Routing Protocols in Depth
Past one static route and one OSPF adjacency, into the protocols as they actually behave - what they exchange, how they choose, and the specific ways each one fails while looking healthy.
By the end you will be able to
- Diagnose an OSPF adjacency from its state rather than by guessing
- Explain what EIGRP checks before it accepts a backup route
- Say why an established BGP session might carry no prefixes at all
- Predict which route a router installs when three sources offer the same destination
- Recognise a backup path that has been carrying live traffic all along
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Modules
- 01
Static Routing at Scale
Three LANs, then summarisation, then a hub and spokes. Where writing routes by hand stops being one line and starts being a design.
4 activities~80 min - 02
When a Static Route Does Not Work
Four routes that are present in the configuration and wrong in the table. Each one fails differently, and each failure is diagnosable.
4 activities~80 min - 03
OSPF in One Area
Neighbour, database, calculation. The sequence, then three labs where one stage of it is missing.
5 activities~79 min - 04
OSPF Areas, and Two Faults That Look Alike
Why areas exist, and the two mismatches that both present as "the link is up and the neighbours will not form".
4 activities~71 min - 05
EIGRP and the Feasible Successor
A protocol that keeps a spare route verified in advance, and the one condition a spare must satisfy before it is allowed to be used.
5 activities~90 min - 06
BGP Between Networks
Routing between organisations, where the shortest path is frequently the one you least want. Six labs, four of which are established sessions behaving in ways an interior protocol never would.
8 activities~139 min - 07
When Sources Disagree
A router offered the same destination three times installs one of them. The order of the three tests, the protocols that lose, and the gateway that is itself a single point of failure.
7 activities~105 min - 08
Knowing What Is Actually Plugged In
Documentation goes stale; a discovery protocol cannot. Read the real topology off the devices, then fix routing that was written from the wrong one.
2 activities~34 min - 09
Slow, Not Broken
Every fault so far has been binary - a route exists or it does not, a port is open or filtered. This one is a link that is up, forwarding everything, and unusable.
2 activities~35 min
Curriculum topics
- Routing
- Dynamic Routing
- Troubleshooting
- OSPF
- High Availability
- Switching
Each topic page lists every lesson, quiz and hands-on lab that covers it, plus how it maps onto the CCNA and Network+ blueprints.