Layer 2 vs. Layer 3 generic routing encapsulation (GRE)
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NetworkingATE
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Layer 2 vs. Layer 3 generic routing encapsulation (GRE)
Networking, Layer 2, Layer 3, GRE, OSI, Routing, Routing and switching, Routers
What is the difference between Layer 2 GRE and Layer 3 GRE?
ASKED: Jun 17 2009  8:49 PM GMT
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Poisoncidr
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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 Answered: Jun 22 2009  6:56 AM GMT by Poisoncidr   20 pts.
Latest Contributors: Sudhanshu   750 pts.
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Troy Tate   0 pts.  |   Jun 22 2009  7:48PM GMT

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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