Chapter 8
Edge-Routed Bridging
The previous chapter introduced integrated routing and bridging (IRB) as a means of doing both bridging and routing on the same device. Centrally routed bridging, a type of IRB design, models the fabric so that all routing occurs at a central point (usually the spines of a Clos fabric). However, with such a design, traffic tromboning can occur, making it a highly inefficient and impractical design when hosts that are connected to the same leaf, but in different subnets, want to communicate with each other (which is very common in today’s large-scale, multitenant data centers).
With advancements in both merchant and custom silicon, cost-effective, feature-rich 1RU devices that can do RIOT (Routing In and Out of ...
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