Here are a couple recommendations. Interconnections - Radia Perlman. This is a good introduction to bridging and routing. Networking Algorithmics - George Var

Here are a couple recommendations. Interconnections - Radia Perlman. This is a good introduction to bridging and routing. Networking Algorithmics - George Varghese. This has a lot of interesting content about removing bottlenecks from network devices. I would appreciate recommendations for a newer book with similar content.