Add an Uplink Port for the Second Edge Node for ECMP in Manager Mode

Before you enable ECMP, you must configure an uplink to connect the tier-0 logical router to the VLAN logical switch.

Prerequisites

• Verify that a transport zone and two transport nodes are configured. See the NSX-T Data Center Installation Guide.
• Verify that two Edge nodes and an Edge cluster are configured. See the NSX-T Data Center Installation Guide.
• Verify that a VLAN logical switch for uplink is available. See Create a VLAN Logical Switch for the NSX Edge Uplink in Manager Mode.
• Verify that a tier-0 logical router is configured. See Create a Tier-0 Logical Router in Manager Mode.

• Verify that Manager mode is selected in the NSX Manager user interface. See NSX Manager. If you do not see the Policy and Manager mode buttons, see Configure the User Interface Settings.

Procedure

1. With admin privileges, log in to NSX Manager.
2. Select Networking > Tier-0 Logical Routers.
3. Select the tier-0 logical router.
4. Click the Configuration tab to add a router port.
5. Click Add.
6. Complete the router port details.

   Option	Description
   Name	Assign a name for the router port.
   Description	Provide additional description that shows that the port is for ECMP configuration.
   Type	Accept the default type Uplink.
   MTU	If you leave this field empty, the default is 1500.
   Transport Node	Assign the Edge transport node from the drop-down menu.
   URPF Mode	uRPF (unicast Reverse Path Forwarding) is enabled by default on external, internal and service interfaces. From a security standpoint, it is a best practice to keep uRPF enabled on these interfaces. uRPF is also recommended in architectures that leverage ECMP. It is possible to disable uRPF in complex routing architectures where asymmetric routing exists.
   Logical Switch	Assign the VLAN logical switch from the drop-down menu.
   Logical Switch Port	Assign a new switch port name. You can also use an existing switch port.
   IP Address/Mask	Enter an IP address that is in the same subnet as the connected port on the ToR switch.

7. Click Save.

Results

A new uplink port is added to the tier-0 router and the VLAN logical switch. The tier-0 logical router is configured on both of the edge nodes.

What to do next

Create a BGP connection for the second neighbor and enable the ECMP routing. See Add a Second BGP Neighbor and Enable ECMP Routing in Manager Mode.