It is possible for two Edges to be set up in a High Availability scheme. The Active SD-WAN Edge will share BGP routes over the HA link. When Enhanced HA is used, BGP on the Active Edge makes a neighbor relationship with a peer that is only linked to the WAN link of the standby Edge.
Beginning with Release 5.1.0 and continuing onwards, a site that is deployed in High Availability and has BGP configured will automatically synchronize local routes between the Active Edge and the Standby Edge. This site will then use these routes for forwarding on the Active Edge, while also ensuring that the route table is immediately available following a HA failover. Due to the fact that the routes are already available on the Standby Edge when it is promoted to Active, this results in improved failover times after the promotion.
We highly recommend activating the BGP Graceful Restart functionality in order to optimize HA failovers in Standard and Enhanced HA topologies when BGP is being used.
High Availability a Smooth Transition with BGP Graceful Restart
An HA failover can be slow and cause problems for customer traffic on a site that is set up in a High Availability topology that also uses BGP. This is because the peer Edges delete all the routes during a failover. VMware adds the BGP Graceful Restart tool to HA deployments in Release 5.1.0 and later. This makes sure that HA failovers happen faster and with a lesser disruption.
Setting Up BGP Graceful Restart
You have to execute part one in the BGP configuration section and part two in the High Availability configuration section to configure BGP Graceful Restart. First, you must:
- Turn on Graceful BGP Restart by going to Configure > Device > BGP.
- Click either Configure > Profile or > Configure > Edges in the Customer portal, based on what you want to do. The steps for a single HA Edge will be displayed in the screenshots.
- Select the Device tab after clicking the Device icon next to an Edge or by clicking the Edge’s link.
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