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NetworkingATE
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 Layer 2 vs. Layer 3 generic routing encapsulation (GRE)
GRE, Layer 2, Layer 3, Networking, OSI, Routers, Routing, Routing and switching
What is the difference between Layer 2 GRE and Layer 3 GRE?

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ASKED: June 17, 2009  8:49 PM
UPDATED: June 22, 2009  7:48 PM
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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.
Last Wiki Answer Submitted:  June 22, 2009  6:56 am  by  Sudhanshu   810 pts.
All Answer Wiki Contributors:  Sudhanshu   810 pts.
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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.

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Troy Tate
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