Ability to use vLAN tag on other bridge than already configured bridge

[William Edwards]

Situation: I have five bridges. Each bridge is used for a different vLAN. The vLAN is specified on the bridge ports. I want to replace these vLAN-specific bridges by one bridge, where I will set the vLAN tag on VM NICs instead of the bridge itself.

Problem: to prevent downtime, I will update each VM NIC to use the new bridge, and configure the vLAN in the NIC settings. However, I can't, due to this error:

Parameter verification failed. (400) net0: hotplug problem - interface eno2.243 already exist in bridge vmbr172

In this case, I am attempting to replace vmbr172 (old bridge, with bridge port eno2.243) by vmbr999 with tag 243. As you can see, Proxmox is preventing that.

Question: I could patch the die() in the source code, but I'm wondering if there is a better way to do what I'm trying to do.

 

[spirit]

you could try with a vlanware bridge with eno2 directly in this bridge.

it should work without conflict.

 

[jlebherz]

this is not working,
you can not assign a vlan through a bridge when the bridged interface (eno2) already has a vlan that is bridged (eno2.243)

you can add an additional physical link with a new bridge and then change the settings of the NICs of your vms

maybe you can post the content of /etc/network/interfaces

 

[William Edwards]

you could try with a vlanware bridge with eno2 directly in this bridge.

it should work without conflict.

Are you saying I wouldn't get this error if I enable 'VLAN aware' on vmbr999?

 

[William Edwards]

you can not assign a vlan through a bridge when the bridged interface (eno2) already has a vlan that is bridged (eno2.243)

I'm not sure what you mean. I am successfully stacking vLANs on top of the bridge's native vLAN.

 

[jlebherz]

for example if you have configured your bridges the following

iface eno2 inet manual

iface eno2.243 inet manual

auto vmbr4
iface vmbr4 inet manual
    bridge_ports eno2
    ....
    
auto vmbr243
iface vmbr243 inet manual
    bridge_ports eno2.243
    .....

you can not assign vmbr4 to a VM and set VLAN Tag to 243, this is not working, xou won't get an error from Proxmox but your Traffic is not passing that vlan

 

[William Edwards]

for example if you have configured your bridges the following

iface eno2 inet manual

iface eno2.243 inet manual

auto vmbr4
iface vmbr4 inet manual
    bridge_ports eno2
    ....
 
auto vmbr243
iface vmbr243 inet manual
    bridge_ports eno2.243
    .....

you can not assign vmbr4 to a VM and set VLAN Tag to 243, this is not working, xou won't get an error from Proxmox but your Traffic is not passing that vlan

I know that is not possible. When I try to do that, I'm getting the error I posted. My question is if there's a good way around that.

 

[jlebherz]

the only option, I know is to use a second physical connection and build the vlans on top of this connection...
another possibility is to use ifupdown2 and remove the vlans of eno2 and after that directly assign the new bridge to the vms.
Dosing so you have a Downtime, yes but only very short because you do not need to reboot the host to get the network changes applied...

 

[William Edwards]

the only option, I know is to use a second physical connection and build the vlans on top of this connection...
another possibility is to use ifupdown2 and remove the vlans of eno2 and after that directly assign the new bridge to the vms.
Dosing so you have a Downtime, yes but only very short because you do not need to reboot the host to get the network changes applied...

I was hoping to avoid that

Thanks.