Setting Up a Secure GRE or DVMRP Connection Between E Series Routers

In Figure 29, a secure GRE/IPsec connection is set up between two E Series routers.

To set up a secure connection:

  1. Set up the IPsec connection between the two routers. IKE signals a security association (SA) between the two IPsec tunnel endpoints.

    Two unidirectional SAs are established to secure data traffic.

  2. Set up a GRE tunnel between the two routers.

The GRE tunnel now runs over the SAs that IKE established.

Figure 29: GRE/IPsec Connection

GRE/IPsec Connection

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