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IPW-5Rev1 1 Overview of Routing & Interworking Plans for Fixed & Mobile Networks ITU-T Study Group 2 (Network & Service Operations) Question 2 (Routing)

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Presentation on theme: "IPW-5Rev1 1 Overview of Routing & Interworking Plans for Fixed & Mobile Networks ITU-T Study Group 2 (Network & Service Operations) Question 2 (Routing)"— Presentation transcript:

1 IPW-5Rev1 1 Overview of Routing & Interworking Plans for Fixed & Mobile Networks ITU-T Study Group 2 (Network & Service Operations) Question 2 (Routing) qareas of responsibility qcurrent work in progress qinteractions with IETF and ATMF qplanned activities Gerald Ash, Rapporteur, Q.2/2 Tel: Fax:

2 2 Areas of Responsibility qtraffic routing vE.170 (Traffic Routing) vE.171 (International Telephone Routing Plan) vE.350 (Dynamic Routing Interworking) vE.352 (Routing Guidelines for Efficient Routing Methods) vE Routing of Calls When Using International Routing Addresses qrouting across circuit-based & packet-based networks vE.177 (B-ISDN Routing) vE.351 (Routing of Multimedia Connections Across TDM-, ATM-, & IP-Based Networks) qmobile network routing vE.173 (Routing Plan for Interconnection Between Public Land Mobile Networks and Fixed Terminal Networks)

3 3 Current Work in Progress qE Dynamic Routing Interworking qE Routing of Multimedia Connections Across TDM-, ATM-, & IP-Based Networks qE Routing Guidelines for Efficient Routing Methods qE Routing of Calls When Using International Routing Addresses

4 4 E Dynamic Routing Interworking qprovides for interworking among all dynamic route selection methods vincludes DNHR, RTNR, DCR, RINR, WIN, DAR, STR, STT, DADR, ODR, & future methods vroute selection method not being standardized qrecommends the signaling & information-exchange parameters required to support interworking vSETUP-VDL: the via & destination switch list (VDL) parameter in the SETUP message specifies all via switches (VSs) & destination switch (DS) in path vSETUP-RES: the reservation (RES) parameter in SETUP message specifies the level of circuit reservation applied at VSs vRELEASE-CB: the crankback (CB) parameter in RELEASE message sent from VS or DS to originating switch (OS) to allow further alternate routing at OS vQUERY: provides OS to DS or OS to routing processor (RP) status request vSTATUS: provides OS/VS/DS to RP or DS to OS status information vRECOM: provides RP to OS/VS/DS routing recommendation

5 5 E Routing of Multimedia Connections Across TDM-, ATM-, & IP-Based Networks qrecommends established routing functionality within network type(s) for application across network types, including: qnumber/name translation & routing vE.164-NSAP based number translation/routing applied in TDM- & ATM-based networks qrouting table management vautomatic generation of routing tables based on network topology & status applied in TDM-, ATM- & IP-based networks vautomatic update & synchronization of topology databases applied in ATM- & IP- based networks qroute selection vfixed route selection applied in TDM-, ATM-, & IP-based networks vdynamic route selection (event dependent, state-dependent, time-dependent) applied in TDM-based networks qQoS resource management applied in TDM-based networks vbandwidth allocation & protection applied in TDM-based networks vpriority routing applied in TDM-based networks vpriority queuing applied in ATM- & IP-based networks

6 6 E Routing of Multimedia Connections Across TDM-, ATM-, & IP-Based Networks (Continued) qrecommends the signaling & information-exchange parameters required to support the recommended routing methods, including: qnumber/name translation & routing vE.164-NSAP: address parameter in the connection setup information element (IE) for routing to destination node (DN) vINRA: international network routing address (INRA) parameter in setup IE for routing to DN vIP-ADR: IP address (IP-ADR) parameter in setup IE for routing to DN vCIC: call identification code (CIC) parameter in setup IE for routing to DN qrouting table management vHELLO: parameter provides for identification of links between network nodes vTSE: topology-state-element (TSE) parameter provides for the automatic updating of nodes, links, and reachable addresses in the topology database vRQE: routing-query-element (RQE) parameter provides for the originating node (ON) to DN or ON to routing processor (RP) link- and/or node-status request vRSE: routing-status-element (RSE) parameter provides for a node to RP or DN to ON link and/or node status information vRRE: routing-recommendation-element (RRE) parameter provides for an RP to node routing recommendation

