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Use Case and Reference Architecture

The DCI JVDE is an extension design document that covers multiple data center designs (using Juniper switches) and interconnects them. The data center designs that will be included are 3-Stage, Collapsed Fabric and 5-Stage Data Center design.

There are several ways Data Center Interconnect (DCI) can be achieved but this JVDE focuses on some key designs. The key focus of these uses cases is on the DCI solution and configuration of below DCI methods between data centers using recommended Juniper Border leaf switches.

Over-the-Top (OTT) (with MACSEC)

In the over-the-top Interconnect design, the two data centers as shown below in Figure 1 are connected using a layer 2 switch and forms a layer 2 stretch for the tenants provisioned with VPN routing and forwarding (VRF). The VXLAN/VNI tunnels are formed between all the Leaf devices in both data centers and the Layer 2 switches are merely switching packets between data center. In the OTT design, tunnels are formed across all leaf devices spanning the two data centers and can increase depending on the VXLAN/VNIs and the tenants. Hence this solution is better suited for smaller data centers that are not prone to change.

Figure 1: Over-the-top Interconnect Design Over-the-top Interconnect Design

EVPN-VXLAN Type 2 Seamless Stitching (with MACSEC)

In contrast to the OTT design, the Layer 2 Seamless stitching design tunnels are not formed across all leaf devices in both data centers and hence only a subset of VLAN/VNI stretching between sites can be enabled in a selective manner. The local VLAN/VXLAN tunnels also get terminated at the border leaf switches, as is depicted below in Figure 2 and new DCI VXLAN tunnels are formed between the data centers. Due to this, VXLAN tunnels are not formed automatically each time a new leaf switch is added (as is the case with OTT). This increases the scale performance and simplifies the configurations needed to achieve the Layer 2 extensions.

In this design QFX5700 and QFX5120-48YM is used so as to facilitate MACSEC functionality between the two data centers.

In the below Figure 2, one of the data center design is collapsed fabric data center.

Figure 2: EVPN-VXLAN Type 2 Seamless Stitching A diagram of a computer network AI-generated content may be incorrect.

EVPN-VXLAN (Type 2 and Type 5) Seamless Stitching

The VXLAN-to-VXLAN Type 5 stitching is merely an extension of the Type 2 Seamless Stitching. As discussed above, the Layer 3 context is stretched across the data centers. For this design option, as an example the 3-stage and 5-stage data centers are used to form this DCI design.

Figure 3: VXLAN (T5) to VXLAN (T5) design with Layer 2 VLAN/VNI Stretch A diagram of a computer server AI-generated content may be incorrect.