New PDF release: CCIE Professional.Development Inside Cisco IOS Software

By Vijay Bollapragada

Within Cisco IOS software program structure deals an important and hard-to-find details on Cisco's Internetwork working method (IOS) software program. IOS software program offers the skill through which networking execs configure and deal with Cisco networking units. past realizing the Cisco IOS command set, comprehending what occurs inside of Cisco routers can help you as a community fashion designer or engineer to accomplish your task extra successfully. by means of knowing the inner operations of IOS software program, it is possible for you to to take architectural concerns under consideration whilst designing networks and isolate difficulties extra simply whilst troubleshooting networks. inside of Cisco IOS software program structure presents crucial info at the inner features of IOS software program at this point, and it's a useful source for higher figuring out the intricacies of IOS software program and the way it impacts your community.

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Additional info for CCIE Professional.Development Inside Cisco IOS Software Architecture

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The case where more than one IP address points to the same hash location is called a collision. When collisions occur, IOS links each of the colliding cache entries together in a list within the bucket up to a maximum of six entries. This way, no more than six entries in the cache need to be searched to find a particular match. 2, the hash table was replaced with another data structure called a 2-way radix tree (a form of a binary tree). The MAC headers are still stored as part of the cache in this implementation.

Router B will also cache destinations on the client network in the same manner Router A did. In this case, Router B will build two cache entries along one path, and the third along the other path. It could turn out Router B will choose to send the traffic for two clients along the path not chosen by Router A. This would result in a fairly well distributed traffic load on the parallel paths. It's just as likely Router B will choose to cache two client entries along the same path Router A chose for the server traffic, however, resulting in unbalanced utilization of the paths.

Hardware Architecture for Shared Memory Routers Let's examine the hardware architecture on these shared memory platforms in some detail. We start with an overview of the generic shared memory architecture in Figure 3-1, and then mention some of the unique hardware features of platforms within this group. Figure 3-1. Shared Memory Router Architecture 58 You can see the overall architecture is fairly basic, consisting of just three major components: the processor (CPU), memory (DRAM), and interface controllers, with the processor and the interface controllers connected to the memory via data busses.

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