TDM%20over%20PSN-MIB

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TDMover PSN-MIB

• Orly Nicklass IETF 59
• RAD Data Communications

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• Scope
• Design Issues
• Model
• TDM MIB
• SATOP MIB
• Additional Requirements

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MIB Module Scope
Providers Packet Switched Network (PSN)
Customer Edge (CE)
Customer Edge (CE)
Customer Edge (CE)
Provider Edge (PE)
Provider Edge (PE)
Customer Edge (CE)
Customer Edge (CE)
native Service TDM
native Service TDM
PseudoWires (PWs)
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Design issues

• According to Sec. 8 of PW-ARCH doc, the MIB
  module scope should be used to interface or adapt
  the emulated service onto the PWE3 management
  framework, that is mapping the services to the
  underlying PSN that carries the PWE3 service.
• Fit with current architecture and comply with
  PWE3 TDM Requirements document.
• Add the minimum that is missing to fully manage
  the TDM PW services by using as many of the MIB
  modules that are already available.
• Report the status of the interface and tabulate
  statistics to monitor the state of the network.
• Provide data for measurement of service level
  agreements (SLAs).
• Provide configuration capability for connections.
• Support connection verification mechanism as well
  as other alarm mechanisms that can alert the
  operator regarding the current status of the PW
  connection.

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MIB Modules Layering Model as described in
PW-ARCH

• Service Ethernet
  ATM
• Layer Service
  MIB ... Service MIB
• Generic PW Generic PW MIB
  
• Layer
• PSN VC L2TP VC MIB
  MPLS VC MIB
• Layer
• PSN L2TP MIB(s)
  MPLS MIB(s)
• Layer

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In Practice (5 layers)

• 1- Native technology Ethernet MIB(s)
  ATM MIB(s)
• Layer
• 2- Service Ethernet
  ATM
• Layer Service
  MIB ... Service MIB
• 3- Generic PW Generic PW MIB
  
• Layer
• 4- PSN VC L2TP VC MIB
  MPLS VC MIB
• Layer
• 5- PSN L2TP MIB(s)
  MPLS MIB(s)
• Layer

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PSN Layer MIB(s)

• The MIBs in this layer are produced by other
  working groups that design and specify the native
  PSN services.

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PSN VC Layer MIB(s)

• The MIB provides a means with which an operator
  can map the PW service onto the native PSN
  service.

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Generic PW MIB (s)

• These MIB(s) are responsible for providing
  general PWE3 counters and service models used for
  monitoring and configuration of PWE3 services
  over any supported PSN service. That is, this
  MIB provides a general model of PWE3 abstraction
  for management purposes.
• This MIB is used to interconnect the Service
  Layer MIBs to the PSN VC Layer MIB(s).

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Service Layer (TDM)

• Manages the following TDM circuits belonging to
  the PDH hierarchy
• Unstructured TDM
• TDM that consists of a raw bit-stream of rate
  defined in G.702,
• with all bits are available for payload.
• Structured TDM
• TDM with one ore more levels of structure
  delineation, including
• frames, channelization, and multiframes (e.g.
  as defined in G.704,
• G.751, T1.107).

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Cont

• Structure-Agnostic Transport
• Transport of unstructured TDM, or of
  structured TDM when the
• structure is deemed inconsequential from the
  transport point of view.
• In structure-agnostic transport any structural
  overhead that may be
• present is transparently transported along
  with the payload data, and
• the encapsulation provides no mechanisms for
  its location or
• utilization.
• Structure-agnostic transport is considered for
  the following signals
• E1 as described in G.704.
• T1 (DS1) as described in G.704.
• E3 as defined in G.751.
• T3 (DS3) as described in T.107.

