Cell-mode MPLS / IP routing

[chrisayres]

I am studying for CCIP and with my limited knowledge of ATM there is something a don't understand.

When running cell-mode MPLS over an MPLS aware ATM network are the ATM switches acting as layer 3 routers. If so how.

[mheusinger]

Hi,

yes one converts ATM switches into routers, so to say. Data plane will still be ATM cell switching. But the control plane is modified and VC setup is controlled by IP routing and LDP.

One can add the IP routing and LDP capability by adding software to IOS based ATM switches (like 8540) or by adding a real router as Label switch controller (f.e. 7200/RPM to BPX or MGX).

Hope this helps

Martin

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