[j-nsp] Loop Free Alternates topology recommendations

Clarke Morledge chmorl at wm.edu
Fri Dec 17 15:16:37 EST 2010

I wanted to resurrect an older thread regarding the Loop Free Alternates 
feature now available in Junos for OSPF and IS-IS.


I am wondering if anyone has any pointers regarding what type of 
topologies do not work so well and why.

I am running LFA in an environment where I know that I have multiple paths 
existing to where I need it, but unfortunately, I am not getting the type 
of backup coverage that I would like.

For example, certain types of square topologies do not work well for some 
reason, but I am wondering if making link cost changes could rectify this 

Clarke Morledge
College of William and Mary
Information Technology - Network Engineering
Jones Hall (Room 18)
Williamsburg VA 23187

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