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Cont

• Structure-Aware Transport
• Transport of structured TDM taking at least
  some level of the
• structure into account. In structure-aware
  transport there is no
• guarantee that all bits of the TDM bit-stream
  will be actually
• transported over the MPLS network
  (specifically, the synchronization
• bits and related overhead may be stripped at
  ingress and usually will
• be regenerated at egress), or that bits
  transported are always
• situated in the packet in their original
  order.
• Structure-aware transport is considered for the
  following signals
• E1/T1 with one of the structures imposed by
  framing as described in G.704
• NxDS0 with or without CAS

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Service Layer MIB(s)

• According the described definition, there will
  be 4 MIB modules
• PW-TDM-MIB,
• PW-SATOP-MIB,
• PW-TDMOIP-MIB,
• PW-CESOPSN-MIB

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Native Technology Layer

• The MIBs in this layer are produced by other
  working groups that design and specify the native
  service without PW emulation.
• For TDM native services the following MIB(s) are
  used
• DS1MIB " Definitions of Managed Objects for
  the DS1, E1, DS2 and E2 Interface Types",
  ltdraft-ietf-atommib-rfc2495bis-06.txtgt,
• work-in-progress.
• DS3MIB "Definitions of Managed Objects for the
  DS3/E3 Interface Types",
• ltdraft-ietf-atommib-rfc2496bis-05.
  txtgt. work-in-progress.
• RFC2494"Definitions of Managed Objects for the
  DS0 and DS0Bundle Interface Types", RFC 2494,
  January 1999.

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TDM MIB

• The MIB consists of five tables
• The TDM PW Table pwVcTDMTable
• The TDM generic configuration Table
  pwVcTDMCfgTable
• The TDM Performance Current Table
  pwVcTDMPerfCurrentTable
• The TDM Performance Interval Table
  pwVcTDMPerfIntervalTable
• The TDM Performance Table pwVcTDMPerfTable

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• TDM PW Table pwVcTDMTable
• Contains generic TDM information regarding the
  PW connection.
• - the ifIndex of the TDM interface,
• - a pointer to an entry in the generic
  configuration table (pwVcTDMCfgTable),
• - a pointer to an entry in the specific
  configuration table (pwVcXXXCfgTable, where XXX
  can be SAToP or TDMoIP or CESoPSN),
• - configuration error indications,
• - and various status indications.
• The two pointers of the two configuration tables
  are providing the connection
• parameters. The TDM interface can be a full link
  of any TDM type
• like E1 or DS3 for example, or the interface of
  the bundle holding
• the collection of time slots to be transmitted.

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• TDM generic parameter Table pwVcTDMCfgTable
• Contains TDM generic configurable parameters
  for any TDM Type.
• TDM Performance Current Table pwVcTDMPerfCurrentTa
  ble
• Contains TDM statistics for the current
  15-minute period.
• TDM Performance Interval Table pwVcTDMPerfInterval
  Table
• Contains TDM statistics for historical
  intervals (usually 96 15-
• minute entries to cover a 24 hour period).
• TDM Performance Table pwVcTDMPerfTable
• Contains TDM stats for statistics accumulated
  since the TDM PW was first established.

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pwVcTDMTable

• pwVcTDMType
  INTEGER,
• pwVcTDMIfIndex
  InterfaceIndexOrZero,
• pwVcGenTDMCfgIndex
  PwVcTDMCfgIndex,
• pwVcRelTDMCfgIndex
  PwVcTDMCfgIndex,
• pwVcTDMAvePktLossTimeWindow
  Integer32,
• pwVcTDMConfigError BITS,
• pwVcTDMTimeElapsed
  Integer32,
• pwVcTDMValidIntervals
  Integer32,
• pwVcTDMCurrentIndications BITS,
• pwVcTDMLatchedIndications BITS,
• pwVcTDMLastEsTimeStamp TimeStamp

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pwVcTDMCfgTable

• pwVcTDMCfgIndex
  PwVcTDMCfgIndex,
• pwVcTDMCfgRowStatus
  RowStatus,
• pwVcTDMCfgConfErr
  BITS,
• pwVcTDMCfgPayloadSize
  Unsigned32,
• pwVcTDMCfgPktReorder
  TruthValue,
• pwVcTDMCfgRtpHdrUsed
  TruthValue,
• pwVcTDMCfgJtrBfrDepth
  Unsigned32,
• pwVcTDMCfgPayloadSuppression
  INTEGER,
• pwVcTDMCfgStorageType
  StorageType

