Figure 3-10 SE reservation style in Visual C#.NET

Reader PDF 417 in Visual C#.NET Figure 3-10 SE reservation style

Figure 3-10 SE reservation style
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HS1 HS2
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R1 / R2
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IngressLSR
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C LSP: FEC (HR, HS1 & HS2)
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intserv Area
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A ResvTear removes the senders listed by the Filterspec objects from the list of the senders associated to the FEC In both cases, if no more senders are available for that session, the associated CR-LSP is released via a Label Release message
Wildcard-Filter (WF) Style The wildcard-filter (WF) reservation style uses the shared and the wildcard reservation options; that is, all of the traffic directed toward the receiver of the session receives the same treatment in the MPLS domain No per-sender classification is performed Figure 3-11 depicts the WR reservation style A single FEC (a single CR-LSP) is then defined and used by all the packets that match the three parameters of IP destination address, protocol, and transport destination port contained in the Session object A Resv message using the WF style does not contain a Filterspec object When an ingress LSR receives a PathTear message, it releases the CRLSP only if no more senders are available for that session The arrival of a ResvTear message always releases the CR-LSP Shared Option/Multiple Ingress LSRs A modification of the mechanisms
described earlier is needed when hosts send Path messages to the MPLS domain through different ingress LSRs while sharing some LSRs of the path Figure 3-12 shows the multiple ingress LSR topology In Figure 3-9 each of the three hosts HS1, HS2, and HS3 sends (at different times) a Path message to the same session toward HR The Path originated by HS1 enters the MPLS domain through ingress LSR1 while the Paths originated by HS2 and HS3 enter through ingress LSR2 The host HR sends a single Resv message to the egress LSR, which is the common PHop of the three senders The egress LSR sends two Resv messages to the two PHops of the session: one being ingress LSR1 for HS1 and the other being the ingress LSR2 for both HS2 and HS3 Both ingress LSR1 and ingress LSR2 forward these messages upstream inside the intserv area
Figure 3-11 WF reservation style
HS1 HS2
R1 / R2
AM FL Y
IngressLSR LSR
EgressLSR
C LSP: FEC = (HR)
intserv Area
MPLS domain
intserv Area
Figure 3-12 Multiple ingress LSRs topology
Resv HS1 IngressLSR1
3
(Resv) EgressLSR
Resv HR
Resv HS2 / HS3 Resv IngressLSR2
(Resv)
intserv Area
MPLS domain
intserv Area
The problem posed by this topology is that, following the rules given in the previous paragraphs, ingress LSR1 and ingress LSR2 will create two different CR-LSPs for the same session inside the MPLS domain: one for HS1 and the other for HS2 and HS3, each reserving the resources requested with the Resv message This situation leads to a waste of resources when the shared reservation option (either the SE or the WF style) is used All the shared links have a reservation of resources that is twice the needed amount To overcome this issue, a new CR-LDP Shared TLV object is added to Label Request messages, which signals to all of the LSRs along the path to share reservation requests The ingress LSR1 of Figure 3-7 puts the three fields of the RSVP Session object that identifies the receiver in the Session field of this TLV The LSR inside the domain adds the value of this field to the local state and forwards the Label Request message toward the egress LSR Also the ingress LSR2 sends its Label Request message to LSR with a Shared TLV LSR finds an identical Shared TLV (the one from ingress LSR1) in its state Thus, LSR does not forward the message and directly sends a Label Mapping message to ingress LSR2 From LSR onward, there is a single CR-LSP used by HS1, HS2, and HS3, which share the common resources LSR will assign the same outgoing label to both the incoming labels identifying the traffic from ingress LSR1 and ingress LSR2 All the ingress LSRs should put this object in the Label Request messages triggered by Resv messages using either WF or SE styles The Shared TLV must not be used together with the FF style because each flow needs different reservations The use of this object is optional because the only side effect is a waste of resources RSVP or CR-LDP message processing is not affected
Quality of Service (QoS)
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