I am facing the following problem.
I have a switched network built over VPLS Cloud.
Switch 1 is root switch and there are multiple switches connecting to VPLS cloud including switch 2.
All were working fine until one fine day one of the Amplifier used on the VPLS provider cloud failed resulting in Uni-directional link. This has resulted in a traffic storm and my whole network was brought down.
We were able to simulate this problem inside the lab network. And all cisco documentation pointed to UDLD/Spanning tree Loop Guard feature as the remedy.
UDLD as pottential work around failed because of the following reason.
1) Aggressive mode UDLD did not result in spanning tree loop prevention because I have a point to Multipoint network segment.
2) Normal mode also did not help either.
I then tested Loop guard Feature. This worked but I ran upon a limitation.
Loop Guard help with Transmit side of the Root switch went down.
However it did not work when the recive side of the root switch went down.
Pls. Note : When I enabled Loopguard, I was able to supress the traffic strom completely in all scenarios. However network did not reconverge when the receive side of the Root switch went down.
Is there any workaround for this problem.
It would be great if you can help me solve this issue.
Thanks and Regards