7 7 E Routing of Multimedia Connections Across TDM-, ATM-, & IP-Based Networks (Continued) qrecommends the signaling & information-exchange parameters required to support the recommended routing methods, including: qroute selection vDTL/ER: designated-transit-list/explicit-route (DTL/ER) parameter in the setup IE specifies each via node (VN) and the DN in the route vCBK/BNA: crankback/bandwidth-not-available (CB/BNA) parameter in the connection release IE sent from VN to ON or DN to ON; allows for possible further alternate routing at ON qQoS resource management vQoS-PAR: QoS parameter (QoS-PAR) in the setup IE includes QoS thresholds (e.g., transfer delay, delay variation, packet loss) used at VN to compare link QoS performance to requested QoS threshold vTRAF-PAR: traffic-parameter (TRAF-PAR) in the setup IE (e.g., average bit rate, maximum bit rate, minimum bit rate) used at VN to compare link characteristics to requested TRAF-PAR thresholds vDoS: depth-of-search (DoS) parameter in the setup IE used at VN to compare link load state to allowed DoS threshold vMOD: modify (MOD) parameter in the setup IE used at VN to modify existing traffic parameters on an existing connection vDIFFSERV: differentiated-services (DIFFSERV) parameter is used to designate the relative priority and management policy of queues

8 8 E Routing Guidelines for Efficient Routing Methods qrecommends use of dynamic bandwidth reservation on shortest paths to maintain efficient bandwidth use and throughput vprevents inefficient routing under congestion which can lead to network instability and drastic throughput loss qrecommends use of event-dependent routing (EDR) path selection methods to reduce flooding overhead and maintain performance vprovides alternative to state-dependent routing (SDR) path selection with flooding/LSAs which can lead to large processing overheads and smaller area/AS size qillustrates use of dynamic bandwidth reservation & EDR methods qplan to extend to recommendations applicable to packet network traffic- engineering/management such as MPLS/traffic-engineering

9 9 E Routing Calls when Using International Network Routing Addresses qrecommends an addressing plan for routing calls based on E.164 number translation to an international network routing address vavoids work-around for using E.164 numbers as routing addresses vavoids unnecessary allocation of E.164 numbers for routing purposes vprovides originating network identification useful for routing (e.g., based on language of originating user) qaddressing plan & formats being worked jointly with numbering question (Q 1/2) qdefines an international network routing address (INRA) format vserving network translates E.164 -> INRA vformat includes a 3-digit country code, a 5-digit network routing address (NRA), and a 2-digit sub-address vNRA identifies service provider network qdefines a serving network identification code (SNID) format vuses same format as INRA vNRA identifies the serving network qrecommends that INRA, SNID, and dialed number (DN) be carried within separate information elements in the call setup message

10 10 Interactions with IETF and ATMF Based on Recommendation E.351 (Routing of Multimedia Connections Across TDM-, ATM-, and IP-Based Networks) q5 drafts submitted to IETF qpresentations made to IETF Routing Area (1), MPLS working group (2) vhas led to positive discussions & collaborations with IETF routing experts vhas led to bandwidth-modification & priority-routing functionality in MPLS protocol RFCs q3 contributions submitted to ATMF qpresentations made to ATMF routing/addressing & control signaling (RA/CS) working group (1), ATMF traffic management (TM) working group vhas led to positive discussions & collaborations with ATMF routing experts vhas led to bandwidth-modification & priority-routing functionality in UNI/PNNI/AINI protocol specifications

11 11 Interactions with IETF Based on Recommendation E.351 QoS Resource Management qcapabilities vallows integration of network services vprovides automatic bandwidth allocation & protection vprovides service differentiation (e.g., priority routing services such as 800 gold & international priority routing) vqueuing priority applied to achieve service differentiation qanalogous methods applied in PSTNs with TDM technology over the past decade vimproved performance quality & reliability vadditional revenue & revenue retention vreduced operations & capital cost vallows fast feature introduction with standardized routing platform qhas led to needed MPLS extensions v

12 12 Interactions with IETF and ATMF Based on Recommendation E.352 (Routing Guidelines for Efficient Routing Methods) qdraft submitted to IETF qpresentations made to MPLS working group (1) & traffic- engineering working group (1) vhas led to positive discussions & collaborations with IETF routing experts qproposed next steps vinclude guidelines in Traffic Engineering Framework draft vprovide comprehensive informational draft on TE & QoS methods for multiservice networks vinclude guidelines in IGP TE requirements, as appropriate vuse guidelines to define any needed MPLS/TE MIB objects, as appropriate

