Ingress LSR LSR 1 LSR 2 LSR 3 in .NET

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Ingress LSR LSR 1 LSR 2 LSR 3
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Egress LSR
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Figure 8-25 LSP establishment with downstream-ondemand and ordered label distribution control
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Label Request Message ID 1 FEC Label Request Message ID 2 FEC Label Request Message ID 3 FEC Label Request Message ID 4 FEC
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Label Mapping Message ID 10 FEC Label Value 4 Request Message ID 1
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Label Mapping Message ID 9 FEC Label Value 3 Request Message ID 2
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Label Mapping Message ID 8 FEC Label Value 2 Request Message ID 3
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Label Mapping Message ID 7 FEC Label Value 1 Request Message ID 4
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Figure 8-26 The 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
Mess Type = Label Request (0401) Message ID FEC TLV Optional Parameters
Message Length
Hop-count TLV by 1 (except when the Hop-count TLV was previously set to 0, which means unknown) The Label Mapping message contains the same optional parameters as the Label Request message for the same reason loop detection In addition, the Label Mapping message can optionally carry a Label Request
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Quality of Service (QoS)
Quality of Service (QoS)
Message Length
Figure 8-27 The LDP Label Mapping message
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
Mess Type = Label Mapping (0400) Message ID FEC TLV Label TLV Optional Parameters
message ID TLV This parameter is simply the message ID of the Label Request message that prompted this Label Mapping message, which enables an upstream LSR to correlate a given Label Mapping message with the request that instigated the message The example signal flow of Figure 8-25 shows the use of the Label Request message ID TLV In addition to the Label Request and Label Mapping messages, we also have the Label Abort Request message, the Label Withdraw message, the Label Release message, the Address message, and the Address Withdraw message An LSR sends a Label Abort Request message when it wants to cancel a Label Request and has not yet received a Label Mapping message in response to the original request The Label Abort Request message includes the message ID of the original request so that the downstream LSR knows which request is being cancelled A downstream LSR sends a Label Withdraw message to an upstream LSR to indicate that the upstream LSR can no longer use a particular FEC/label binding An upstream LSR sends a Label Release message to a downstream LSR to indicate that it no longer requires the label/FEC mapping that was previously provided by the downstream LSR An upstream LSR must send a Label Release message in response to a Label Withdraw message An LSR uses an Address message to advertise its interface address(es) to LDP peers The LSR performs such advertisements prior to the exchange of any Label Request or Label Mapping messages Moreover, the LSR sends an Address message whenever a new interface is added to the LSR An LSR uses the Address Withdraw message to withdraw previously advertised interface addresses An LSR would send also the message if, for example, an interface is taken out of service Both the Address and Address Withdraw messages contain an Address List TLV This TLV comprises an address family field indicating the type of addresses in the list (IPv4 or IPv6), followed
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Quality of Service (QoS)
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by a list of addresses corresponding to the interfaces being advertised or withdrawn Notification messages are used to provide advisory information and signal error information The Notification message includes a Status TLV, which can carry status or error information If, for example, a loop were detected during LSP establishment, then a Notification message would be returned with Status Code 0000000B (loop detected) A Notification message can optionally contain an LDP PDU (or part of one) or an LDP message (or part of one) if a particular PDU or message generated the error For example, if a given LDP message caused an error at the receiving LSR, then that LSR would return a Notification message with an appropriate status code plus as much of the received message as necessary to indicate the problem in the message Constraint-Based LDP (CR-LDP) The foregoing description of LDP shows how an LSP can be established end to end The LSP is effectively a network path that is associated with a given FEC As we have also described, the significance of a given FEC is established at the network edge, where information such as the bandwidth requirements, IP ToS setting, the ingress router, and the incoming interface can be known Unfortunately, LDP does not enable that additional information to be passed in LDP messages as part of LSP establishment LDP only passes the destination address or address prefix, which does not enable downstream LSRs to make LSP routing decisions that can take other information into account For example, an LER might want to establish an LSP that has certain bandwidth requirements We need a mechanism whereby such requirements can be conveyed during label advertisement and mapping so that the LSP establishment can include the allocation of the appropriate resources CR-LDP is one way to do this CR-LDP is specified in RFC 3212 and is an extension of LDP, whereby an LSP can be established subject to certain constraints, such as traffic parameters, resource requirements, and other characteristics In fact, CR-LDP can enable the establishment of LSPs according to explicit routing requirements such that the LSP establishment messages can specifically indicate which LSRs should be included in the LSP
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