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MPLS over ATM - VP Tunnel (cell) or VC (frame)?

Does anybody use the MPLS over VP tunnel with the Cisco 8540 ATM MPLS core? Is it a stable solution or one should better leave the ATM MPLS cell mode and convert to frame mode over ATM?


Re: MPLS over ATM - VP Tunnel (cell) or VC (frame)?

Both Cell mode and frame mode are stable solutions. But the scenario where we use them are different. I see that Cisco 8540 ATM MPLS Core is used. In this case, I would say that cell mode MPLS is a better solution for the following reason(s); In normal (non-MPLS) ATM core the L2 topology might be different from L3 topology. Say for example, a destination IP (a.b.c.d) might be shown as 3 hops (routers) away but there can be even 10 or more ATM switches in between. In this case the L2 topology might not be an optimal path. Hence we go for cell mode operation, where we form a full mesh topology and hence an optimal path.

New Member

Re: MPLS over ATM - VP Tunnel (cell) or VC (frame)?

Its not the question of stability rather than your network design.Frame mode is the default in routers.

It will be a good idea to go for Frame mode from network integration and scalable design point of view.

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