Configure BGP in the Tier-0 Gateway for Availability Zone 2

To enable fail-over from availability zone 1 to availability zone 2, you configure BGP neighbors on the tier-0 gateway in the management or workload domain to be stretched. You add route filters to configure localpref on incoming traffic and prepend of AS on outgoing traffic.

You configure two BGP neighbors with route filters for the uplink interfaces in availability zone 2.

Table 1. BGP Neighbors for Availability Zone 2

Setting	BGP Neighbor 1	BGP Neighbor 2
IP address	ip_bgp_neighbor1	ip_bgp_neighbor2
BFD	Deactivated	Deactivated
Remote AS	asn_bgp_neighbor1	asn_bgp_neighbor2
Hold downtime	12	12
Keep alive time	4	4
Password	bgp_password	bgp_password

Table 2. Route Filters for BGP Neighbors for Availability Zone 2

Setting	BGP Neighbor 1	BGP Neighbor 2
IP Address Family	IPV4	IPV4
Activated	Activated	Activated
Out Filter	rm-out-az2	rm-out-az2
In Filter	rm-in-az2	rm-in-az2
Maximum Routes	-	-

Procedure

1. On the NSX Manager main navigation bar, click Networking.
2. In the navigation pane, click Tier-0 gateways.
3. Select the gateway and from the ellipsis menu, click Edit.
4. Add the uplink interfaces to the NSX Edge nodes.
   1. Expand BGP and in the BGP neighbors section, click 2.
   2. In the Set BGP neighbors dialog box, click Add BGP neighbor and configure the following settings.

      Setting	Value
      IP address	ip_bgp_neighbor1
      BFD	Deactivated Note: Activate BFD only if the network supports and is configured for BFD.
      Remote AS	asn_bgp_neighbor1
      Source addresses	Select AZ2 interfaces
      Hold downtime	12
      Keep alive time	4
      Password	bgp_password

   3. In the Route filter section, click Set.
   4. In the Set route filter dialog box, click Add route filter and configure the following settings.

      Setting	Value
      IP Address Family	IPV4
      Enabled	Activated
      Out Filter	rm-out-az2
      In Filter	rm-in-az2
      Maximum Routes	-

   5. Click Add and then click Apply.
5. Repeat step 4 to configure BGP neighbor ip_bgp_neighbor2and the corresponding route filter.
6. On the Tier-0 gateway page, click Close editing.