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Figure 1-11 Basic operation of MPLS Source: Altera (alteracom)
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1a Existing routing protocols (OSPF, IS-IS) establish the reachability of the destination networks 1b Label distribution protocol (LDP) establishes label-to-destination network mappings 2 Ingress edge LSR received a packet, performs layer-3 value-added services, and labels the packets
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3 LSR switches the packet using label swapping 4 Egress edge LSR removes the label and delivers the packet
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The diagram illustrates the flow of a packet through an MPLS-enabled network The source network is on the left and the destination network on the right The large cloud in the center is the wide area network (WAN)
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MPLS adds tags to IP packets at ingress routers, as shown in Figure 1-12 MPLS switches use the tags to make forwarding decisions This enables the MPLS switch/router to direct traffic along a path that the routing engine would not necessarily pick This is called constraint-based routing (CR) The tags are stripped at the egress switch/router MPLS started out initially as a traffic-engineering (TE) tool The idea to direct inter-POP traffic along a path with available capacity was the original performance enhancement goal of the standard Now MPLS is seen as a QoS mechanism and also offers other capabilities MPLS supports the reservation of bandwidth for traffic flows with different QoS requirements MPLS has the capability to bring reliability and predictability to IP-based networks, in particular with reference to supporting service level agreements (SLAs), CoS, grade of service (GoS), and QoS MPLS has the capability to converge multiple networks, technologies, and services into a single core network MPLS has the potential to bring operational savings by streamlining provisioning; also, it could make bandwidth management more efficient by supporting dynamic bandwidth allo-
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Table 1-1 RFCs on the IETF Standard Track as of September 30, 2001
RFC RFC 2702 Description
Requirements for Traffic Engineering over MPLS Identifies the functional capabilities required to implement policies that facilitate efficient and reliable network operations in an MPLS domain These capabilities can be used to optimize the utilization of network resources and enhance traffic-oriented performance characteristics MPLS Architecture Specifies the architecture of MPLS MPLS Label Stack Encoding Specifies the encoding to be used by an LSR in order to transmit labeled packets on Point-to-Point Protocol (PPP) data links, local area network (LAN) data links, and possibly other data links Also specifies rules and procedures for processing the various fields of the label stack encoding Use of Label Switching on Frame Relay Networks Specification Defines the model and generic mechanisms for MPLS on Frame Relay networks Extends and clarifies portions of the MPLS architecture and the Label Distribution Protocol (LDP) relative to Frame Relay networks MPLS using LDP and ATM Virtual Channel (VC) Switching Specifies in detail which procedures to use when distributing labels to or from ATM-LSRs, when those labels represent forwarding equivalence classes (FECs) for which the routes are determined on a hopby-hop basis by network layer routing algorithms Also specifies the MPLS encapsulation to be used when sending labeled packets to or from ATM-LSRs LDP Specification Defines a set of procedures called LDP by which LSRs distribute labels to support MPLS forwarding along normally routed paths LDP Applicability Describes the applicability of LDP by which LSRs distribute labels to support MPLS forwarding along normally routed paths Virtual Channel ID (VCID) Notification over ATM link for LDP Specifies the procedures for the communication of VCID values between neighboring ATM-LSRs The Assignment of the Information Field and Protocol Identifier in the Q2941 Generic Identifier and Q2957 User-to-User Signaling for the IP Specifies the assignment of the information field and protocol identifier in the Q2941 generic identifier and Q2957 user-to-user signaling for the IP Carrying Label Information in BGP-4 Specifies the way in which the label-mapping information for a particular route is piggybacked in the same Border Gateway Protocol (BGP) update message that is used to distribute the route itself When BGP is used to distribute a particular route, it can also be used to distribute an MPLS label that is mapped to that route
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