By Ivan Pepelnjak
ISBN-10: 1587050811
ISBN-13: 9781587050817
Prepare for CCIP certification as you learn how to layout and set up MPLS-based VPNs
- Assists in education for the CCIP MPLS non-obligatory examination with unique expertise insurance and overview questions
- Offers in-depth research of MPLS architecture
- Helps you learn the way MPLS scales to help tens of hundreds of thousands of digital inner most networks (VPNs)
- Provides wide case reports that consultant you thru the layout and deployment of real-world MPLS/VPN networks
- Presents configuration examples and directions that help you in configuring MPLS on Cisco devices
- Provides layout and implementation recommendations that assist you construct a number of VPN topologies
Multiprotocol Label Switching (MPLS) is an leading edge method for high-performance packet forwarding. the main extensively deployed utilization of MPLS at the present time is the permitting of VPNs. With the creation of MPLS-enabled VPNs, community designers can larger scale their networks than ever before.
MPLS and VPN Architectures, CCIP Edition, is a realistic consultant to knowing, designing, and deploying MPLS-based VPNs. This publication covers MPLS conception and configuration, community layout concerns, and one significant MPLS software: MPLS-based VPNs. The MPLS/VPN structure and all its mechanisms are defined with configuration examples, recommended layout and deployment directions, and broad case studies.
This ebook has been revised from the 1st version to incorporate insurance of the CCIP MPLS optional examination. New chapters disguise MPLS troubleshooting and MPLS/VPN troubleshooting; self-assessment questions on the finish of every bankruptcy assist you arrange for the CCIP MPLS optionally available examination. CCIP applicants opting for to stick to the MPLS optional will locate this ebook to be a worthy self-study part of their examination preparation.
MPLS and VPN Architectures, CCIP Edition, is a part of a urged studying course from Cisco platforms which could contain simulation and hands-on education from licensed Cisco studying companions and self-study items from Cisco Press. to determine extra approximately instructor-led education, e-learning, and hands-on guideline provided by way of approved Cisco studying companions around the globe, please stopover at www.cisco.com/go/authorizedtraining.
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Extra info for MPLS and VPN Architectures
Sample text
4, tags imposed: {28} The interaction between MPLS, IGP, and BGP gives a network designer a completely new approach to network design. Traditionally, BGP had to be run on every router in the core of a service provider network to enable proper packet forwarding. For example, BGP information from MAE-East had to be propagated to every core router in the SuperNet network (Washington, Dallas, and San Francisco). If that were not the case, the core routers could not route the packets toward the BGP destination, as illustrated in Figure 2-10.
Then the New York router does a simple Layer 3 lookup and forwards the packet to its final destination (Step 5 in Figure 2-9). 48 Figure 2-9. Penultimate Hop Popping in the SuperNet Network PHP is requested through TDP or LDP by using a special label value (1 for TDP, 3 for LDP) that also is called the implicit-null value. When the egress LSR requests PHP for an IP prefix, the local LIB entry in the egress LSR and the remote LIB entry in the upstream LSRs indicate the imp-null value (see Example 2-19) and the LFIB entry in the penultimate LSR indicates a tag pop operation (see Example 2-20).
If the next-hop router didn't assign a label to the corresponding prefix, the outgoing action in LFIB is unlabeled. Example 2-13 shows both cases. NOTE A router that has no label for a specific IP prefix from the next-hop router marks the prefix as unlabeled if it is not a directly connected interface or is not a summary route. If the route is connected directly or is a summary route, an additional Layer 3 lookup is needed and a router assigns a null label to that prefix due to a mechanism called Penultimate Hop Popping, which is covered in the next section.
MPLS and VPN Architectures by Ivan Pepelnjak
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