There are no specific constraints to configure bridging on a bare metal edge. However, if you are planning to run a bridge on an NSX Edge VM, use this section to understand the specific configuration to perform in the vSphere infrastructure.
As you can see on the diagram, the VLAN uplink of the bridge is linked to port p, which is attached to distributed portgroup dvpg1. This port p is injecting into dvpg1 traffic with the source mac addresses mac1 and mac2 of virtual machined VM1 and VM2. Port p must also accept traffic with destination mac addresses mac1 and mac2, so that the physical host can reach VM1 and VM2. When a bridge is running on the edge VM, the port of this edge VM behaves in a non-standard way as far as the vSphere switching infrastructure is concerned. That means that dvpg1 will need some additional configuration to accommodate the edge VM. The following section lists the different options based on your environment.
Option 1: Edge VM is on a VSS portgroup
This option is for when the Edge VM is connected to a VSS (vSphere Standard Switch). You must enable promiscuous mode and forged transmit.
- Set promiscuous mode on the portgroup.
- Allow forged transmit on the portgroup.
- Run the following command to enable reverse filter on the ESXi host where the Edge VM is running:
esxcli system settings advanced set -o /Net/ReversePathFwdCheckPromisc -i 1
Then disable and enable promiscuous mode on the portgroup with the following steps:- Edit the portgroup's settings.
- Disable promiscuous mode and save the settings.
- Edit the portgroup's settings again.
- Enable promiscuous mode and save the settings.
- Do not have other port groups in promiscuous mode on the same host sharing the same set of VLANs.
- Avoid running other VMs attached to the portgroup in promiscuous mode on the same host, as the traffic gets replicated to all those VMs and affect performance.
Option 2a: Edge VM is on a VDS 6.6.0 (or later) portgroup
This option is for when the Edge VM is connected to a VDS (vSphere Distributed Switch). You must be running ESXi 6.7 or later, and VDS 6.6.0 or later.
- Enable MAC learning with the option “allow unicast flooding” on the distributed portgroup.
Starting with vSphere 8.0, you can enable the Mac Learning UI option in the distributed portgroup configuration. For previous releases, you need to use the VIM API DVSMacLearningPolicy and setting allowUnicastFlooding to
true
.
Option 2b: Edge VM is on a VDS 6.5.0 (or earlier) portgroup
This option is for when the Edge VM is connected to a VDS (vSphere Distributed Switch). You enable promiscuous mode and forged transmit.
- Set promiscuous mode on the distributed portgroup.
- Allow forged transmit on the distributed portgroup.
- Run the following command to enable reverse filter on the ESXi host where the Edge VM is running:
esxcli system settings advanced set -o /Net/ReversePathFwdCheckPromisc -i 1
Then disable and enable promiscuous mode on the distributed portgroup with the following steps:- Edit the distributed portgroup's settings.
- Disable promiscuous mode and save the settings.
- Edit the distributed portgroup's settings again.
- Enable promiscuous mode and save the settings.
- Do not have other distributed port groups in promiscuous mode on the same host sharing the same set of VLANs.
- Avoid running other VMs attached to the distributed portgroup in promiscuous mode on the same host, as the traffic gets replicated to all those VMs and affects performance.
Option 3: Edge VM is connected to an NSX segment
If the Edge is deployed on a host with NSX installed, it can connect to a VLAN segment and use MAC Learning, which is the preferred configuration option.
- Create a new MAC Discovery segment profile by navigating to
- Click .
- Enable MAC Learning. This will also enable Unknown Unicast Flooding. Keep the flooding option enabled for bridging to work in all scenarios.
- Click Save.
.
- Edit the segment used by the Edge by navigating to
- Click the menu icon (3 dots) and select Edit.
- Expand the Segment Profiles section, then set the MAC Discovery profile to the one created above.
.