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* [Bridge] vlan interface egress port
@ 2011-02-02  8:02 Sinbad
  2011-02-02  8:23 ` Nicolas de Pesloüan
  0 siblings, 1 reply; 6+ messages in thread
From: Sinbad @ 2011-02-02  8:02 UTC (permalink / raw)
  To: bridge

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hi,

suppose a vlan has 3 member ports and vlan is configured as an l3 interface
and if data is suppose to go out using that vlan interface, which physical
port
will be chosen among the 3 member ports ?

thanks

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^ permalink raw reply	[flat|nested] 6+ messages in thread
* Re: [Bridge] vlan interface egress port
  2011-02-02  8:02 [Bridge] vlan interface egress port Sinbad
@ 2011-02-02  8:23 ` Nicolas de Pesloüan
  2011-02-02 12:04   ` Sinbad
  0 siblings, 1 reply; 6+ messages in thread
From: Nicolas de Pesloüan @ 2011-02-02  8:23 UTC (permalink / raw)
  To: Sinbad; +Cc: bridge

Le 02/02/2011 09:02, Sinbad a écrit :
> hi,
>
> suppose a vlan has 3 member ports and vlan is configured as an l3 interface
> and if data is suppose to go out using that vlan interface, which
> physical port
> will be chosen among the 3 member ports ?

Can you describe your configuration a little bit more (possibly using the commands used to setup 
that configuration)?

	Nicolas.

^ permalink raw reply	[flat|nested] 6+ messages in thread
* Re: [Bridge] vlan interface egress port
  2011-02-02  8:23 ` Nicolas de Pesloüan
@ 2011-02-02 12:04   ` Sinbad
  2011-02-02 14:42     ` richardvoigt
  0 siblings, 1 reply; 6+ messages in thread
From: Sinbad @ 2011-02-02 12:04 UTC (permalink / raw)
  To: Nicolas de Pesloüan; +Cc: bridge

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hi,

suppose my config is as below.

 # brctl addbr mybridge
 # brctl addif mybridge eth0
 # brctl addif mybridge eth1
 # ifconfig mybridge up
 # ifconfig mybridge 192.168.100.5 netmask 255.255.255.0

now if the an l3 packet has to egress from mybridge
which port will be chosen ?

thanks


On Wed, Feb 2, 2011 at 1:53 PM, Nicolas de Pesloüan <
nicolas.2p.debian@free.fr> wrote:

> Le 02/02/2011 09:02, Sinbad a écrit :
>
>  hi,
>>
>> suppose a vlan has 3 member ports and vlan is configured as an l3
>> interface
>> and if data is suppose to go out using that vlan interface, which
>> physical port
>> will be chosen among the 3 member ports ?
>>
>
> Can you describe your configuration a little bit more (possibly using the
> commands used to setup that configuration)?
>
>        Nicolas.
>

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^ permalink raw reply	[flat|nested] 6+ messages in thread
* Re: [Bridge] vlan interface egress port
  2011-02-02 12:04   ` Sinbad
@ 2011-02-02 14:42     ` richardvoigt
  2011-02-02 14:46       ` richardvoigt
  0 siblings, 1 reply; 6+ messages in thread
From: richardvoigt @ 2011-02-02 14:42 UTC (permalink / raw)
  To: Sinbad; +Cc: bridge

It depends on the destination MAC field in the L2 header of the
outgoing packet (which got filled in from the kernel routing table)

On Wed, Feb 2, 2011 at 6:04 AM, Sinbad <sinbad.sinbad@gmail.com> wrote:
> hi,
>
> suppose my config is as below.
>
>  # brctl addbr mybridge
>  # brctl addif mybridge eth0
>  # brctl addif mybridge eth1
>  # ifconfig mybridge up
>  # ifconfig mybridge 192.168.100.5 netmask 255.255.255.0
>
> now if the an l3 packet has to egress from mybridge
> which port will be chosen ?
>
> thanks
>
>
> On Wed, Feb 2, 2011 at 1:53 PM, Nicolas de Pesloüan
> <nicolas.2p.debian@free.fr> wrote:
>>
>> Le 02/02/2011 09:02, Sinbad a écrit :
>>>
>>> hi,
>>>
>>> suppose a vlan has 3 member ports and vlan is configured as an l3
>>> interface
>>> and if data is suppose to go out using that vlan interface, which
>>> physical port
>>> will be chosen among the 3 member ports ?
>>
>> Can you describe your configuration a little bit more (possibly using the
>> commands used to setup that configuration)?
>>
>>        Nicolas.
>
>
> _______________________________________________
> Bridge mailing list
> Bridge@lists.linux-foundation.org
> https://lists.linux-foundation.org/mailman/listinfo/bridge
>

^ permalink raw reply	[flat|nested] 6+ messages in thread
* Re: [Bridge] vlan interface egress port
  2011-02-02 14:42     ` richardvoigt
@ 2011-02-02 14:46       ` richardvoigt
  2011-02-02 18:54         ` Nicolas de Pesloüan
  0 siblings, 1 reply; 6+ messages in thread
From: richardvoigt @ 2011-02-02 14:46 UTC (permalink / raw)
  To: Sinbad; +Cc: bridge

On Wed, Feb 2, 2011 at 8:42 AM, richardvoigt@gmail.com
<richardvoigt@gmail.com> wrote:
> It depends on the destination MAC field in the L2 header of the
> outgoing packet (which got filled in from the kernel routing table)

Actually I should say it gets filled in during the routing process.
The MAC address actually comes from the ARP table, but which ARP entry
is used is determined by routing.

