On Wed, 09 Nov 2022 19:25:32 +0000 Ali Shirvani <alish...@protonmail.com> wrote:
> Sent with Proton Mail secure email. > > ------- Original Message ------- > On Wednesday, November 9th, 2022 at 8:21 PM, Stephen Hemminger > <step...@networkplumber.org> wrote: > > > > On Wed, 09 Nov 2022 10:51:27 +0000 > > Ali Shirvani via Bridge bridge@lists.linux-foundation.org wrote: > > > > > Hello everyone, > > > > > > It seems we reach the Linux bridge limitation on the number of interfaces > > > in a single bridge. Currently, we have 210 tap interface in a bridge, and > > > we suffer from more than 50% packet loss when we ping the IP address of > > > the virtual machine that uses one of the tap interfaces in the bridge. > > > Do you know how we can connect more than 200 VMs virtual interfaces to a > > > bridge? > > > > > > Best regards, > > > Ali > > > > > > Sent with Proton Mail secure email. > > > > > > The upper limit on interfaces per bridge should be 1023. > > That limitation comes from spanning tree. > > > > You might bet able to improve performance by disabling flooding to those > > tap devices. > > Normally, any broadcast/unknown/multicast must be copied and flooded to > > each interface. > > Thanks a lot for your guidance. I disabled the spanning tree on the bridge > with `brctl stp br0 off` but the issue does not resolve. Would you please > elaborate more about disabling flooding on tap devices, I don't know how I > should disable flooding on tap devices. It is not a spanning tree issue, in fact STP can protect you from bad VM's. It is more about configuring the bridge ports after setup.
