netdev - Re: If bridge have no sub-interfaces, it's status may be still with 'RUNNING'

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Date:	Wed, 25 Feb 2015 13:29:47 +0800
From:	yzhu1 <Yanjun.Zhu@...driver.com>
To:	David Ahern <dsahern@...il.com>,
	Stephen Hemminger <stephen@...workplumber.org>
CC:	netdev <netdev@...r.kernel.org>,
	"Wu, Kuaikuai" <Kuaikuai.Wu@...driver.com>,
	"Tao, Yue" <Yue.Tao@...driver.com>
Subject: Re: If bridge have no sub-interfaces, it's status may be still with
 'RUNNING'

On 02/25/2015 12:23 PM, David Ahern wrote:
> On 2/24/15 7:55 PM, yzhu1 wrote:
>> Hi, Stephen && David
>>
>> Any update?
>
> As I mentioned in my last response I see no problem with the existing 
> behavior -- 3.18, 3.19 and 4.0-rc1. With all of them the bridge stays 
> in the running state after all interfaces are removed.
>
> David
>
>
>
Hi, David

I made tests on kernel 3.19-rc7.

1. brctl addbr br0

2. ifconfig br0 up

3. ifconfig br0 (br0's status is with 'RUNNING')

br0       Link encap:Ethernet  HWaddr 0a:70:0b:06:34:8f
           inet6 addr: fe80::870:bff:fe06:348f/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
           TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:0 (0.0 B)  TX bytes:5054 (5.0 KB)

4. brctl addif br0 eth1

5. brctl delif br0 eth1

6. ifconfig br0 (br0's status is without 'RUNNING')

br0       Link encap:Ethernet  HWaddr 00:00:00:00:00:00
           inet6 addr: fe80::870:bff:fe06:348f/64 Scope:Link
           UP BROADCAST MULTICAST  MTU:1500  Metric:1
           RX packets:328 errors:0 dropped:5 overruns:0 frame:0
           TX packets:19 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:39997 (39.9 KB)  TX bytes:5760 (5.7 KB)

Please compare with the outputs of step 3 and step 6, we can find the 
difference.

uname:

Linux wind-virtual-machine 3.19.0-rc7 #2 SMP Wed Jan 28 18:36:44 CST 
2015 x86_64 x86_64 x86_64 GNU/Linux

So I think we should apply the latest patch to make consistent.

Any reply is appreciated.

Zhu Yanjun
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