineers will sometimes speak of connections to their ISP(s) in terms of single homed, dual homed, single multihomed, and dual multihomed. Here is a breakdown and clarification of what this terminology means: – Single Homed (1 link per ISP, … Continue reading

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Default STP Behavior on Cisco Switches

In a prior blog, Functionality of Layer 2 Switches/Bridges, I discussed the core functionality of layer 2 switches. In this blog, I hit upon the Spanning Tree Protocol (STP) used on layer 2 switches to prevent loops. As mentioned before, … Continue reading

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