Basic question on "cell mode MPLS" and "frame mode MPLS"
Folks, the difference between MPLS frame mode vs MPLS cell mode is that the cell mode is applied in ATM (which operated with fixed size cells)? Then the frame mode term is related to the PDU "frame" which is how data is transmitted at layer 2. Is that all?
Re: Basic question on "cell mode MPLS" and "frame mode MPLS"
In most cases you have frame mode MPLS. In this mode MPLS typically adds its own header information (MPLS shim header) between the Layer 2 header and the Layer 3 header.
In ATM networks you can run either frame mode MPLS or cell mode MPLS. In a typical ATM setup you have routers at endpoints and an ATM cloud between the routers. The ATM cloud consists of ATM switches. The difference between the modes has to do with the capability of the intermediate ATM switches to speak MPLS.
If the ATM switches don't speak MPLS, you can run frame mode MPLS between the routers at the level say of ATM AAL5 PDUs (instead of cells) and this is transparent to the ATM switches (the switches do not know you run MPLS over them). If the intermediate ATM switches do speak MPLS, then you could run cell mode MPLS with the MPLS label information being mapped to the VPI/VCI field of the ATM cells.
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