By Azhar Sayeed, Monique J. Morrow
The e-book seems to be a compilation of white paper drafts via varied humans - no transparent reasons for recommendations, positive factors mis-presented for advantages, no readability in arguments not to mention common sense at the back of, precise paragraphs showing in different locations even earlier than I acquired to web page eighty, visible grammatical blunders in every single place that usually i could not even start to bet what the authors have been attempting to say. This jogs my memory of 1 of these C- staff papers in collage prepare within the final minute w/o a lot efforts or suggestions. disillusioned and suprised the booklet was once written by means of Cisco humans and released by means of Cisco press.
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Additional info for MPLS and Next-Generation Networks: Foundations for NGN and Enterprise Virtualization
Sample text
IPSec and MPLS are not competing technologies and, in fact, can be deployed together. This aspect is further discussed in Chapter 8. Figure 1-4 depicts a basic example of an IPSec implementation. Note the IPSec tunnels (logical) running over the actual physical access technologies (which could be different depending on the local site). This is, of course, another benefit to using a logical Layer 3 MPLS VPN in that a logical Layer 3 MPLS VPN is access agnostic. Figure 1-4. IPSec VPN [View full size image] An overlay network is characteristic of the Layer 2 model, in which a customer's IP network is overlaid on top of a provider's network.
In contrast with a peer model for extranet, an organization using Layer 3 (that is, Laye 3 MPLS VPN), simply needs to configure the relevant Provider Edge (PE) for a Virtual Private Network (VPN). Migrating to Layer 3 services must not negatively impact application performance. For example, in determining bandwidth for streaming services, the amount of bulk data transfer/retrieval and synchronization information is approximately <384 Kb/s. A movie clip, surveillance, or real-time video requires between 20 and 384 Kb/s.
If this is the case, how are SLAs and security guaranteed when traffic traverses a third-party SP network, and/or a non-MPLS network? Additionally, which tools are used for billing, managing, and troubleshooting? Which mechanisms are available to an enterprise customer to validate billing? Order a new service? Check a report? How can an enterprise customer police its SLAs? Therefore, some key questions to ask the service provider include the following: • • • • • What is the technical know-how of the architecture and engin-eering support staff for the development and deployment of Layer 3 (BGP-VPN) services?