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L2TP vs GRE

satpot1981
Level 1
Level 1

ā€Ž07-27-2012 05:55 AM - edited ā€Ž03-04-2019 05:05 PM

Hi all,

Can anyone clearly explain that what is the difference between L2TP and GRE tunnel?

I am  trying to understand where these protocol are used and why we use L2TP instead of GRE in some cases and vice versa.

Thanks

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smehrnia
Level 7
Level 7

ā€Ž07-27-2012 07:42 AM

Hi Murat

GRE is a simple IP packet encapsulation protocol. a GRE tunnel is used when packets need to be sent from one network to another, without being parsed or treated like IP packets by any intervening routers. a GRE tunnel interface comes up as soon as it is configured and it stays up as long as there is a valid tunnel source address or interface which is up.

L2TP is a tunneling protocol (used to support VPNs) that allows multiplexing of multiple PPP sessions between two IP-connected endpoints, and a control protocol for dynamically establishing and maintaining the emulation of these PPP sessions. This is very different than GRE.

Hope it Helps,

Soroush.

Hope it Helps!

Soroush.

aain
Level 1
Level 1

ā€Ž04-26-2022 08:29 AM

has anyone configured L2TP on cisco 9K nexus

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