[ovs-discuss] Flooding of packets destined to OVS port's mac address

[Pujar, Shyam (Nokia - IN/Bangalore)]

Hi,
                MAC addresses mentioned in the diagram are just for example.
MAC addresses used were as follows:

Client Program:
52:54:00:00:01:02

Server Program:
52:56:11:80:80:41

TAP1:
52:F3:12:E4:6D:A9

TAP2:
72:17:32:32:15:F8

Regards,
Shyam

From: ext Gurucharan Shetty [mailto:shettyg at nicira.com]
Sent: Thursday, July 16, 2015 11:48 PM
To: Pujar, Shyam (Nokia - IN/Bangalore)
Cc: bugs at openvswitch.org
Subject: Re: [ovs-discuss] Flooding of packets destined to OVS port's mac address

I don't know the answer, but some of your mac addresses have multi-cast bit enabled. So I wonder whether that is the problem.

On Wed, Jul 15, 2015 at 12:18 PM, Pujar, Shyam (Nokia - IN/Bangalore) <shyam.pujar at nokia.com<mailto:shyam.pujar at nokia.com>> wrote:
Hi ,
        Please find setup and testing procedure below.

[cid:image001.jpg at 01D0C08E.397321C0]

1.       In the above setup, Client Program tries to send packet with src_mac: 3:3:3:3:3:3  and dst_mac: 1:1:1:1:1:1.
2.       Packet is flood to port tap2.
3.       Why does OVS flood packets when dst_mac received is its own port’s mac address.
4.       As it forwards to other ports, there is no one to reply for dst_mac other than OVS bridge itself.
5.       Where as in case of Linux bridge, packet is not flooded to other ports. Instead packet is dropped.

Could you please tell me how do switches in real work? As per my understanding there should be static entries in forwarding table of switch for its own mac addresses.
And default action should be present for it.


Regards,
Shyam


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