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Modified LDP Messages for CR-LDP Using the new information defined in
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CR-LDP, the Label Request and Label Mapping messages are modified as shown in Figures 8-30 and 8-31 The LSPID is a unique identifier for the CR-LSP in an MPLS network The LSPID is composed of the ingress LSR router ID (or any of its own IPv4 addresses) and a locally unique CR-LSPID to that LSR The LSPID also includes an action indicator flag, which indicates the action that should be taken if the LSP already exists on the LSR in question For example, we might want to modify the traffic parameters associated with a given LSR (such as add more bandwidth), in which case the action indicator flag would indicate that the LSP is to be modified If set to 0, the action indicator flag indicates that this is an initial LSP establishment The ability to indicate
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Figure 8-30 CR-LDP Label Request message
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0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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Mess Type = Label Request (0401) Message ID FEC TLV LSPID TLV ER-TLV Traffic TLV Pinning TLV Resource Class TLV Preemption TLV
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Message Length
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(CR-LDP, mandatory) (CR-LDP, optional) (CR-LDP, optional) (CR-LDP, optional) (CR-LDP, optional) (CR-LDP, optional)
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Figure 8-31 CR-LDP Label Mapping message
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0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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Mess Type = Label Mapping (0400) Message ID FEC TLV Label TLV
Message Length
Label Request Message ID LSPID TLV Traffic TLV (CR-LDP, optional) (CR-LDP, optional)
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Quality of Service (QoS)
Quality of Service (QoS)
the required action means that the parameters associated with an LSP can be changed without having to release and reestablish the LSP The ER TLV specifies the path to be taken through the network The TLV is composed of a number of ER-hop TLVs Each ER-hop TLV indicates the type of hop (T), the length of the hop address (L), and the value of the address associated with the hop (V) Four types of ER hops are defined: an IPv4 address, an IPv6 address, an autonomous system number, and an LSPID For each ER-hop TLV, a single bit specifies whether this is a loose hop or a strict hop If this is a strict hop, then the address in the ER-hop TLV must match the LSR that has received this Label Request message Otherwise, we have an error situation If this is a loose hop, then the LSR receiving the message must pass the request on towards the LSP indicated in the address part of the ER-hop TLV The ability to indicate an existing LSPID as a hop to be traversed is quite useful and enables us to easily establish MPLS tunnels within tunnels Recall our earlier example of a transatlantic VoIP operator that purchased international IP transport from an international IP service provider Let s assume that the international IP provider establishes an MPLS tunnel for the VoIP operator to use That tunnel could have a specific LSPID If the VoIP operator wants to establish multiple LSPs through that tunnel (one LSP for bearer traffic, one for signaling traffic, one for admin traffic, and so on), the establishment of each of the LSPs could specify the LSPID of the overall tunnel as one of the ER-hop TLVs This action would effectively establish each new LSP as a tunnel within the overall tunnel allocated to the VoIP operator The Pinning TLV is used with loose ERs It includes a means of indicating whether or not a path may be changed at a given LSR if a better next hop becomes available later Of course, such changes cannot apply to a strict ER
Enabling Traffic Engineering and QoS with CR-LDP The foregoing description of CR-LDP indicates how we can apply traffic requirements and explicit routing requirements to the establishment of an LSP By ensuring that an LSP is established according to certain criteria, we can ensure that the traffic carried on that LSP always gets the resources it needs For example, we can set up an LSP that meets certain resource requirements (such as bandwidth) and reserve those resources so that they are dedicated to that FEC s traffic Moreover, we can specifically indicate the route that a given LSP needs to take through the network Imagine a traffic-engineering tool used to engineer an MPLS network The tool has a graphical user interface (GUI) that shows the topology of the
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Quality of Service (QoS)
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