WO2002017542A2 - Systeme et procede pour l'affectation d'etiquettes mpls sur des connexions de transport sonet/hns a concatenation virtuelle - Google Patents

Systeme et procede pour l'affectation d'etiquettes mpls sur des connexions de transport sonet/hns a concatenation virtuelle Download PDF

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Publication number
WO2002017542A2
WO2002017542A2 PCT/US2001/026533 US0126533W WO0217542A2 WO 2002017542 A2 WO2002017542 A2 WO 2002017542A2 US 0126533 W US0126533 W US 0126533W WO 0217542 A2 WO0217542 A2 WO 0217542A2
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WIPO (PCT)
Prior art keywords
packet
nxvt
connections
mpls
connection
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PCT/US2001/026533
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English (en)
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WO2002017542A3 (fr
Inventor
James Scott
Lee Gordon
Chen Wen-Lung
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Geyser Networks, Inc.
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Priority to AU2001288396A priority Critical patent/AU2001288396A1/en
Publication of WO2002017542A2 publication Critical patent/WO2002017542A2/fr
Publication of WO2002017542A3 publication Critical patent/WO2002017542A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/60—Software-defined switches
    • H04L49/606—Hybrid ATM switches, e.g. ATM&STM, ATM&Frame Relay or ATM&IP
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0003—Switching fabrics, e.g. transport network, control network
    • H04J2203/0005—Switching elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0003—Switching fabrics, e.g. transport network, control network
    • H04J2203/0005—Switching elements
    • H04J2203/0008—Time switch details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0028—Local loop
    • H04J2203/0039—Topology
    • H04J2203/0041—Star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0073—Services, e.g. multimedia, GOS, QOS
    • H04J2203/0075—Connection-oriented
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0073—Services, e.g. multimedia, GOS, QOS
    • H04J2203/0082—Interaction of SDH with non-ATM protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H04L2012/6424—Access arrangements

