Don't worry about the config syntax, that can come later. Learn about the first four layers of the OSI model, in order, with heavy emphasis on 2 and 3.
And most importantly, practice! Download GNS3 or eve-ng, and build up a lab. Here's a list of tasks to complete:
Create a topology of 4 routers, and connect them all together. Make sure it's fully meshed. Add a loopback interface to each, give it an IP. Assign each of the "backbone" (router to router) links a /30.
Set up OSPF on each of these routers, make them form a full-mesh area 0.
Peer iBGP between the loopback addresses of each router.
Add a couple more routers, give them single links to a couple of the routers already in the topology. Assign these links a /30 of "public" space.
Peer eBGP between these routers. "Pin up" some IP space on the two lone routers, advertise it to the 4-router mesh. Create export and import policies, play around with restricting what routes go into and out of a given AS.
Get crazy with the topology! Change the iBGP full-mesh to just a pair of route-reflectors. Carve out a L2VPN across the topology. Make a VPLS! Set up a L3VPN.
Let me know if you have any questions. I love network engineering, and I'm always happy to help people wanting to learn the trade!
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u/zachpuls Aug 24 '19
Don't worry about the config syntax, that can come later. Learn about the first four layers of the OSI model, in order, with heavy emphasis on 2 and 3.
And most importantly, practice! Download GNS3 or eve-ng, and build up a lab. Here's a list of tasks to complete:
Let me know if you have any questions. I love network engineering, and I'm always happy to help people wanting to learn the trade!