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Extra info for Configuring Cisco voice over IP. Online access for BTH

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So even without using all of the addresses that IPv6 has available, we have the scaling ability to take us well beyond the future of IPv4. Clearly, IPv6 frees up our ability to use addressing efficiently without having to worry about running out of addresses. Please keep in mind that I do not mean to say that address space should be used in a carefree manner; that is how IPv4 came into its current predicament. 1 presents a rough comparison of the address sizes of IPv4 and IPv6. 25 E+037 Increased Addressing Hierarchy Support As we learned earlier in the chapter, IPv6 addressing has restructured the means by which address blocks are delegated.

Furthermore, we want to allow our customers to receive a full routing table, should they desire one, if they want to use explicit routes to form their routing policy. Though an Internet core is usually composed of very modern, robust routing equipment, a Tier 2 provider may not be able to afford to constantly upgrade their backbone in order to keep up with new technology and increased routing table size. Luckily, with IPv6, processing power is not as big a worry as it could be. We can provide full routes to a customer, and that set of routes may not be too big for us to handle.

For example, you could not reduce disable to DI, because disconnect also starts with DI, so you would need to use DISA, and conversely, disconnect would need to be DISC. This indicates that you need to provide more information to the router. This feature automatically completes the entering of a command for you when you simply press the Tab key. The following code example demonstrates this feature. You follow this by t and hit the Tab key to get the terminal word to appear: 6Router-1#con 6Router-1#conf 6Router-1#configure t 6Router-1#configure terminal A set of shortcuts is also available with specific keystrokes.

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