Hi, I am doing some research on the backup routing issue. I know Fast ReRoute bypass routing such as MPLS FRR is used by many networks. You may have experienced with this thing pretty well, and can teach me a little bit. My question is: current FRR scheme seems only guarantee network reachability under link/node failure, but not bandwidth (say, if my primary link is carrying 1Gbps, but my bypass path has a capacity of only 100Mbps, then the bandwidth for the traffic under failure is limited). Do you think the reachability level of protection is good enough? Has anyone here encountered any issues with FRR (say, bypass routing could not save your network service during unexpected accident, e.g., concurrent failures of multiple devices)? Is there any example case (or any news and reports regarding this question) I can study? Another thing I want to understand is: if I want to protect a lot of links/nodes (in addition to a few major ones), is the configuration job easy of difficult? My knowledge so far tells me that it is not easy at all. I don't know what is going on in practice. If you can share your experience with me, it will be great. Many Thanks, sando