Rabu, 25 Januari 2012

RSVP-TE: Resource Reservation Protocol - Traffic Extension


RSVP-TE: Resource Reservation Protocol  - Traffic Extension
The RSVP-TE protocol is an addition to the RSVP protocol for establishing label switched paths (LSPs) in MPLSnetworks. The extended RSVP protocol (RSVP-TE) supports the instantiation of explicitly routed LSPs, with or without resource reservations. RSVP-TE also supports smooth rerouting of LSPs, preemption, and loop detection.
RSVP-TE defines a session as a data flow with a particular destination and transport-layer protocol. When RSVP and MPLS are combined, a flow or session can be defined with greater flexibility and generality. The ingress node of an LSP (Label Switched Path) uses a number of methods to determine which packets are assigned a particular label. Once a label is assigned to a set of packets, the label effectively defines the flow through the LSP. Such an LSP is an LSP tunnel because the traffic through it is opaque to intermediate nodes along the label switched path. New RSVP Session, Sender and Filter Spec objects, called LSP Tunnel IPv4 and LSP Tunnel IPv6 have been defined to support the LSP tunnel feature.


In some applications it is useful to associate sets of LSP tunnels, such as during reroute operations or in spreading a traffic trunk over multiple paths, which sets are called traffic engineered tunnels (TE tunnels). To enable the identification and association of the LSP tunnels, two identifiers are carried. A tunnel ID is part of the Session object. The Session object uniquely defines a traffic engineered tunnel. The Sender and Filter Spec objects carry an LSP ID. The Sender (or Filter Spec) object, together with the Session object, uniquely identify an LSP tunnel.


Protocol Structure - RSVP-TE Resource Reservation Protocol  - Traffic Extension Apart from the existing message types listed in RSVPan additional message type is available:

Value
Message type
14
Hello


In addition, the following additional Protocol Object Types exist: 

Value
Object type
16
Label
19
Optical
20
Explicit Route
21
Record Route
22
Hello
207
Attribute Session


Irfan Irawan
Irfan Irawan

I have graduated from NIIT-Telkom Center then continuing with Degree of Telkom Polytechnic Bandung, while working i've graduated from ISTN Jakarta. I Like of writing, researching something new and also documenting knowledge i've learned during work on multinational company. Absolutely, all of this must be shared to another ~the life means to reach the high end~ This is the meaning of my Moslem name "Irfan"

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