ITU-T Compromised Solution on ATM MPLS NETWORK INTERWORKING - - PowerPoint PPT Presentation

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ITU-T Compromised Solution on ATM MPLS NETWORK INTERWORKING - - PowerPoint PPT Presentation

Jan 05, 2023 168 likes •252 views

ITU-T Compromised Solution on ATM MPLS NETWORK INTERWORKING (Pseudo Wire Emulation) Ghassem Koleyni Nortel Networks ghassem@nortelnetworks.com Phone : +1 613 763 4154 1 of 8 ITU-T ATM-MPLS Network Interworking Provides network

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ITU-T Compromised Solution on ATM – MPLS NETWORK INTERWORKING (Pseudo Wire Emulation)

Ghassem Koleyni Nortel Networks ghassem@nortelnetworks.com Phone : +1 613 763 4154

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ITU-T ATM-MPLS Network Interworking Provides network interworking between ATM cells and AAL5 frames with MPLS: Cell mode Encapsulations, two modes:

  • One ATM connection to one Interworking LSP (one-to-one mode)
  • n ATM connections to one Interworking LSP (n-to-one mode)

Frame mode Encapsulations, two modes:

  • AAL5 PDU
  • AAL5 SDU
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MPLS transport label= PSN Transport Header in PWE3 Interworking label=Pseudo Wire Header in PWE3 Common interworking indicators* ~ ATM Control Word in PWE3 ATM-MPLS interworking specific header* Payload General Encapsulation Format * Not four octets for all cases

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Cell mode encapsulation (one-to-one mode)

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MPLS transport label= PSN Transport Header in PWE3 Interworking label=Pseudo Wire Header in PWE3 Length Sequence Number

M V

Res PTI C

ATM Payload (48 octets) One ATM connection to one Interworking LSP (one-to-one mode) for a single cell (VCC)

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MPLS transport label= PSN Transport Header in PWE3 Interworking label=Pseudo Wire Header in PWE3 Reserved Length Sequence number VPI VCI PTI C ATM Payload (48 octets) VPI VCI PTI C ATM Payload (48 octets) n ATM connections to one Interworking LSP (n-to-one mode)

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AAL5 PDU

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MPLS transport label= PSN Transport Header in PWE3 Interworking label=Pseudo Wire Header in PWE3 Length Sequence Number

M V

Res FR G E C

16 bits VCI + Payload

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AAL5 SDU

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MPLS transport label= PSN Transport Header in PWE3 Interworking label=Pseudo Wire Header in PWE3

Reserved T E L C Res Length

Sequence number Payload

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Cell mode encapsulations are explained in ITU-T draft Recommendation Y.atmplsC AAL5 mode encapsulations are explained in ITU-T draft Recommendation Y.atmplsF These documents can be found at: http://www.itu.int/itu-t/studygroups/com13/ip/sg13-ietf-ftp.html