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pwVcTDMPerfCurrentTable

• pwVcTDMPerfCurrentMisOrder
  Counter32,
• pwVcTDMPerfCurrentPktsOoseq
  Counter32,
• pwVcTDMPerfCurrentJtrBfrUnderruns
  Counter32,
• pwVcTDMPerfCurrentJtrBfrOverruns
  Counter32,
• pwVcTDMPerfCurrentMalformedPkt
  Counter32,
• pwVcTDMPerfCurrentESs
  PerfCurrentCount,
• pwVcTDMPerfCurrentSESs
  PerfCurrentCount,
• pwVcTDMPerfCurrentUASs
  PerfCurrentCount,
• pwVcTDMPerfCurrentFC
  PerfCurrentCount

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pwVcTDMPerfIntervalTable

• pwVcTDMPerfIntervalNumber
  Unsigned32,
• pwVcTDMPerfIntervalValidData
  TruthValue,
• pwVcTDMPerfIntervalDuration
  Integer32,
• pwVcTDMPerfIntervalMisOrder
  Counter32,
• pwVcTDMPerfIntervalPktsOoseq
  Counter32,
• pwVcTDMPerfIntervalJtrBfrUnderruns
  Counter32,
• pwVcTDMPerfIntervalJtrBfrOverruns
  Counter32,
• pwVcTDMPerfIntervalMalformedPkt
  Counter32,
• pwVcTDMPerfIntervalESs
  PerfIntervalCount,
• pwVcTDMPerfIntervalSESs
  PerfIntervalCount,
• pwVcTDMPerfIntervalUASs
  PerfIntervalCount,
• pwVcTDMPerfIntervalFC
  PerfIntervalCount

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pwVcTDMPerfTable

• pwVcTDMPerfMisOrder
  Counter32,
• pwVcTDMPerfPktsOoseq
  Counter32,
• pwVcTDMPerfJtrBfrUnderruns
  Counter32,
• pwVcTDMPerfJtrBfrOverruns
  Counter32,
• pwVcTDMPerfMalformedPkt
  Counter32,
• pwVcTDMPerfESs
  Counter32,
• pwVcTDMPerfSESs
  Counter32,
• pwVcTDMPerfUASs
  Counter32,
• pwVcTDMPerfFC
  Counter32,
• pwVcTDMPerfDiscontinuityTime TimeStamp

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SAToP MIB

• The MIB consists of one table
• The SAToP PW Configuration Parameter Table
  pwVcSatopCfgTable.
• It contains objects for PW connection
  characteristics. In situations where sets
• of objects are common amongst few PW
  connections, a single entry may
• be referenced by many PW connection entries in
  pwVcTDMTable

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pwVcSatopCfgTable

• pwVcSatopCfgIndex
  PwVcTDMCfgIndex,
• pwVcSatopCfgRowStatus
  RowStatus,
• pwVcSatopCfgConsecPktsLoss2Normal
  Unsigned32,
• pwVcSatopCfgConsecMissPktNorma2Loss
  Unsigned32,
• pwVcSatopCfgPktReplacePolicy
  INTEGER,
• pwVcSatopCfgTDMDataSetUp2Synch
  Unsigned32,
• pwVcSatopCfgSetUp2SynchTimeOut
  Unsigned32,
• pwVcSatopCfgAlarmThreshold
  Unsigned32,
• pwVcSatopCfgClearAlarmThreshold
  Unsigned32,
• pwVcSatopCfgExcessivePktLossThreshold
  Unsigned32,
• pwVcSatopCfgMissingPktsToSes
  Unsigned32,
• pwVcSatopCfgTimestampMode
  INTEGER,
• pwVcSatopCfgStorageType
  StorageType

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Additional Requirements

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PW TC MIB

• PwVcType TEXTUAL-CONVENTION
• STATUS current
• DESCRIPTION
• "Indicate the PW type (i.e. the carried
  service). "
• SYNTAX INTEGER
• other(0),
• frameRelayDlci(1),
• atmAal5SduVcc(2),
• atmTransparent(3),
• ethernetTagged(4),
• ethernet(5),
• hdlc(6),
• ppp(7),
• cem(8), -- old format
• atmCellNto1Vcc(9),
• atmCellNto1Vpc(10),
• ipLayer2Transport(11),
• atmCell1to1Vcc(12),
• atmCell1to1Vpc(13),

Need to add the value TDM
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TDM SATOP MIB

• Add relevant Notifications for each MIB module