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VPNs
The JUNOS software supports several types of VPNs:
- Layer 2 VPNs—A Layer 2 VPN links a set of sites
sharing common routing information, and whose connectivity is controlled
by a collection of policies. A Layer 2 VPN is not aware of routes
within a customer’s network. It simply provides private links
between a customer’s sites over the service provider’s
existing public Internet backbone.
- Layer 3 VPNs—A Layer 3 VPN links a set of sites
that share common routing information, and whose connectivity is controlled
by a collection of policies. A Layer 3 VPN is aware of routes within
a customer’s network, requiring more configuration on the part
of the service provider than a Layer 2 VPN. The sites that make up
a Layer 3 VPN are connected over a service provider’s existing
public Internet backbone.
- Interprovider VPNs—An interprovider VPN supplies
connectivity between two VPNs in separate autonomous systems (ASs).
This functionality could be used by a VPN customer with connections
to several various ISPs, or different connections to the same ISP
in various geographic regions.
- Carrier-of-Carrier VPNs—Carrier-of-carrier VPNs
allow a VPN service provider to supply VPN service to a customer who
is also a service provider. The latter service provider supplies Internet
or VPN service to an end customer.
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