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Configuration Guide - Reliability

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, EFM Configuration, and CFM Configuration.
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BFD for VXLAN improves network reliability by deploying BFD sessions for VXLAN tunnels. If the primary VXLAN tunnel fails, BFD allows the network to quickly detect this failure and switch traffic to the backup tunnel for subsequent forwarding.


This function is supported for IPv4 over IPv4 and IPv6 over IPv4 networks but not for IPv4 over IPv6 or IPv6 over IPv6 networks.

Usage Scenario

To use BFD to monitor VXLAN tunnel connectivity for VXLAN tunnel protection switching, create a BFD for VXLAN session on a VXLAN gateway.

On the network shown in Figure 2-13, when VXLAN gateways need to communicate with VMware devices, BFD for VXLAN must be deployed. If VMware devices are not deployed, to allow VM3 to forward unicast service traffic to VM1 and VM2, Device3 directly forwards the traffic to Device1 connected to VM1 and to Device2 connected to VM2. For BUM traffic, Device3 uses an ingress replication list to replicate traffic and sends one copy to Device1 and Device2. If there is a great number of VMs, ingress replication wastes a lot of resources. To reduce the network pressure, VMware uses replicators to centrally replicate BUM traffic. Each VTEP encapsulates BUM packets to the replicator VXLAN tunnel and sends BUM packets only to the replicator. The replicator then sends BUM packets to other VTEPs except for the source VTEPs. To improve network reliability, multiple replicators can be deployed in a cluster.

Figure 2-13 BFD for VXLAN


Figure 2-14 shows the format of a BFD for VXLAN packet.

Figure 2-14 Format of a BFD for VXLAN packet
On a network with BFD for VXLAN deployed, packets are forwarded as follows:
  • Each VTEP establishes a VXLAN tunnel with each replicator. These VLXAN tunnels back up each other. BUM packets are forwarded only through one VXLAN tunnel. The replicator that receives BUM traffic replicates the traffic and forwards one copy to other replicators.
  • BFD for VXLAN sessions is deployed between a VXLAN gateway and the replicator cluster to monitor VXLAN tunnel connectivity. If one tunnel fails, traffic is automatically switched to a backup tunnel for forwarding.
The following example assumes that two VXLAN tunnels exist in the VXLAN centralized replication list on Device3 and describes how BFD for VXLAN works.
  1. The destination VTEPs of the two VXLAN tunnels are Replicator1 and Replicator2, respectively. The tunnel between Device3 and Replicator1 is the primary VXLAN tunnel.

  2. Device3 forwards BUM traffic from VM3 to the primary VXLAN tunnel.

  3. BFD for VXLAN monitors the primary VXLAN tunnel.

  4. If the primary tunnel fails, Device3 detects this failure through BFD and quickly switches traffic to its backup VXLAN tunnel between Device3 and Replicator2, ensuring reliable traffic forwarding.

Updated: 2019-04-03

Document ID: EDOC1100075366

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