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What do I choose layer2 or layer3 WAN?

Hi,

I've got a choice of getting a new WAN connection but I don't fully understand the reasons for choosing a layer2 wan over a layer3 wan, can someone please explain the advantages/disadvantages of each and when to use either?

Thanks in advance,

Dan

1 ACCEPTED SOLUTION

Accepted Solutions

Re: What do I choose layer2 or layer3 WAN?

Hi,

A L2 WAN means the entire WAN is just a medium with no routing involved. In other words, both endpoints on both ends of the WAN belong to the same IP subnet.

So, a L2 WAN could be seen as that you have the other end device (on the other end of the WAN) as directly connected (logically at L3).

Examples of L2 WAN could be ATM, Frame-Relay, PPP, leased-lined, etc.

A L3 WAN means that there's routing involved in the WAN itself. This means your next-hop will be your WAN device and not the other end of the WAN.

Both ends of the WAN are in different IP subnets.

Examples of L3 WAN could be MPLS L3 VPN.

Hope it helps.

Federico.

2 REPLIES

Re: What do I choose layer2 or layer3 WAN?

Hi,

A L2 WAN means the entire WAN is just a medium with no routing involved. In other words, both endpoints on both ends of the WAN belong to the same IP subnet.

So, a L2 WAN could be seen as that you have the other end device (on the other end of the WAN) as directly connected (logically at L3).

Examples of L2 WAN could be ATM, Frame-Relay, PPP, leased-lined, etc.

A L3 WAN means that there's routing involved in the WAN itself. This means your next-hop will be your WAN device and not the other end of the WAN.

Both ends of the WAN are in different IP subnets.

Examples of L3 WAN could be MPLS L3 VPN.

Hope it helps.

Federico.

New Member

Re: What do I choose layer2 or layer3 WAN?

Many thanks for that. It actually makes things a lot clearer now.

Thanks

Dan

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