By Vivek Alwayn

ISBN-10: 158705020X

ISBN-13: 9781587050206

I have to admit that i used to be particularly puzzled via this e-book. MPLS isn't my most powerful quarter of analysis - this ebook didn't aid my development of information. this isn't a ebook to learn from cover-to-cover, yet most sensible learn because the requisites come up. i feel the writer used to be quite biased in the direction of 'pro-Cisco'. i didn't see any point out of the functionality degradations which may accompany MPLS implementations. additionally, i feel the e-book wanted a second grammatical editor, because the total 'flow' of the e-book was once nonevident. I supply this publication three pings out of five: !!..!

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Sample text

In the case of ATM, the label is placed in either the VCI or VPI field of the ATM header. However, if the frame is a Frame Relay frame, the label occupies the DLCI field of the Frame Relay header. Layer 2 technologies such as Ethernet, Token Ring, FDDI, and point-to-point links cannot utilize their Layer 2 address fields to carry labels. These technologies carry labels in shim headers. The shim label header is inserted between the link layer and the network layer, as shown in Figure 3-2. The use of the shim label header allows MPLS support over most Layer 2 technologies.

In conventional routers, the IP routing table is used to build the Fast Switching cache or the Forwarding Information Base (FIB) used by Cisco Express Forwarding (CEF). However, in MPLS, the IP routing table provides information on destination network and subnet prefixes used for label binding. Label-binding information can be distributed using the Label Distribution Protocol (LDP) or Cisco's proprietary Tag Distribution Protocol (TDP) or by piggybacking the label-binding information on top of modified routing protocols.

Quality of Service (QoS) Module The QoS module builds the FEC table using conventional Interior Gateway Protocols (IGPs) such as OSPF, or ISIS, etc. The IP routing table is used to exchange label bindings with adjacent MPLS nodes for subnets contained within the IP routing table. The label-binding exchange is performed using extensions to LDP or Cisco's proprietary TDP. com/158705020X/ch03lev1sec2] Copyright © 2002 O'Reilly & Associates, Inc. All rights reserved. 1005 Gravenstein Highway North Sebastopol, CA 95472 Book: Advanced MPLS Design and Implementation Section: MPLS Architecture MPLS Elements A detailed understanding of the various MPLS elements will help you understand the interaction between MPLS and the various Layer 2 and 3 protocols and devices.

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Advanced MPLS Design and Implementation by Vivek Alwayn


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