Define a L2 untagged guest network, map to cloudbr1 to access company NFS services

[danivogel90]

Problem
I am trying to create a L2 guest network that is mapped directly to the cloudbr1. The create network command failed with Unable to convert network offering with specified id to network profile.

I can add a VLAN Range to the physical network, then I can do "create network", but the instance will be mapped to a new bridge name/interface.

Can the configuration be created the way I imagine it?

Versions

• CloudStack 4.20.1.0
• Ubuntu 24.04.2

Network

bridge name bridge id       STP enabled interfaces
cloud0      8000.76c30d2f0eda   no      vnet0
                            vnet1
cloudbr0        8000.aa2581097bfd   no      eno3
                            vnet2
                            vnet3
                            vnet4
                            vnet5
cloudbr1        8000.86803b4ff344   no      eno2
cloudbr2        8000.6af97cf2fcad   no      eno1

Configuration with CLI

cmk updateZone id=$ZONE_ID allocationstate=Disabled
cmk create physicalnetwork zoneid=$ZONE_ID name="SVANet" isolationmethods=None
cmk add traffictype physicalnetworkid=$PHNET_ID traffictype=Guest kvmnetworklabel=cloudbr1
cmk update physicalnetwork id=$PHNET_ID state=Enabled
cmk create networkoffering name="L2 No VLAN" guestiptype=L2 supportedservices="" traffictype=Guest specifyvlan=false
cmk update networkoffering id=$NETOFF_ID state=Enabled
cmk create network name="L2 Guest No VLAN" displaytext="L2 Guest SVA" zoneid=$ZONE_ID networkofferingid=$NETOFF_ID physicalnetworkid=$PHNET_ID

Error

Unable to convert network offering with specified id to network profile

2025-07-08 06:27:32,618 WARN  [o.a.c.f.e.EventDistributorImpl] (qtp1404565079-357:[ctx-dc028384, ctx-23a3b627]) (logid:882aabe7) Failed to publish event [category: ActionEvent, type: NETWORK.CREATE] on bus webhookEventBus
2025-07-08 06:27:32,627 ERROR [c.c.a.ApiServer] (qtp1404565079-357:[ctx-dc028384, ctx-23a3b627]) (logid:882aabe7) unhandled exception executing api command: [Ljava.lang.String;@79eec1d4 com.cloud.utils.exception.CloudRuntimeException: Unab
le to convert network offering with specified id to network profile
        at org.apache.cloudstack.engine.orchestration.NetworkOrchestrator.setupNetwork(NetworkOrchestrator.java:832)

[danivogel90]

Other Test

With tags to use more than one untagged guest networks.

With the Web UI its not possible to define isolationmethods=None, the default is an empty string. With the CLI it's possible to define isolationmethods=None.

With None:
Unable to convert network offering with specified id to network profile

With empty:
Unable to allocate vnet as a part of network

The None is the switch to use no VLAN. But it's not possible to get the network ready with the offering. Empty needs to use a VLAN ID and with a VLAN ID, I will have an isolated configuration.

Is it possible tu use a configuration with L2 and isolationmethods=None for a guest network with cloudbr1?

[danivogel90]

I got the solution with:

• Not possible to create L2 guest network without VLAN, mapped to cloudbr1 #11174

Thanks