vsi trigger STP

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<?xml:namespace prefix = "v" ns = "urn:schemas-microsoft-com:vml" /> <?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" />
【Problem Description】

Aftercommunicate with L1 engineer by email at 10:18 am time, the problem is VSI shifting while LDP down cannot trigger MSTP, L1 wants to solve it , solution should be supplied before2018-04-13.

【Problem Analysis】
topology is like this:

After remote tonight ,  this issue is what  VSI down cann't trigger the interface becoming Forwarding from Discarding of STP state.

 the RD will test a way to solve it , solution will be provided on this week.
 
And please ask customer feedback the diagnostic-information of below six devices
Govind-Puri  // Net4Plant // Sormandal  // Google  // Maxmode //  Core-127000

【Root Cause】

 the link between PE is down (VSI is down ), wiil not send message to CE , MSTP cannot feel uplink changge , it's decide by protocol . 
tha's why when VSI down ,cannot trigger MSTP state.
【Solution Description】

Hi sir,

Please see my as below
         Using  monitor-link to trigger the VSI and MSTP ,when the uplink is down ,can trigger the downlink down too ,and vice versa for UP status..
         Please refer the command as below
         <GoogleNet-S5720>

[GoogleNet-S5720] monitor-link group 1

[GoogleNet-S5720-mtlk-group1] port XGigabitEthernet0/0/1 uplink

[GoogleNet-S5720-mtlk-group1] port GigabitEthernet0/0/1  downlink 1

[GoogleNet-S5720-mtlk-group1] port GigabitEthernet0/0/2  downlink 2

         [Net4planet-S5720]

[Net4planet -S5720] monitor-link group 1

[Net4planet -S5720-mtlk-group1] port XGigabitEthernet0/0/1 uplink

[Net4planet -S5720-mtlk-group1] port GigabitEthernet0/0/1  downlink 1

[Net4planet -S5720-mtlk-group1] port GigabitEthernet0/0/2  downlink 2

         Please refer link as below:
         http://support.huawei.com/hedex/pages/EDOC1000101619DEF0414R/06/EDOC1000101619DEF0414R/06/resources/dc/port_monitor_link_group_view.html?ft=0&fe=10&hib=12.1.13.4.9&id=port_monitor_link_group_view&text=port (Monitor Link group view)&docid=EDOC1000101619
 

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