[pim] 答复: DR priority adjustment automatically according to the status of the tracked interfaces

[Xu Xiaohu <xuxh at huawei.com>]

The figure is updated as follows:

                     |
                     |    +-----+         +------------------------+
                    +---+ R1 +-----+                                  |
                     |    +-----+         |
|
 +-------+      |                        |
|      +----------+
 |Client +---+                        | PIM-SM Network   +----+Source |
 +-------+      |                        |
|      +----------+
                     |      +-----+       |
|
                    +---+ R2  +-----+                                 |
                     |      +-----+      +------------------------+
                     |

Xiaohu 

> -----邮件原件-----
> 发件人: pim-bounces at ietf.org [mailto:pim-bounces at ietf.org] 代表 Xu Xiaohu
> 发送时间: 2009年8月5日 11:00
> 收件人: pim at ietf.org
> 主题: [pim] DR priority adjustment automatically according to 
> the status of the tracked interfaces
> 
> Hi all,
> 
> In the following PIM-SM (or SSM) scenario, R!, R2 and Client 
> are located with the same LAN. R1 is elected as the DR for 
> that LAN. Now R1's uplink to the PIM-SM Network  is down, as 
> long as R1 still acts as the DR, the multicast stream will be 
> broken soon or later. 
> 
>              |
>              |   +-----+    +------------------+
>              +---+ R1  +----+                  |
>              |   +-----+    |                  |
>  +-------+   |              |                  |  +-------+
>  |Client +---+              | PIM-SM Network   +--+Source |
>  +-------+   |              |                  |  +-------+
>              |   +-----+    |                  |
>              +---+ R2  +----+                  |
>              |   +-----+    +------------------+
>              |
> 
> I wonder whether it is suitable for the DR (e.g., R1 in the 
> above figure) to track the upstream link, and once the 
> tracked link is down, its DR priority is reduced 
> automatically so as to cease the DR role. Of couse, this 
> mechanism is also suitable for the scenario where the 
> Multicast Souce is connected to more than one PIM routers via LAN.
> 
> Any comment? Or whether some vendor has already implement 
> this feature?
> 
> Xiaohu
> 
> 
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