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How much extra overhead is there with a cisco VPN tunnel? Do I lose bandwidth capacity

If I setup a VPN tunnel with a 100 Mbps ISP connection on both ends.  Is it safe to say my VPN tunnel link has a bandwidth capacity of 100 Mbps?  What are the pros and cons of using a VPN tunnel vs. using a MPLS link of smaller bandwidth capacity?

1 Solution
With the Cisco VPN you can loose up to 10-13% of your bandwidth for overhead.  MPLS is the way to go.  you are not limited in what you can send over the pipe and overhead is way less.  Most ISP/Phone companies switched to MPLS years ago as they can do long haul voice and data trunking over it without having to buy LD or data drains from tier 1 providers.
Istvan KalmarHead of IT Security Division Commented:

HOW many is the MTU on the ISP, what type of VPN do you use?
FREDARCEAuthor Commented:
We are most likely going to have Cisco ASA's on both ends.  The mtu on all interfaces are set to 1500
We are looking to use AES-256 bit encryption.
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