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A comment on GitHub is getting DDoSed again. Parent comment

Re:GitHub is getting DDoSed again by ghratch on Sunday March 10, 2013 @08:05AM (#5351555)
I thought spanning trees were elected/discovered automatically by the routers themselves instead of being manually set up.
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Re:GitHub is getting DDoSed again by krunaldo on Sunday March 10, 2013 @12:55PM (#5352526)
Yes and no :)

The tree is built up automatically but you can weight the paths and also which is the start node of the tree. There are also a lot of settings that may or may not completely fuck you over or fix a problem.

Also you really want to disable STP on ports going to servers as this will 1) speed up recovery 2) prevent any malicious packets going out from them.

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