The MPLS-OPS Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Re: ATM Label stack processing
----- Original Message ----- From: "John Black" <john_black66@hotmail.com> To: <javier.antich@telindus.es>; <mpls-ops@mplsrc.com> Sent: Thursday, June 28, 2001 5:51 AM Subject: RE: ATM Label stack processing > > 1.Does it mean that every ATM switch has to reassemble AAL5 frame to >read > > the next label from the stack? > [Javier Antich] ATM switches acting as LSRs do not need to read the >next label. They do only ATM switching based on the VPI/VCI values with are >the MPLS outer-most label. Ok Let see it step by step: 1.LER pops up label stack 2.First ATM switch (LSR) gets a cell on VPI/VCI A (where A is top most label). 3. ATM LSR swaps the label A with what? How intermidiate atm LSRs know where to send ATM cell to if they cannot read the stack? How LSP is setup? Definitely, an edge ATM-LSR, which may be located in the boundary between ATM-LSR domain and IP-LSR domain such as POS or Ethernet-based MPLS network, should be able to reassemble AAL5 frame to get the next label or an IP packet from the label stack. _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. ------- The MPLS-OPS Mailing List Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml Archive: http://www.mplsrc.com/mpls-ops_archive.shtml ------- The MPLS-OPS Mailing List Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml Archive: http://www.mplsrc.com/mpls-ops_archive.shtml
|
|