13 13 Planned Activities qtraffic-engineering/management methods for new network applications & technologies vprovide comprehensive contributions/drafts on traffic-engineering & QoS methods for multiservice networks vsupport new service applications, such as multimedia, on an integrated, shared network vsupport new technologies such as IMT-2000 qdynamic routing methods for new network applications & technologies vprovide needed extensions to IP-, ATM-, and TDM-based capabilities to support QoS, performance, & other needs for new applications & technologies qintelligent network (IN) routing methods for new network applications & technologies vprovide needed extensions to IP-, ATM-, and TDM-based capabilities to support IN routing capabilities for new applications & technologies

14 14 Planned Activities (continued) qmobile routing extensions vreflect issues such as tracking of routing address mapping of E.164 numbers/names to IP addresses vreflect interworking of fixed, wireless, and portable terminals across various technologies, including IP-, ATM-, & TDM-based networks vcomplement existing recommendations on mobile system identity and global title derivation (E.212/E.214) qopen routing application programming interface (API) vaddress the connection management routing parameters which need to be controlled through an applications interface

15 15 Backup Slides

16 16 Example of Multimedia Connection Across TDM-, ATM-, & IP-Based Networks qneed for standard routing functionality between networks (includes addressing, route selection, QoS resource management, signaling/information exchange) qextend established routing methods for application across network types & within TDM-, ATM, & IP-based PSTNs PC TDM-BASED NETWORK A a2 IP-BASED NETWORK B ATM-BASED NETWORK C a1 c2 c1 b2 b1 b2 b1 a3 Switch/Router Gateway Switch/Router LEGEND

17 17 TDM-Based Routing Experience Applicable to E.351 qdynamic path selection vstate-dependent routing (SDR), event-dependent routing (EDR), & time- dependent routing (TDR) path selection widely implemented vapplied in national, international, metropolitan area, & private networks vapplied successfully to large fraction of PSTN traffic over past 2 decades vdynamic bandwidth reservation important for network stability vevent dependent path selection (e.g., success to the top) can be nearly as effective as state dependent path selection, but simpler vcrankback very efficient in path selection & replaces need for real-time link state flooding vachieves improved performance at lower cost qQoS resource management vprovides automatic bandwidth allocation, bandwidth protection, & priority routing vused successfully in PSTNs over the past decade

18 18 TDM-Based Routing Experience Applicable to E.351 qbenefits of dynamic path selection & QoS resource management vperformance quality (reduced blocking, improved reliability, robustness to failure, reduced connection set-up delay, improved transmission quality) vservice flexibility (fast feature introduction with standardized routing platform, capacity sharing among services on integrated network, new differentiated (e.g., priority routing) services introduced) vadditional revenue & revenue retention (increased call completions, reliability protects of revenue at risk, new services such as priority routing) vcost reduction (lower transmission & switching costs with advanced design, lower operations expense with automated, centralized operations, lower capacity churn, automatic routing administration)

19 19 IP- & ATM-Based Routing Experience Applicable to E.351 qstandards-based protocols for routing, signaling, provisioning (OSPF, BGP, MPLS, PNNI, etc.) vsignaling supports source routing with DTL/ER & crankback vsignaling supports QoS routing functionality qnetwork operations vautomatic provisioning of links, switches, reachable addresses (with OSPF, PNNI, etc.) vnetwork provisioning & maintenance benefits from fewer links in sparse network topology qvoice, data, multimedia service integration vachieved with IP- & ATM-based routing protocols

20 20 IP- & ATM-Based Routing Experience Applicable to E.351 qnetwork efficiency vsparse topology & flat-network routing take advantage of lower costs of hi-speed (OC3/OC12/OC48) transport links & switch terminations vsparse hi-speed-link design has economic benefit (20-30%) compared to mesh-based design qnetwork performance vsparse hi-speed-link design has some performance benefit under overload due to full sharing of network capacity

21 21 Illustrative QoS Resource Management Method qdistributed method applied on a per-virtual-network basis qingress LSR (ILSR) allocates bandwidth to each virtual-network (VN) based on demand qfor VN bandwidth increase vILSR decides link-bandwidth-modification threshold (Pi) based on –bandwidth-in-progress (BWIP) –routing priority (key, normal, best-effort) –bandwidth allocation BWavg –first/alternate choice path vILSR launches a CRLDP label request message with explicit route, modify-flag, traffic parameters, & threshold Pi (carried in setup priority) VOICE ISDN DATA WIDEBAND VOICE ISDN DATA WIDEBAND ILSRVLSRELSR

22 22 Illustrative QoS Resource Management Method (continued) qvia LSRs (VLSRs) keep local link state of idle link bandwidth (ILBW), including lightly loaded (LL), heavily loaded (HL), reserved (R), & busy (B) qVLSRs compare link state to Pi threshold qVLSRs send bandwidth-not-available notification message to ILSR if Pi threshold not met

23 23 Example for CRLSP Bandwidth Modification


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