On Tue, 12 Jan 2010 12:33:46 EST, Ye Wang said:
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?
That's a total "it depends" question. We've had several instances where backhoe fade or hardware issues have killed our primary off-site link and taken 80% of our bandwidth with it, and we just put up a "The Internet Will Be Slow For A Bit" notice and keep going, as most of our traffic is basically bulk data transfer and we're OK as long as all the bits eventually arrive. For other organizations, the resulting slowdown may be totally unacceptable - if you're doing a lot of video streaming or VoIP, it would be fatal.