CE and PE VRFs
To complete the picture, we need to introduce one more piece of terminology. We define the following types of VRFs on the SD-WAN nodes:
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CE VRF is a Customer VRF to which the actual LAN segment is attached. Each LAN-facing interface is assigned to one of the CE VRFs.
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PE VRF is an Edge VRF in which the VRF-Aware Overlays (with
vpn-id-ipipencapsulation) are located. The tunnel interfaces are assigned to the PE VRF.
Thus, in a typical multi-VRF deployment, we will have one PE VRF and multiple CE VRFs.
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The maximum number of VRFs supported by FOS 7.2.4 and later is 252 (from 0 to 251). We put VRF=0 aside. (It is a special case, as will be pointed out below.) In a typical multi-VRF deployment this means 1 PE VRF + up to 250 CE VRFs. |
The following diagram summarizes the above:
Now when we have explained the design, let us list some of the important Planning guidelines.