Label Distribution in C#

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The last of these VPN types provides a specialized form of access to a customer network The IETF has specified the Layer 2 Tunneling Protocol (L2TP), which is explicitly designed to provide the authentication and multiplexing capabilities required for extending PPP sessions from a customer s L2TP Access Concentrator (LAC) to the service provider s L2TP Network Server (LNS) The topic of VPNs will be covered in Section 43
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42 Label Distribution
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In order for LSPs to be used, the forwarding tables at each LSR must be populated with the mappings from {incoming interface, label value} to {outgoing interface, label value} This process is called LSP setup or label distribution
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421 Introduction
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The MPLS architecture document (draft-ietf-mpls-arch) does not mandate a single protocol for the distribution of labels between LSRs In fact, it specifically allows for multiple protocols to be used in different scenarios Several different approaches to label distribution can be used depending on the requirements of the hardware that forms the MPLS network and the administrative policies used on the network The underlying principles are that an LSP is set up either in response to a request from the ingress LSR (downstream on demand) or preemptively by LSRs in the network, including the egress LSR (downstream unsolicited) It is possible for both to take place at once and for the LSP to meet in the middle In all cases, labels are allocated from the downstream direction (where downstream refers to the direction of data flow, which means advertised toward the data source) Thus, in the example in Figure 4-1, LSR D informs LSR B that LSR B should use label value 47 on all packets for host Z LSR B allocates a new label value (21), enters the mapping in its forwarding table, and informs LSR A that it should use label value 21 on all packets for host Z Some possible options for controlling how LSPs are set up and the protocols that can be used to achieve them are described in the following list:
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Hop-by-hop label assignment is the process by which the LSP setup requests are routed according to the next hop routing toward the destination of the data LSP setup could be initiated by updates to the routing table or in response to a new traffic flow The IETF MPLS
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Features of MPLS
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Working Group has specified (but not mandated) LDP as a protocol for hop-by-hop label assignment RSVP and CR-LDP can also be used
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In downstream unsolicited label distribution, the egress LSR distributes the label to be used to reach a particular host The trigger for this is usually new routing information received at the egress node Additionally, if the label distribution method is ordered control, each upstream LSR distributes a label further upstream This effectively builds a tree of LSPs rooted at each egress LSR LDP is currently the only protocol suitable for this mode of label distribution Once LSPs have been established across the network, they can be used to support new routes as they become available As the routing protocols (for example, BGP) distribute the new routing information upstream, they can also indicate which label (that is, which LSP) should be used to reach the destinations to which the route refers If an ingress LSR wants to set up an LSP that does not follow the nexthop routing path, it must use a label distribution protocol that enables the specification of an explicit route (ER) This requires downstreamon-demand label distribution CR-LDP and RSVP are two protocols that provide this function An ingress LSR may also want to set up an LSP that provides a particular level of service by, for example, reserving resources at each intermediate LSR along the path In this case, the route of the LSP may be constrained by the availability of resources and the nodes capability to fulfill the QoS requirements CR-LDP and RSVP are two protocols that enable downstream-on-demand label distribution to include requests for specific service guarantees
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