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               ATM UNI Signaling Support for IP over ATM

                              Work By:

                           Maryann Perez
                           Dan Grossman
                           Fong Liaw
                           Allison Mankin
                           Eric Hoffman
                           Andy Malis


------------------------------------------------------------------------
                               Goals

- Implementors guide on the use of UNI signaling to support Classical
  IP over ATM
- Promote interoperability
- Start with RFC 1577 (RFC 1483 LLC/SNAP)
  - also support RFC 1483 null encapsulation
- Evolve...
                                -1-

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                          Signaling Procedures

- Host A sends "setup" via ATM switch to Host B.
  Host B "connects" to confirm connection
  Hosts can then later "release" the connection

                                -2-

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                         Overview of Draft

- Information Elements
  - Significance to ATM endpoints
     Encapsulation
     Protocol Layering
  - Significance to ATM network and endpoints
- Protocol Procedures
  - VCs handling procedures (as per Andy Malis)
- Call failure procedures

                                -3-

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                          Information Elements

- Mandatory
  - AAL Parameters
  - ATM Traffic Descriptor (ATM User Cell Rate)
  - Broadband Bearer Capability
  - Broadband Low Layer Information
  - QOS Parameters
  - Called Party Number
  - Calling Party Number
- Optional
  - Transit Network Selection
  - Called Party Subaddress
  - Calling Party Subaddress

                                -4-

------------------------------------------------------------------------

                          A Sample Setup 


    +-----------------------------------------------------------------+

     Information Elements/
       Fields                         Value/(Meaning)                 
     --------------------             ---------------

     aal_params
       aal_type                       5        (AAL 5)        
       fwd_max_sdu_size_ident         140
       fwd_max_sdu_size               9188     (default, send IP MTU value)
       bkw_max_sdu_size_ident         129
       bkw_max_sdu_size               9188     (default, recv IP MTU value)
       mode identifier                131 *
       mode                           message *
       sscs_type identifier           132
       sscs_type                      0        (null SSCS)

     user_cell_rate
       fwd_peak_cell_rate_0_1_ident   132
       fwd_peak_cell_rate_0_1         (link rate)
       bkw_peak_cell_rate_0_1_ident   133
       bkw_peak_cell_rate_0_1         (link rate)
       best_effort_indication         -

     bb_bearer_capab
       spare                          0
       bearer_class                   16       (BCOC-X)
       spare                          0
       traffic_type                   0        (no indication)
       susceptibility_to_clipping     0        (not_susceptible_to_clipping)
       timing_reqs                    0        (no indication) 

     bb_low_layer_info
       layer_2_id                     2    
       user_information_layer         12       (lan_llc (ISO 8802/2)

     qos_params
       qos_class_fwd                  0        (class_0)
       qos_class_bkw                  0        (class_0)

     called_party_number
       type_of_number                 (international_number / unknown)
       addr_plan_ident                (ISDN / ISO NSAPA)
       number                         (E.164 / OSI NSAPA)

     calling_party_number
       type_of_number                 (international_number / unknown)
       addr_plan_ident                (ISDN / ISO NSAPA)
       presentation_indic             (presentation_allowed)
       spare                          0
       screening_indic                (user_provided_verified_and_passed)
       number                         (E.164 / OSI NSAPA)

   +--------------------------------------------------------------------+
                       Sample contents of SETUP message


   [* : optional, ignored if present]

                                -5-

------------------------------------------------------------------------

                           VC management


             |
             | APPLICATION                           --> UUI
             |
             |--------
             |TCP|UDP|                               --> B-HLI
             |----------------------
             |    IP +    |  ARP   |                 --> B-LLI, ONLI
             |--------\-------------------
             |         \  LLC    +       |           --> B-LLI
             |----------\---------\---------------
             |           \    ATM  \             |
             |------------\---------\-------------
                           \         \ 
                            \         \ 
                             \        VC''
                             VC'


   + bind 

                                -6-
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                            What next?

- Information RFC
  - Support only RFC 1577? Multiprotocol?

- More difficult signaling issues ahead as ATM Forum's specification
  progresses

                                -7-
------------------------------------------------------------------------