SONiC Open Networking Software for Enterprise Data Center


  • EVPN Multi-Homing

    The intended audience for this white paper is familiar with networking terms and may refer to the “Network Definitions White Paper” for additional information. Next, one may also read the companion white papers titled “BGP EVPN VXLAN” and “Multi Chassis Link Aggregation with Active-Standby”. All the aforementioned documents are part of the meta paper, “BGP-EVPN-VXLAN-MC-LAG White Paper”. Ethernet Virtual Private Network (EVPN) has the following homing modes for connection between Provider Edge (PE) and Customer Edge (CE) devices:
  • Network Definitions

    VLAN – Virtual Local Area Network is a technique of isolating LANs based on the 802.1Q standard with a 16-bit protocol identifier tag and a 16-bit control information tag, which is broken further into a 12-bit VLAN identifier, 3-bit 802.1p-based priority code point, and 1-bit 802.1Q-based drop eligible indicator (indicating congestion). Leaf-and-Spine Network – It is a two-tiered tree-like structure, as shown in the Figure 2, with a leaf layer and a spine layer. One can think of the access and south-bound aggregation layers merging to become the leaf layer and the core and north-bound aggregation layers merging to become the spine layer. This is how a Data Center (DC) Network looks.

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