Configuring Generic Routing Encapsulation Tunneling on ACX Series
Tunneling provides a private, secure path for transporting packets through an otherwise
public network by encapsulating packets inside a transport protocol known as an IP
encapsulation protocol. Generic routing encapsulation (GRE) is an IP encapsulation
protocol that is used to transport packets over a network. Information is sent from one
network to the other through a GRE tunnel.
GRE tunneling is accomplished through routable tunnel endpoints that operate on top
of existing physical and other logical endpoints. GRE tunnels connect one endpoint to
another and provide a clear data path between them.
This topic describes:
1.
Configuring a GRE Tunnel Port on page 584
2.
Configuring Tunnels to Use Generic Routing Encapsulation on page 584
Configuring a GRE Tunnel Port
To configure GRE tunnels on a router, you convert a network port or uplink port on the
router to a GRE tunnel port for tunnel services. Each physical tunnel port, named
gr-fpc/pic/port, can have one or more logical interfaces, each of which is a GRE tunnel.
After conversion to a GRE tunnel port, the physical port cannot be used for network traffic.
To configure a GRE tunnel port on an ACX router, you need to create logical tunnel
interfaces and the bandwidth in gigabits per second to reserve for tunnel services. Include
the tunnel-services bandwidth (1g | 10g) statement at the [edit chassis fpc slot-number
pic number] hierarchy level.
To configure a GRE tunnel port on the ACX5000 line of routers, use any unused physical
port on the router to create a logical tunnel interface as shown below:
user@host# edit chassis
fpc 0 {
pic 0 {
tunnel-services {
port port-number;
}
}
}
This also creates a gr- interface.
Configuring Tunnels to Use Generic Routing Encapsulation
Normally, a GRE tunnel port comes up as soon as it is configured and stays up as long
as a valid tunnel source address exists or an interface is operational. Each logical interface
you configure on the port can be configured as the source or as the endpoint of a GRE
tunnel.
To configure a tunnel port to use GRE:
Copyright © 2017, Juniper Networks, Inc.584
ACX Series Universal Access Router Configuration Guide
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