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Configuring the GRE Tunnel Interface on the PE Router

You configure the GRE tunnel as a logical interface on the PE router. To configure the GRE tunnel interface, include the unit statement:



unit logical-unit-number {


tunnel {
source source-address;
destination destination-address;


routing-instance {
destination routing-instance-name;
}


}




family inet {
address address;
}


}

You can include the unit statement at the following hierarchy levels:

[edit interfaces interface-name]
[edit logical-systems logical-system-name interfaces interface-name]

As part of the GRE tunnel interface configuration, you need to include the following statements:

source source-address—Specify the source or origin of the GRE tunnel.
destination destination-address—Specify the destination or end point of the GRE tunnel.

By default, the tunnel destination address is assumed to be in the default Internet routing table, inet.0. If the tunnel destination address is not in inet.0, you need to specify which routing table to search for the tunnel destination address by configuring the routing-instance statement. This is the case if the tunnel encapsulating interface is also configured under the routing instance.

destination routing-instance-name—Specify the name of the routing instance when configuring the GRE tunnel interface on the PE router.

To complete the GRE tunnel interface configuration, include the interface statement for the GRE interface under the appropriate routing instance:



interface interface-name;

You can include the interface statement at the following hierarchy levels:

[edit routing-instances routing-instance-name]
[edit logical-systems logical-system-name routing-instances routing-instance-name]

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