MPLS in the SDN Era by Antonio Sanchez Monge & Krzysztof Szarkowicz

Author:Antonio Sanchez Monge & Krzysztof Szarkowicz
Language: eng
Format: epub
Publisher: O'Reilly Media, Inc.
Published: 2015-12-21T05:00:00+00:00

Further to the left, it is a classic SP network.

At the bottom of Figure 11-2, notice the User Packet/Frame box. Indeed, it can be an L3 packet or an L2 frame depending on whether the service is EVPN or IP VPN. Thanks to EVPN’s hooks into the L3 world, it is possible to combine EVPN for intrasubnet traffic with IP VPN for intersubnet traffic (this combination is known in OpenContrail as L2_L3 mode). Extending EVPN end-to-end to the subscriber is technically feasible, but it is a bad practice in general to stretch L2 domains.

Although it is not shown in Figure 11-2, OpenContrail also provides communication inside the data center. This makes it possible for VMs running in the same or different vRouters—and for applications running outside OpenContrail—to communicate with one another inside the data center network.

Let’s look at the case study in detail. The focus is on SDN because BGP/MPLS VPNs in physical PEs are already covered in earlier chapters.

For simplicity, Figure 11-3 shows all of the controller functions in the same physical server. Anyway, the focus is on the control node. OpenContrail supports two forwarding modes: pure L3 and mixed L2_L3. The simplest one is pure L3, so let’s begin with it.

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