Download Advanced MPLS Design and Implementation by Vivek Alwayn PDF

By Vivek Alwayn

I have to admit that i used to be rather puzzled by means of this publication. MPLS isn't my most powerful sector of analysis - this ebook didn't support my development of data. this isn't a ebook to learn from cover-to-cover, yet most sensible learn because the specifications come up. i believe 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 could accompany MPLS implementations. additionally, i feel the booklet wanted a 2d grammatical editor, because the total 'flow' of the booklet was once nonevident. I supply this publication three pings out of five: !!..!

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Multicast Routing Module The multicast routing module builds the FEC table using a multicast routing protocol such as ProtocolIndependent Multicast (PIM). The multicast routing table is used to exchange label bindings with adjacent MPLS nodes for subnets contained in the multicast routing table. The label-binding exchange is performed using the PIM v2 protocol with MPLS extensions. Traffic Engineering Module The traffic-engineering module lets explicitly specified label-switched paths be set up through a network for traffic engineering purposes.

Link-state routing protocols such as OSPF and IS-IS are the protocols of choice, because they provide each MPLS node with a view of the entire network. 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.

A packet that enters the network at a particular router can be labeled differently than the same packet entering the network at a different router. As a result, forwarding decisions that depend on the ingress router can be made easily. This cannot be done with conventional forwarding, because the identity of a packet's ingress router does not travel with the packet. For example, packets arriving on different interfaces connected to CPE routers might be assigned to different FECs. The attached labels would represent the corresponding FECs.

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