Definitions

  • the present invention relates to optical networking. More particularly, the invention relates to a system and method of binding MPLS labels to virtually concatenated SONET/SDH transport connections.
  • Such networks typically suffer a discontinuity between the higher layer connectionless IP control plane running an IP routing protocol (whether it be an interior gateway protocol, such as OSPF, or an exterior gateway protocol, such as BGP), and the lower layer connection-oriented ATM control plane running its own routing protocol (PNNI).
  • IP routing protocol whether it be an interior gateway protocol, such as OSPF, or an exterior gateway protocol, such as BGP
  • PNNI lower layer connection-oriented ATM control plane running its own routing protocol
  • Numerous approaches have been submitted to standards bodies to address this issue, each with its various merits and demerits.
  • the underlying transport layer connections using such technologies as SONET, SDH, or DWDM, have typically been provisioned using a directed approach, where each cross-connect in the transport path is individually established using a vendor-specific element management system (EMS).
  • EMS vendor-specific element management system
  • end-to-end provisioning of circuits has traditionally been a laborious and time-consuming procedure for service providers.
  • prior art system 100 includes routers 120, 122, and 124, servers 130, 132, 134, and 136, an add/drop multiplexer (MUX) 112, logically interconnected as shown, in a ring 110.
  • Servers 130 and 132 are logically connected via LSP 140, while servers 134 and 136 are logically connected via LSP 142.
  • Router 120 is a MPLS router. There is a physical link 150.
  • nodes in the access network receiving L3 packets from attached routers would process the IP header or MPLS label and select an outgoing label, used to direct the packet toward the appropriate line card at the destination node. This label is then pushed onto the label stack. Next, the label used to forward the packet to the destination node itself is selected and pushed onto the stack.
  • the switch card which is an MPLS LSR
  • Label Switched Router will pop the top label off of the stack and examine the underlying label to determine which line card the packet is to be switched to. In this way, an interoperable method of forwarding traffic in the access network is achieved.
  • the cost is the overhead of having the switch card pop the top label off of the label stack.
  • the functionality necessary for this capability is essentially identical to that required for supporting access network topologies defined by sparsely connected .
  • any connections afforded service guarantees were point-to-point (Transparent Lan Service received Best Effort service). As such, the admission control decisions were fairly simple. However, in the cases described in this document, anypoint-to-anypoint connectivity with service guarantees must now be supported.
  • any port in the system can be significantly oversubscribed, due to multiple ports directing traffic to it.
  • a method of admission control is required to ensure that the level of oversubscription does not reach a point at which the associated service guarantees may be compromised.
  • the lowest level determines whether the connection can be admitted, based on the existing port configuration and resources reserved for the currently established connections on those ports.
  • This level of admission control can be implemented in the CR- LDP/RSNP Traffic Engineering module, local to each network element (residing on the present invention's switch card). Additionally, this level of admission control should embrace a more sophisticated algorithm than simply accounting for the summation of OR or PIR.
  • the higher level of admission control is needed to determine whether admitting (or deleting) the connection will cause the bandwidth associated with the quasi-static node-interconnect LSPs to change. If so, the bandwidth of the relevant LSP is modified according to the two standards-based methods described above.
  • This level of admission control is most easily placed in an element that has a global view of the topology (such as the centralized EMS, in the current software architecture).
  • the present invention provides a system and method of binding MPLS labels to virtually concatenated SONET/SDH transport connections.
  • a system and method of binding MPLS labels to nxVT connections is provided and includes (1) classifying packets, and (2) mapping packets with a same forward equivalence class to a same nxNT connection.
  • the mapping includes (a) associating a certain bandwidth of a connection between an external router and an add-drop multiplexer, between a source node and a destination node, and (b) creating a nxNT conection between the source node and the destination node, thereby creating a label switch path between the source node and the destination node.
  • a system and method of binding MPLS labels to nxNT connections is also provided and includes mapping packets with the same MPLS label to the same nxNT connection.
  • Figure 1 illustrates a prior art MPLS labeling system.
  • Figure 2 illustrates MPLS labeling in accordance with an exemplary embodiment of the present invention.
  • the invention described in co-pending and commonly assigned U.S. Patent Application No. (Number to be assigned) with Attorney Docket Number 55369-014 provides a system and method of virtually concatenating VTl .5s and STS-ls over SONET and SDH and WDM.
  • the virtual concatenation invention allows users to setup connections or pipes with configurable bandwidth over either nxSTS-l/nxAU-3/nxAU-4 or nxVTl .5/nxTU-l l/nxTU-12 within a nxSTS-l/nxAU-3/nxAU-4 pipe on an existing SONET/SDH network.
  • This provides a connection or pipe of adjustable bandwidth with a granularity of close to 1.5 Mbps to fit the needs of applications.
  • the resulting connection can be treated as a TDM like connection.
  • the virtual concatenation invention applies to nxAU-3/nxAU-4 and nxTU-1 l/nxTU-12 for SDH networks. For simplicity, these connections are called “nxNT” for both SONET and SDH networks.
  • the virtual concatenation invention applies to nxSTS-1 and nxAU-3/nxAU-4.
  • a dynamic bandwidth allocation (DBA) protocol which is described in co-pending and commonly assigned U.S. Patent Application No. (Number to be assigned) with Attorney Docket Number 55369-015, allows for dynamically changing the throughput of all nxVT connections, based on the real-time traffic loads of applications using the nxVT connections.
  • the DBA protocol allows for the efficient use of the SONET/SDH bandwidth through statistical multiplexing.
  • the same dynamic bandwidth allocation protocol applies to nxSTS-1 and nxAU- 3/nxAU-4.
