Unable to set service interface on T-1 gateway

Products

• VMware NSX

Issue/Introduction

Multiple T-1 gateways are configured with same edge cluster

Service interface is being configured on 2 of these T-1 gateways connecting to 2 segments with same vLAN id. 

First T-1 gateway service interface is in Success state while, below error is observed when connecting the service interface of the second T-1 gateway to the same vLAN id segment.

Oct 1. 2015: module name=ROlJTING.[Logical-Switch-vlan100) of LogicaLswitch/UUID ] overlapping with [Logical-switch-vlan of Logicalswitch/UUID] in same underlying Edge host-switch is not allowed. Change vlan configuration.'] [Routing] [Logical-Switch-vlan (312) of Logicalswitch,'UUID) overlapping with [Logical-Switch-vlan of Logicalswitch,'UUID] in same underlying Edge host-switch is not allowed l Change vlan configuration 

Environment

VMware NSX 

Cause

• This is an expected behavior.
• Same vlan id cannot be configured on 2 different T-1 gateways attached with same Edge node cluster.

Resolution

• Fix the overlapping configuration.
                        OR 
• Configure the second T-1 gateway with a different edge cluster.