Is FRR protection good enough?

Ye Wang sandofree at
Tue Jan 12 17:33:46 UTC 2010


I am doing some research on the backup routing issue.

I know Fast ReRoute bypass routing such as MPLS FRR is used by many
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,

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