Understanding Shortest Path First
Link state protocols like OSPF and IS-IS use the Shortest Path First (SPF) algorithm developed by Edsger Dijkstra. Edsger was […]
Routing
OSPF
OSPF
Not All OSPF Inter-area Traffic Traverses Interfaces In Area 0
Everyone knows that OSPF is a link state protocol. Those that study also discover that OSPF behaves like distance vector
OSPF
Why Are OSPF Type 5 LSAs Flooded?
I recently saw a great question on Reddit, on why Type-5 (AS-external) LSAs are flooded, in comparison to Type-3 (Summary)
BFD
Why Is BFD More Light Weight Than Routing Hellos?
There are many articles on BFD. It is well known that BFD has the following advantages over routing protocol hellos/keepalives:
BGP, OSPF
Is One Protocol Simpler Than Two?
I’ve been in a lot of interesting discussions the last couple of days on what protocol to use for the
VXLAN
Choosing the Underlay Protocol in a VXLAN Network
When building a VXLAN network, what are the considerations for choosing the underlay protocol such as OSPF, IS-IS, or BGP?
OSPF
Unnumbered Links In OSPF
This post is going to be a real deep dive! First, I want to send my sincere thanks to the
VXLAN
Building a VXLAN Lab Using Nexus9000v
As I dive into the world of VXLAN, I will need a lab as that is the best way to
VXLAN
Introduction to VXLAN
In the previous post, we looked at some of the challenges with L2-based networks. Now let’s start diving into what
OSPF
OSPF Convergence In a Hub and Spoke Topology
My dear friend Micheline Murphy posted an excellent question on OSPF in a Hub and Spoke topology at the Cisco