Can MPLS TE FRR AutoTunnels suffer from temporary loops?
I am currently working through the design studies in the Cisco Press book "Definitive MPLS Network Design"
I have come accross one thing in the USCom FRR AutoTunnel section, that I don't understand.
It is the part with Temporary Loop Avoidance. You can read it here http://www.ciscopress.com/articles/article.asp?p=402224&seqNum=7 about half-way down the page.
The section sates that in case of reconvergence, when the LSDBs are not yet syncronized, it may lead to temporary loops.
But I don't think this is the case, as the network is using One-Hop tunnels with NHOP backup tunnels.
When the traffic hits the St. Louis router, it will not get routed back to Chicago, beacuse St. Louis has a LSP going directly to Washington via Dallas.
Can enyone explain to me, in what condition this would result in a loop?
For sure, it will cause suboptimal routing, but in my opinion never a loop.