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GRE Tunnel

September 8th, 2015 in ROUTE 300-101 Go to comments

Question 1

Explanation

GRE packets are encapsulated within IP and use IP protocol type 47

Question 2

Explanation

A GRE interface definition includes:

+ An IPv4 address on the tunnel
+ A tunnel source
+ A tunnel destination

Below is an example of how to configure a basic GRE tunnel:

interface Tunnel 0
ip address 10.10.10.1 255.255.255.0
tunnel source fa0/0
tunnel destination 172.16.0.2

In this case the “IPv4 address on the tunnel” is 10.10.10.1/24 and “sourced the tunnel from an Ethernet interface” is the command “tunnel source fa0/0”. Therefore it only needs a tunnel destination, which is 172.16.0.2.

Note: A multiple GRE (mGRE) interface does not require a tunnel destination address.

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