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From: Qing Li <qingli@FreeBSD.org>
Date: Tue, 9 Mar 2010 01:11:45 +0000 (UTC)
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Subject: cvs commit: src/sys/net flowtable.c radix.c radix_mpath.c route.c
 route.h src/sys/netinet in.c ip_output.c
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qingli      2010-03-09 01:11:45 UTC

  FreeBSD src repository

  Modified files:
    sys/net              flowtable.c radix.c radix_mpath.c route.c 
                         route.h 
    sys/netinet          in.c ip_output.c 
  Log:
  SVN rev 204902 on 2010-03-09 01:11:45Z by qingli
  
  One of the advantages of enabling ECMP (a.k.a RADIX_MPATH) is to
  allow for connection load balancing across interfaces. Currently
  the address alias handling method is colliding with the ECMP code.
  For example, when two interfaces are configured on the same prefix,
  only one prefix route is installed. So connection load balancing
  among the available interfaces is not possible.
  
  The other advantage of ECMP is for failover. The issue with the
  current code, is that the interface link-state is not reflected
  in the route entry. For example, if there are two interfaces on
  the same prefix, the cable on one interface is unplugged, new and
  existing connections should switch over to the other interface.
  This is not done today and packets go into a black hole.
  
  Also, there is a small bug in the kernel where deleting ECMP routes
  in the userland will always return an error even though the command
  is successfully executed.
  
  MFC after:      5 days
  
  Revision  Changes    Path
  1.25      +2 -1      src/sys/net/flowtable.c
  1.49      +2 -0      src/sys/net/radix.c
  1.11      +2 -1      src/sys/net/radix_mpath.c
  1.173     +30 -8     src/sys/net/route.c
  1.88      +2 -0      src/sys/net/route.h
  1.158     +8 -0      src/sys/netinet/in.c
  1.323     +5 -1      src/sys/netinet/ip_output.c