[ovs-discuss] More than one mirror port on an ovs bridge

Ben Pfaff blp at ovn.org
Wed Feb 10 18:23:27 UTC 2016


On Wed, Feb 10, 2016 at 02:37:54PM +0100, Daniel Spiekermann wrote:
> I have a short question regarding to the mirror ports. Is ist possible to install more than one mirror on an ovs bridge?
> I have a system which hosts 5 vm, all of these vms are connected to br1. The interfaces are tap{1…5},
> When I configure a mirror port (lets say tap4) to capture all traffic of tap1, I use this command:
> 
> ovs-vsctl -- set Bridge br1 mirrors=@m \
>  -- --id=@src get Port tap1 \
>  -- --id=@mir get Port tap4 \
>  -- --id=@m create Mirror name=ovs_mirror select-dst-port=@src select-src-port=@src output-port=@mir
> 
> The mirror is created successfully.
> 
> After that I try to create a second mirror on br1 with the same command, only changed tap1 to tap2 and tap4 to tap3 and the mirror-name. This mirror is created, too, but after that I miss my first mirror.
> 
> The created uuid of the mirror is different to the first one, so I think ovs isn’t able to handle more than one mirror port on a bridge at the same time?

If you use commands similar to the above twice, the first mirror will be
deleted because you set "mirrors" to just the second mirror.  If you
want to add a mirror instead of setting all the mirrors, use:
        add Bridge br1 mirrors @m
instead.



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