EIGRP – Auto Summary

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I’ve been revising some EIGRP and it seems that a lot of what I used to know, I don’t know. Or maybe I didn’t know it the first time. Here, I’m just fiddling with EIGRP and the auto-summary command.

Routing Protocols and Computation in Silicon

I got this question and I guess it may not be obvious to everyone so I’ll have a shot at answering it.

Technology advances in ASIC hardware have resulted in substantial improvements in switching performances of routers and switches. However, the routing processes are still dependent on CPU speeds. What are the existing limitations in router/switch models which prevent route computations from being performed in hardware?

Loop-Free Alternate Routes

Whilst at Cisco Live recently I was intrigued to learn about an apparently simple yet effective fast routing convergence technique called Loop-Free Alternate Fast ReRoute (LFA-FRR), a.k.a. IP Fast ReRoute (IP-FRR).

Many service providers and enterprises these days tune their interior gateway protocol (IGP) timers, aiming to achieve sub-200ms convergence. This can be quite an intensive and design impacting challenge.