Read e-book online CCIE Professional.Development Inside Cisco IOS Software PDF

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By Vijay Bollapragada

ISBN-10: 1587058162

ISBN-13: 9781587058165

Within Cisco IOS software program structure deals an important and hard-to-find info on Cisco's Internetwork working procedure (IOS) software program. IOS software program offers the skill wherein networking execs configure and deal with Cisco networking units. past realizing the Cisco IOS command set, comprehending what occurs within Cisco routers may help you as a community fashion designer or engineer to accomplish your activity extra successfully. by way of realizing the inner operations of IOS software program, it is possible for you to to take architectural issues into consideration whilst designing networks and isolate difficulties extra simply whilst troubleshooting networks. inside of Cisco IOS software program structure offers crucial info at the inner elements of IOS software program at this point, and it really is a useful source for higher realizing the intricacies of IOS software program and the way it impacts your community.

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

Example text

If it's not possible to expand the pool within the context of the request, it fails the request and expands the pool later in the pool manager background process. Packet buffer pools are classified as either public or private. Public pools, as the name implies, are available for use by any system process, and private pools are created for (and known only to) a specific subset of processes that use them. System Buffers Every IOS system has a predefined set of public buffer pools known as the system buffers.

The sizes vary from 104 bytes up to 18,024 bytes in order to accommodate the various maximum transmission unit (MTU) sizes encountered on different interface media. The remainder of the fields in Example 1-10 are as follows: • total— The total number of buffers in the pool (both allocated and free). • permanent— The base number of buffers in the pool. For dynamic pools, the total number of buffers can fluctuate as the pool grows and shrinks. However, there will never be less than the permanent number of buffers in the pool.

Other factors, such as I/O bus performance and data memory speed, can have a big impact on switching performance. The challenge for IOS developers is to create the highest possible switching performance given the limits of available CPU, I/O bus, and memory technology. As the size and number of routed networks grow, IOS developers continuously look for better ways to solve this performance challenge, resulting in a continuous redesign and refinement of IOS switching methods. When IOS was first developed, there was only one switching method, known today as process switching.

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CCIE Professional.Development Inside Cisco IOS Software Architecture by Vijay Bollapragada

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