  • the virtual concatenation invention provides for virtual concatenation, which includes creating a logical connection or pipe by combining multiple, n (where n is a positive integer), STS-1 or NT connections or pipes, which may be contiguous or non-contiguous, into a single connection or pipe, nxSTS-1 or nxNT, respectively, in order to support a connection or pipe with a higher throughput than the throughput of the original STS-1 or NT pipes.
  • the present invention uses dynamic bandwidth allocation protocol used to dynamically manage bandwidth on a ring (or graph of rings) topology. This technology allows for more efficient capacity utilization on a ring (or multiple rings), by rapidly providing ring capacity to individual network elements on demand. As such, high capacity utilization is achieved for arbitrary traffic loading patterns.
  • the present invention provides a system and method of binding MPLS labels to virtually concatenated SO ⁇ ET/SDH transport connections.
  • the present invention By leveraging the control plane semantics of MPLS, the present invention effects a more seamless management solution by allowing a device to participate as a peer in the topology exchange between attached routers at Layer-3 and core transport devices at Layer-2. Embracing this philosophy, the present invention employs MPLS label switched paths (LSP) to establish connections between devices in the transport network (See Internet Engineering Task Force. Extensions to RSVP for LSP Tunnels. IETF Draft Document. September, 1999. http://www.ietf.org/internet-drafts/draft-ietf- mpls-rsvp-lsp-tunnel-04.txt.) (See Internet Engineering Task Force. Constraint Based LSP Setup Using LDP. IETF Draft Document.
  • LSP MPLS label switched paths
  • LSPs label switched paths
  • the worst-case number of LSP required to interconnect network elements on each ring is calculated according to the well-known formula ((( N * ( N - 1 )) / 2 ).
  • the graph can contain fewer vertices, in order to save NT space on the ring.
  • the network operator must establish an explicitly routed LSP tunnel to route traffic between endpoints of a connection that do not share an adjacency.
  • packets traversing these LSP tunnels will endure increased delay and delay variance as a result of the increased hop count. Perhaps more importantly, this case requires that the present invention push and pop labels on the label stack, which will require CPU intervention.
  • LSPs can be configured using either RSNP-LDP or CR-LDP.
  • the essential behavior of these LSPs should be similar in nature to those of ATM Soft-PNCs.
  • the bandwidth allocated for each LSP is calculated according to the following formula:
  • the BW component of the summation above is simply the PIR associated with each connection on each line card of a network element.
  • the accuracy of the value BW could be improved by employing a slightly more sophisticated approach, such as the well-known equivalent bandwidth calculation [Guerin91], which accounts for the effects of statistical multiplexing and aggregate utilization, as well as employing a more realistic source model.
  • the well-known equivalent bandwidth calculation [Guerin91] which accounts for the effects of statistical multiplexing and aggregate utilization, as well as employing a more realistic source model.
  • DBA is managing the bandwidth usage within these LSPs, the amount of oversubscribing actually occurring is not of particular concern.
  • LSP Modification Using CR-LDP Modification ofthe bandwidth associated with an existing LSP begins with the issuance of a LDP Label Request Message by the node requiring more bandwidth.
  • the encoded Type-Length-Nalue (TLN) will contain the newly requested bandwidth values, and the LSP identifier TLN (LSPID TLV).
  • TNL LSP identifier
  • the receiving node On receipt ofthe Label Request Message, the receiving node will detect that the LSPID is identical to that of one ofthe entries in its Incoming Label Map (ILM). If the receiving node did not find such an entry in its ILM, it would simply treat the Label Request Message as a new label request, and process the request in the typical fashion. However, in this case, it will compute the new bandwidth required. The receiving node will reserve only the difference between the original and new bandwidth values, in order to prevent double booking the capacity. As such, this node will temporarily have two labels in its ILM with the same LSPID.
  • ILM Incoming Label Map
  • the initiating node when the initiating node receives the label from its LDP peer, two sets of labels will exist for the same LSPID. As such, the initiating node will now have two outgoing labels for the same FEC. The initiating node can then activate the new label in its FTN and begin the process of releasing the old label, by sending an LDP Label Release Message to its peer.
  • the egress node On receipt ofthe Label Release Message, the egress node will detect that the LSPID has another active label associated with it. As a result, this node will release the old label without deallocating the resources being used by that label.
  • anypoint-to-Anvpoint Laver-3 Connectivity is provided through the use of Layer-3 routing and forwarding.
  • L3 forwarding functionality resides on line cards in the present invention, each packet must contain information that the switch card can use to determine the appropriate line card at the destination endpoint.
  • the present invention appends a tag to the packet by the Layer-3 forwarding engine to specify the line card.
  • This is essentially a tag switching approach. This method will work well on homogeneous rings employing only devices ofthe present invention.
  • the number of tags needed is calculated as the product ofthe total number of NEs (N - 1), line cards (L), and FECs (F):
  • NUMTA GS F X (( N - 1 ) X L )
  • One ofthe essential benefits ofthe present invention functioning as an MPLS LSR lies in its ability to leverage CR-LDP or RSVP-LDP for dynamically resizing the dimension N of NxVT, NxTUl 1, or NxSTS-1 connections.
  • This capability provides a mechanism by which attached LSRs residing at the service provider's Point-of-Presence (POP) can signal the creation, destruction, or resizing of connections on an end-to-end (POP-to- POP) basis.
  • POP Point-of-Presence
  • This capability is afforded by the ability ofthe present invention to function as an LDP peer with attached LSRs. Note that, in the case where the attached router is not an LSR, the method available for dynamic resizing of virtually concatenated connections will leverage native RSVP over IP, rather than CR-LDP or RSVP-LDP.
  • the present invention relates to optical networking. More particularly, the invention relates to a system and method of binding MPLS labels to virtually concatenated SONET/SDH transport connections.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

