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how to turn on IPsec on a GRE tunnel on cisco

Hi i was talking to the CCIE and he told me that for the GRE tunnel , i need :

1. create the GRE tunnel on both routers ( on each router on each site)  . done
2. create crypto map with the appropriate access list . done
3. Apply the crypto map on both sides . done
4. turn the encryption on. What does he mean .  ?? How do i turn the crypto on ?
Switches / HubsRouters

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Garry Glendown
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Routers
Routers

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

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