how to read data from barcode scanner in c# HS R1 IngressLSR LSR EgressLSR in Visual C#.NET

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HS R1 IngressLSR LSR EgressLSR
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(Resv) LabelReq LabelMap
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(Resv) LabelReq LabelMap
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intserv Area
If no errors are found while forwarding the Label Request message, the egress LSR forwards a label-mapping message that creates the CR-LSP to the ingress LSR During the usage of the CR-LSP, if a new Resv message updates some of the traffic parameters in the Flowspec object, the ingress assigns flow enough resources to fit this request The old CR-LSP should be released via a Label Release message, and a new one with the changed traffic parameters TLV must be set up If the NHop address in a Resv message changes, that is, if a new egress LSR is selected, the CR-LSP must be adapted to reach the new exit point The old path should be released, and the new one should be set up Path and Resv Refresh Messages RSVP Resv and Path messages are periodically resent to maintain soft state, that is, to confirm existing state CR-LDP uses its own mechanisms to keep CR-LSPs alive Thus, at the arrival of a Refresh message, the ingress LSR does not send any CR-LDP message into the MPLS domain Teardown Messages RSVP uses PathTear and ResvTear to remove RSVP state Some of these messages (such as PathTears to nodes that did not receive any Resv) do not release any sort of resource, whereas others do The latter case may only cause the transmission of a CR-LDP Label Release message Error Messages PathErr and ResvErr RSVP messages between the ingress LSR and the egress LSR travel as regular IP traffic inside the MPLS domain Error messages do not remove any RSVP state They trigger Teardown messages that are responsible for the removal of state on upstream/downstream RSVP nodes That is, MPLS is not interested in error messages that modify internal RSVP state From an RSVP standpoint, CR-LDP error messages generated inside the MPLS domain do not
Quality of Service (QoS)
map into any RSVP error message RSVP nodes treat LSRs as non-RSVProuters that are not expected to provide QoS; whether additional QoS is provided inside the MPLS domain or not, it is a matter local to the domain itself Classification Soon after the CR-LSP has been established by the LSRs, the ingress LSR is ready to transmit the packets belonging to the original intserv flow into the MPLS domain It is necessary to accurately specify which packets may be mapped to the CR-LSP Providing an FEC specification for the CR-LSP accomplishes this goal Using the MPLS terminology, an FEC is a group of packets forwarded over the same path and with the same forwarding treatment The way an FEC is determined depends on the reservation style used by the Resv message The reservation styles include
I I I I
Fixed-filter (FF) style Shared-explicit (SE) style Wildcard-filter (WF) style Shared option/multiple ingress LSRs
Fixed-Filter (FF) Style The fixed-filter (FF) reservation style uses the distinct reservation option; that is, senders use different resources from each other To keep this separation among senders flows even in the MPLS domain, distinct CR-LSPs may be defined, each mapping one RSVP sender s traffic to a different FEC Figure 3-9 depicts the FF reservation style All the packets belonging to the same RSVP flow have five common parameters in the IP/transport headers: the IP destination address, IP source address, protocol, TCP/UDP destination port, and TCP/UDP source port Hence, the ingress LSR checks these parameters to determine the FEC and choose the related CR-LSP
Figure 3-9 FF reservation style
HS1 HS1
R1 / R2
IngressLSR
EgressLSR
C LSP1: FEC (HR,HS1) C LSP2: FEC (HR,HS2)
intserv Area
MPLS domain
intserv Area
3
When a Resv message arrives, the ingress LSR reads these five parameters from the Session and Filterspec objects It then associates each arriving packet to the FEC that matches these parameters As a consequence, a different FEC is created for each different sender If a Resv message that adds a Filterspec to the existing list arrives to the ingress LSR, a new Label Request message is sent to set up the related CRLSP If an existing Filterspec is deleted, the related LSP must be deleted using a Label Release message A Teardown message always deletes the CR-LSP associated with the sender torn down If a PathTear arrives, only the sender specified by the Sender Template object is removed Thus, the (possibly) allocated CR-LSP is released If a ResvTear arrives, all CR-LSPs that match the Filterspec objects specified in the message are released
Shared-Explicit (SE) Style The shared-explicit (SE) reservation style uses the shared reservation option; that is, all the senders of the session share the resources over the common hops of the path This style uses also the explicit option; that is, the Resv message carries in Filterspec objects with the identity of each sender that uses the resources Figure 3-10 depicts the SE reservation style As in the FF style, each packet is classified by matching the five parameters in its headers with the information contained in the Session and Filterspec objects What changes is the use of a single FEC for all the senders The ingress LSR uses a single FEC (that is, a single CR-LSP) for the traffic generated by all the senders of the session identified by a Filterspec object This way all of the sender s flows are merged inside the MPLS domain, which applies the same treatment to these packets If a Resv message that modifies the Filterspec list arrives to the ingress LSR, this node updates the FEC associated to that RSVP session No modifications of the CR-LSP are then needed If the ingress LSR receives a PathTear message, it modifies the FEC (if one has been defined because of the arrival of a Resv message), removing the sender specified by the Sender Template object from the list of senders
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