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related to network topics such a routing and switching. may include also some topics related to doing qos infrastructure management and administration

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  • Point-to-Point OSPF Network Operation over a LAN that connects multiple routers
    What happens when LAN interfaces are configured as point-to-point network type OSPF interfaces instead of default broadcast type? And more than 2 ospf routers are present on this media? Let’s test this on network (R1, R2, R3): Routers are Cisco 7206VXR GNS3 emulated and run C7200 ADVENTERPRISEK9-M IOS version 15.3(3)XB12. They are configured as: R1
  • VPNv4 BGP AS-Override Feature into play!
    Let’s put into play AS-Override feature in BGP: see when it applies and how it works. First, AS-Override feature applies to sites that have the same AS number but are linked by another different domain with different AS number, as in the next figure. In our example AS number 1 has neighborship (E-BGP links) to
  • EIGRP over a vNET trunk
    In this blog we’ll explore the operation of IGP interior routing protocol EIGRP over vNET trunks (another way to say networking trunking similar to vlan trunks used in L2 network by switches to trunks multiple traffics from different vlans into the same physical link) little introduction New IOS release 15.x introduced Easy Virtual Network (EVN)
  • At the begining, … it was not DMVPN!
    The simplest way to interconnect 3 or more routers in the same broadcast domain (and the same subnet) is by attaching them to a switch (or hub) in the same vlan. In case they’re separated by long distances, an ISP may be required to put them together. From a network access perspective, they could be
  • Vlan propagation and Cisco FabricPath
    In this post, we explore the operation of Cisco FabricPath (FP) and more specifically Vlan information propagation in this fabric in comparison with other platforms: Catalyst for example from the same vendor. The case is to learn how the switches that are part of the LAN network learn about and support Vlan operation: is there
September 2025
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