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New Member

VTI vs GRE

Which one would you prefer, VTI or GRE?

As far as I know, VTI has less overhead, less configuration CLI while it does not provide keep alive.

3 REPLIES
Super Bronze

Re: VTI vs GRE

If the VTI (virtual tunnel interface) you're thinking of is the one used by IPSec, it would seem to have more overhead and more configuation than just GRE. Or where you thinking VTI vs. IPSec/GRE tunnel?

New Member

Re: VTI vs GRE

Yes, you are right. GRE over IPsec. Thanks for correcting me.

New Member

Re: VTI vs GRE

Hi,

GRE headers  adds extra 4 bytes, thus reducing the bandwidth for sending encrypted data.

See attachment.

And info from  http://www.nil.com/ipcorner/IPsecVPN3/

"The main difference is that VTIs only support IP (unicast and multicast), while GRE also supports other protocols. VTIs also were not available on all platforms when they were first introduced."

Kind regards,

Michal

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