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Configuration Guide - Network Management and Monitoring

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of Network Management and Monitoring, including SNMP, RMON, NETCONF, OpenFlow, LLDP, NQA, Mirroring, Packet Capture, Packet Trace, Path and Connectivity Detection Configuration, NetStream, sFlow, and iPCA.
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Application Scenarios for OVSDB

Application Scenarios for OVSDB

Figure 6-6 shows the overlay network consisting of the VMware NSX controller and the CE switch based on virtual extensible LAN (VXLAN). This network is used in cloud computing and virtualization data centers.

Figure 6-6 VXLAN-based overlay network

VXLAN Layer 2 Gateway

On the VMware vSphere platform for cloud computing, users can dynamically deploy VMs on the ESXi server based on demands and also dynamically deploy an overlay network based on VM deployment.

For bare metal servers and physical devices such as firewalls and load balancers that cannot be virtualized, they can be connected through the CE switch to the overlay network deployed by the VMware NSX controller. After the VMware NSX controller establishes an open vSwitch database (OVSDB) connection with a leaf device, this controller delivers VXLAN configurations to the leaf device, making the leaf device a Layer 2 VXLAN gateway. In this way, the leaf device serving as a virtual tunnel end point (VTEP) can establish a VXLAN tunnel with the NSX OVS and connect bare metal servers, firewalls, and load balancers to the overlay network deployed by the VMware NSX controller. The leaf device and the NSX OVS can synchronize MAC information through the VMware NSX controller so that the VM in server 1 can communicate with the bare metal server.


The VMware NSX controller uses the replicator to implement centralized replication of BUM packets. Centralized replication indicates that each VTEP encapsulates BUM packets into the replicator tunnel and sends them to the replicator only. Then, the replicator sends these packets to VTEPs except the source VTEP. To improve network reliability, the replicator supports cluster deployment. A cluster consists of multiple replicators.

To ensure a reliable link between the leaf device and the replicator, the VMware NSX controller delivers bidirectional forwarding detection (BFD) for VXLAN to the leaf device. A BFD check mechanism is used to check the connectivity of the VXLAN tunnel between the leaf device and the replicator. When the replicator is faulty, the VXLAN gateway can identify the fault rapidly and switch traffic to another normal replicator, avoiding traffic loss due to slow fault perception.

Updated: 2019-04-20

Document ID: EDOC1100075365

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