>
> On Wed, Feb 2, 2011 at 6:04 AM, Sinbad <sinbad.sinbad@gmail.com> wrote:
>> hi,
>>
>> suppose my config is as below.
>>
>>  # brctl addbr mybridge
>>  # brctl addif mybridge eth0
>>  # brctl addif mybridge eth1
>>  # ifconfig mybridge up
>>  # ifconfig mybridge 192.168.100.5 netmask 255.255.255.0
>>
>> now if the an l3 packet has to egress from mybridge
>> which port will be chosen ?
>>
>> thanks
>>
>>
>> On Wed, Feb 2, 2011 at 1:53 PM, Nicolas de Pesloüan
>> <nicolas.2p.debian@free.fr> wrote:
>>>
>>> Le 02/02/2011 09:02, Sinbad a écrit :
>>>>
>>>> hi,
>>>>
>>>> suppose a vlan has 3 member ports and vlan is configured as an l3
>>>> interface
>>>> and if data is suppose to go out using that vlan interface, which
>>>> physical port
>>>> will be chosen among the 3 member ports ?
>>>
>>> Can you describe your configuration a little bit more (possibly using the
>>> commands used to setup that configuration)?
>>>
>>>        Nicolas.
>>
>>
>> _______________________________________________
>> Bridge mailing list
>> Bridge@lists.linux-foundation.org
>> https://lists.linux-foundation.org/mailman/listinfo/bridge
>>
>

^ permalink raw reply	[flat|nested] 6+ messages in thread
* Re: [Bridge] vlan interface egress port
  2011-02-02 14:46       ` richardvoigt
@ 2011-02-02 18:54         ` Nicolas de Pesloüan
  0 siblings, 0 replies; 6+ messages in thread
From: Nicolas de Pesloüan @ 2011-02-02 18:54 UTC (permalink / raw)
  To: Sinbad; +Cc: bridge

Le 02/02/2011 15:46, richardvoigt@gmail.com a écrit :
> On Wed, Feb 2, 2011 at 8:42 AM, richardvoigt@gmail.com
> <richardvoigt@gmail.com>  wrote:
>> It depends on the destination MAC field in the L2 header of the
>> outgoing packet (which got filled in from the kernel routing table)
>
> Actually I should say it gets filled in during the routing process.
> The MAC address actually comes from the ARP table, but which ARP entry
> is used is determined by routing.

1/ Routing will decide which IP is the next hop.
2/ ARP table will convert this IP into a MAC address.
3/ The bridge code will decide which port to use, based on whether it learned this MAC address on 
any port or not. This is the normal behavior of any bridge/switch.

- If the bridge learned this MAC address, it will forward the packet to this port only.
- If the bridge didn't learned this MAC address, it forward the packet to all ports.

To display the currently learned MAC address and associated port, use brctl showmacs <bridge_name>

	Nicolas.
>
>>
>> On Wed, Feb 2, 2011 at 6:04 AM, Sinbad<sinbad.sinbad@gmail.com>  wrote:
>>> hi,
>>>
>>> suppose my config is as below.
>>>
>>>   # brctl addbr mybridge
>>>   # brctl addif mybridge eth0
>>>   # brctl addif mybridge eth1
>>>   # ifconfig mybridge up
>>>   # ifconfig mybridge 192.168.100.5 netmask 255.255.255.0
>>>
>>> now if the an l3 packet has to egress from mybridge
>>> which port will be chosen ?
>>>
>>> thanks
>>>
>>>
>>> On Wed, Feb 2, 2011 at 1:53 PM, Nicolas de Pesloüan
>>> <nicolas.2p.debian@free.fr>  wrote:
>>>>
>>>> Le 02/02/2011 09:02, Sinbad a écrit :
>>>>>
>>>>> hi,
>>>>>
>>>>> suppose a vlan has 3 member ports and vlan is configured as an l3
>>>>> interface
>>>>> and if data is suppose to go out using that vlan interface, which
>>>>> physical port
>>>>> will be chosen among the 3 member ports ?
>>>>
>>>> Can you describe your configuration a little bit more (possibly using the
>>>> commands used to setup that configuration)?
>>>>
>>>>         Nicolas.
>>>
>>>
>>> _______________________________________________
>>> Bridge mailing list
>>> Bridge@lists.linux-foundation.org
>>> https://lists.linux-foundation.org/mailman/listinfo/bridge
>>>
>>
>


^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2011-02-02 18:54 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-02-02  8:02 [Bridge] vlan interface egress port Sinbad
2011-02-02  8:23 ` Nicolas de Pesloüan
2011-02-02 12:04   ` Sinbad
2011-02-02 14:42     ` richardvoigt
2011-02-02 14:46       ` richardvoigt
2011-02-02 18:54         ` Nicolas de Pesloüan

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