H3C Technologies H3C S12500-X Series Switches - Manual (Page 9)

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Figure 3 Multiple EVI networks
Terminology
Edge device
An edge device performs typical Layer 2 learning and forwarding on the site-facing interfaces (internal
interfaces) and performs tunneling and routing on the transport-facing interfaces.
EVI network ID
An edge device can belong to multiple EVI networks. Each EVI network is uniquely identified by a
network ID.
EVI link
An EVI link is a bidirectional virtual Ethernet channel between a pair of edge devices in an EVI network.
EVI links are conveyed on EVI tunnels. Each EVI link is uniquely identified by a pair of source and
destination EVI tunnel IP addresses.
EVI tunnel
An EVI tunnel is a point-to-many automatic GRE tunnel that conveys EVI links for an EVI network. One EVI
tunnel can provide services only for one EVI network.
EVI neighbor
All edge devices in an EVI network are EVI neighbors to one other.
ENDP
EVI Neighbor Discovery Protocol uses the client/server model to dynamically discover sites and edge
devices, establish and maintain EVI links, and exchange network membership information in an EVI
network.
ENDS
An EVI neighbor discovery server maintains all neighbor information in an EVI network. An EVI network
can have up to two ENDSs.
Site 1
Site 2
Site 4 Site 5
EVI 1
VLANs 100-101
EVI 2
VLAN 4000
EVI 3
VLANs 50-80
Site 3