Deploying Juniper Data Centers with EVPN VXLAN (for True Epub) by Aninda Chatterjee

Author:Aninda Chatterjee
Language: eng
Format: epub
Publisher: Addison-Wesley
Published: 2024-04-15T00:00:00+00:00

Figure 7-1 Router-on-a-stick design

With Layer 3–capable switches, along with Layer 2 functionality, routed interfaces can be created for corresponding VLANs as well, also called IRB interfaces (or switch virtual interfaces [SVIs] in the case of vendors such as Cisco Systems). With this new IRB construct, both routing and bridging can occur on the same device, without having an additional Layer 3 device dedicated for this. The same concept of IRBs is now extended to VXLAN and VNIs as well. MAC-VRFs, introduced and explored in Chapter 6, provide Layer 2 connectivity for hosts, while IRB interfaces provide Layer 3 connectivity.

Thus, with IRB interfaces on Layer 3–capable switches, Figure 7-1 can be re-drawn as shown in Figure 7-2, with the routing functionality being moved into the switch itself, visually represented with the router moved inside the switch.

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