Layer 2 vs. Layer 3 generic routing encapsulation (GRE)

1545 pts.
Tags:
GRE
Layer 2
Layer 3 switches
Networking
OSI
Routers
Routing
Routing and switching
What is the difference between Layer 2 GRE and Layer 3 GRE?

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It is basically the end-point of tunnels. If you have tunnel interfaces with an IP address, a Layer 3 generic routing encapsulation (GRE) tunnel, or if you assign a MAC address or Digital Subscriber Line Access Multiplier (DSLAM) address, etc., to the tunnel — it becomes a Layer 2 tunnel.
Hope it helps.

Layer 3 goes throught routers, layer 2 is confined to switches.

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  • NetworkingATE
    Layer 2 uses hardware or MAC addresses. Layer 3 uses a different addressing scheme whether it is IP or another addressing standard. IP is probably most prevalent but layer 3 addressing is not limited to just IP addresses. IPX is a combination of both layer3 and layer4 (socket) addressing. In the IT trenches? So am I - read my IT-Trenches blog
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