Comment 4 for bug 1535069

wasup

On Thu, Jul 27, 2017 at 10:09 AM, Omer Anson <email address hidden>
wrote:

> This is an RFE. That's why it's moved to Wishlist. It's not to say it's
> not important, but RFEs should be either Wishlist or High, and the core
> team doesn't have the resources to make it high.
>
> ** Changed in: dragonflow
> Importance: Medium => Wishlist
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1535069
>
> Title:
> Problematic multicast packet handling
>
> Status in DragonFlow:
> New
>
> Bug description:
> Hello
>
> It turned out we have a problem with multicast packet handling.
>
> When VM sends a multicast packet, default OVN rules send this packet to
> all other VMs
> in the same network including the original VM.
>
> Lets take the following rule in table 17:
> {'cookie': u'0x0,', 'table': u'17,', 'match':
> u'metadata=0x2,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00', 'priority':
> u'200', 'actions': u'set_field:0x5->reg7,resubmit(,64),set_field:0x97->
> reg7,resubmit(,64),set_field:0x3->reg7,resubmit(,64)}
>
> After adding new VM (port_id=51, tunnel_id=0xbb) we got the following
> rule:
> {'cookie': u'0x0,', 'table': u'17,', 'match':
> u'metadata=0x2,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00', 'priority':
> u'200', 'actions': u'set_field:0x5->reg7,resubmit(,64),set_field:0x97->
> reg7,resubmit(,64),set_field:0x3->reg7,resubmit(,64),set_
> field:0xbb->reg7,resubmit(,64)'}
>
> "set_field:0xbb->reg7,resubmit(,64)" is appended to the rule.
>
>
> Potential solution:
> -------------------------
>
> As I understand we want to keep number of OVN rules at minimal.
>
> I can suggest to drop a new copy of the packet before sending it to
> the target VM (same as original VM).
>
> We can simply drop multicast packet when "reg6=reg7" and
> "dl_dst=01:00:00:00:00:00/01:00:00:00:00:00" and add this rule as
> first rule at table 64.
>
>
> Best regards,
> Yuli
>
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>