Hi Jimmy, >From what I've seen, libvirtd adds a virbr0 bridge, cloud0 is added when the >host is configured in the ACS ui. And under this bridge all the virtual >interfaces are created, so it is in use. I have only one bridge per host, with (now) only one ethernet interface under it. That bridge is set as traffic label in ACS on all traffic types (management, public, etc.). That's all to it, nothing fancy. You guys may be right about the switch ports, in fact this was my next step, to get it out of the equation and see if everything works as it should.
-----Original Message----- From: Jimmy Huybrechts <[email protected]> Sent: Wednesday, July 24, 2024 4:07 PM To: [email protected] Subject: Re: No network if VR and VM are on different hosts Hi, Cloud0 is added here too, in a down state (it's normal as I don't use them and it's auto added by libvirtd) What are the bridges defined inside Cloudstack? It very much sounds like an issue on the switch side as Wei mentioned as well. -- Jimmy From: Alexandru Stan <[email protected]> Date: Wednesday, 24 July 2024 at 14:47 To: [email protected] <[email protected]> Subject: RE: No network if VR and VM are on different hosts Hi Wei, They were. I even tried with plain, access ports, and only one interface on the host bridge, it's the same issue, the cloud0 bridge does not come up, it's either down or unknown. I really don't know where to go from here, never had this issue while testing and I did like 1000 installations on identical hardware, same host os. The only difference that I can think of is the ACS version, in testing I used 4.19.0 and now 4.19.1, but I don't think this is relevant since it doesn't seem like other users experienced this issue. Alex -----Original Message----- From: Wei ZHOU <[email protected]> Sent: Wednesday, July 24, 2024 1:27 AM To: [email protected] Subject: Re: No network if VR and VM are on different hosts Hi, This seems to be a very typical issue for cloud platforms. The switch ports need to be configured as trunk mode. -Wei On Tuesday, July 23, 2024, Alexandru Stan <[email protected]> wrote: > Hello. I am dealing with a weird networking issue that I never > experienced before and I really can't find anything relevant in logs > or else. The setup is like this: > > * Kvm hosts with 2 slave interfaces (for redundancy) under a master > bridge called br0 > * The 2 interfaces are connected to 2 stacked Cisco switches > * Traffic for management, guest, public, etc. goes through this bridge > only > * ACS zone added with advanced network, br0 label set on each traffic > type > > Everything seems fine, the system vms are up & running, hosts are > added without issues, etc. The cloud0 bridge is created on each host > as it should. Now, if I add a vm on a certain host and the virtual > router (simple, isolated network) is on the same host, everything > works fine, the vm gets its own ip, dns, internet conectivity, etc. > But if I add a vm to a different host than where the VR is hosted, I > don't get any network for the vm. The virtual interfaces are created > on the host but the cloud0 bridge status is either down or unknown. > Could this be related to the hardware setup or it's something ACS related? > > Thank you! >