L'invention concerne un système et un procédé pour l'affectation d'étiquettes à commutation d'étiquette multiprotocole (MPLS) sur des connexions de transport par réseau optique synchrone/hiérarchie numérique synchrone (SONET/HNS). Le système et le procédé reposent sur les étapes suivantes: (1) classification des paquets; et (2) mappage des paquets à même classe d'équivalence vers l'avant sur la même connexion nxVT. Selon une variante, le mappage consiste à (a) associer une certaine largeur de bande de connexion entre un routeur externe et un multiplexeur à insertion/extraction, entre un noeud d'origine et un noeud de destination; et (b) à créer une connexion nxVT entre les noeuds d'origine et de destination - et à établir ainsi un trajet de commutation d'étiquette entre les noeuds d'origine et de destination. Selon une autre variante, le procédé et le système se caractérisent par le mappage de paquets ayant la même étiquette MPLS sur la même connexion nxVT.
PCT/US2001/026533 2000-08-23 2001-08-23 Systeme et procede pour l'affectation d'etiquettes mpls sur des connexions de transport sonet/hns a concatenation virtuelle WO2002017542A2 (fr)

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Application Number Priority Date Filing Date Title
AU2001288396A AU2001288396A1 (en) 2000-08-23 2001-08-23 System and method of binding mpls labels to virtually concatenated sonet/sdh transport connections

Applications Claiming Priority (4)

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US22800800P 2000-08-23 2000-08-23
US60/228,008 2000-08-23
US27279301P 2001-03-01 2001-03-01
US60/272,793 2001-03-01

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WO2002017542A2 true WO2002017542A2 (fr) 2002-02-28
WO2002017542A3 WO2002017542A3 (fr) 2002-05-16

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PCT/US2001/026567 WO2002017580A1 (fr) 2000-08-23 2001-08-23 Architecture de commutation double, destinee aux transports par paquets/circuits melanges sur reseau optique synchrone(sonet)/reseau hierarchique numerique synchrone(sdh)/reseau de multiplexage en longueur d'onde dense(dwdm)
PCT/US2001/026533 WO2002017542A2 (fr) 2000-08-23 2001-08-23 Systeme et procede pour l'affectation d'etiquettes mpls sur des connexions de transport sonet/hns a concatenation virtuelle
PCT/US2001/026542 WO2002017545A2 (fr) 2000-08-23 2001-08-23 Systeme et procede de partage de la largeur de bande nxsts-1 et de protection d'anneau
PCT/US2001/026535 WO2002017544A2 (fr) 2000-08-23 2001-08-23 Protocole d'attribution de largeur de bande dynamique
PCT/US2001/026557 WO2002017546A2 (fr) 2000-08-23 2001-08-23 Systeme et procede de concatenation virtuelle de vt1.5s et sts-1s sur un reseau optique synchrone (sonet), sur un reseau hierarchique numerique synchrone (sdh) et sur un reseau a multiplexage de longueur d'ondes (wdm)
PCT/US2001/026534 WO2002017543A2 (fr) 2000-08-23 2001-08-23 Systeme et procede pour le mappage de paquets de donnees de taille fixe et variable sur sonet et hns

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PCT/US2001/026542 WO2002017545A2 (fr) 2000-08-23 2001-08-23 Systeme et procede de partage de la largeur de bande nxsts-1 et de protection d'anneau
PCT/US2001/026535 WO2002017544A2 (fr) 2000-08-23 2001-08-23 Protocole d'attribution de largeur de bande dynamique
PCT/US2001/026557 WO2002017546A2 (fr) 2000-08-23 2001-08-23 Systeme et procede de concatenation virtuelle de vt1.5s et sts-1s sur un reseau optique synchrone (sonet), sur un reseau hierarchique numerique synchrone (sdh) et sur un reseau a multiplexage de longueur d'ondes (wdm)
PCT/US2001/026534 WO2002017543A2 (fr) 2000-08-23 2001-08-23 Systeme et procede pour le mappage de paquets de donnees de taille fixe et variable sur sonet et hns

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WO2002017580A1 (fr) 2002-02-28
WO2002017546A3 (fr) 2002-08-01
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WO2002017546A2 (fr) 2002-02-28
AU2001286758A1 (en) 2002-03-04
WO2002017544A3 (fr) 2002-05-16
WO2002017544A2 (fr) 2002-02-28
WO2002017543A2 (fr) 2002-02-28
WO2002017545A3 (fr) 2002-05-30
WO2002017543A3 (fr) 2002-05-30
AU2001288398A1 (en) 2002-03-04
AU2001288406A1 (en) 2002-03-04
WO2002017545A2 (fr) 2002-02-28
WO2002017542A3 (fr) 2002-05-16
AU2001290570A1 (en) 2002-03-04

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