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Dinesh Dutt 91e6a0e5ca ospf: Convert MAX_AGE LSA list to tree 
Store the MaxAge LSA list in a tree instead of a linked list for efficient access.
Walking the list can be quite inefficient in some large systems and under certain tests.

ospfd maintains the list of LSA's that have been MaxAge'd out in a separate
linked list for removal by a remover/walker thread. When a new LSA is to be
installed, the old LSA is ejected and when it is ejected, the MaxAge LSA list
is traversed to ensure that the old LSA is also removed from this list if it
exists on this list.

When a large number (> 5K) MaxAge LSAs are bombarding the system, walking this
list takes a significant time causing timers to fire and actions to be taken
such as expiring neighbors due to expiry of DeadInterval (especially when timer
is really low, <= 12s), creating a spiral of instability.

By making this MaxAge LSA list be a tree, this problem is mitigated.

Signed-off-by: Dinesh Dutt <ddutt@cumulusnetworks.com>
Reviewed-by: Ayan Banerjee <ayan@cumulusnetworks.com>
Reviewed-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Reviewed-by: Shrijeet Mukherjee <shm@cumulusnetworks.com>
Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
2013-01-07 09:59:43 -08:00
babeld *: use array_size() helper macro 2012-10-25 10:15:59 -07:00
bgpd bgpd: Fixed out-of-date comment 2012-11-30 21:10:25 +01:00
doc doc: add blurbs on zebra FPM interface and commands 2012-11-30 21:41:17 +01:00
fpm fpm: Add public header for Forwarding Plane Manager 2012-11-30 21:41:17 +01:00
guile build: allow configure and build in a separate directory 2012-06-25 19:03:23 +02:00
init build: delete .cvsignore files 2011-12-13 14:27:01 +04:00
isisd isisd: fix ipv6 metric endianness 2012-12-12 15:38:14 +01:00
lib build: include git info 2012-12-12 15:34:37 +01:00
m4 build: delete .cvsignore files 2011-12-13 14:27:01 +04:00
ospf6d *: use array_size() helper macro 2012-10-25 10:15:59 -07:00
ospfclient build: correct libtool parameter used within Makefiles 2012-09-25 05:56:00 +02:00
ospfd ospf: Convert MAX_AGE LSA list to tree 2013-01-07 09:59:43 -08:00
pkgsrc build: delete .cvsignore files 2011-12-13 14:27:01 +04:00
ports build: delete .cvsignore files 2011-12-13 14:27:01 +04:00
redhat redhat: add systemd service files 2012-05-01 17:51:26 +02:00
ripd *: use array_size() helper macro 2012-10-25 10:15:59 -07:00
ripngd *: use array_size() helper macro 2012-10-25 10:15:59 -07:00
solaris build: delete .cvsignore files 2011-12-13 14:27:01 +04:00
tests tests: fix missing array_size() include 2012-11-03 09:13:23 -07:00
tools tools: use standard interpreter path in all Perl scripts 2012-04-30 16:13:47 +02:00
vtysh zebra: add module to communicate routes to FPM 2012-11-30 21:41:17 +01:00
watchquagga *: use array_size() helper macro 2012-10-25 10:15:59 -07:00
zebra zebra: include intf when sending IPv4 nexthop to FPM 2012-11-30 21:41:17 +01:00
.gitignore build: ignore mkinstalldirs and texinfo.tex 2010-04-28 20:57:44 -04:00
AUTHORS Initial revision 2002-12-13 20:15:29 +00:00
bootstrap.sh autoreconf -i 2007-02-06 19:28:28 +00:00
ChangeLog [trivia] Make 'make dist' happy about ChangeLog expunge 2008-08-23 08:36:42 +01:00
configure.ac build: include git info 2012-12-12 15:34:37 +01:00
COPYING Initial revision 2002-12-13 20:15:29 +00:00
COPYING.LIB Initial revision 2002-12-13 20:15:29 +00:00
HACKING.pending HACKING.pending: Add Quagga-RE details 2012-03-02 11:56:38 +00:00
HACKING.tex HACKING.tex: Change to a LaTeX version of HACKING 2012-03-08 16:14:13 +00:00
INSTALL.quagga.txt delete CVS keywords 2011-09-27 21:34:26 +04:00
Makefile.am build: compile tests/ by default 2012-11-03 09:51:21 -07:00
NEWS release: 0.99.21 2012-05-01 21:43:53 +02:00
README 2004-11-12 Paul Jakma <paul@dishone.st> 2004-11-12 10:30:21 +00:00
README.NetBSD Omit --opaque-lsa from build (now default). 2011-06-28 15:05:05 -04:00
REPORTING-BUGS Update for git and emphasize asking for good reports. 2010-05-05 07:51:26 -04:00
SERVICES 2607/tcp is already used by ospfapi. 2003-12-23 10:42:45 +00:00
stamp-h.in Initial revision 2002-12-13 20:15:29 +00:00
TODO [TODO] Note MED functionality we should implement 2006-03-30 14:36:23 +00:00
update-autotools * README.NetBSD: use update-autotools instead of autoreconf 2007-02-02 16:52:38 +00:00

README 

Quagga is free software that manages various IPv4 and IPv6 routing
protocols.

Currently Quagga supports BGP4, BGP4+, OSPFv2, OSPFv3, RIPv1,
RIPv2, and RIPng as well as very early support for IS-IS.
  
See the file INSTALL.quagga.txt for building and installation instructions.
  
See the file REPORTING-BUGS to report bugs.
  
Quagga is free software. See the file COPYING for copying conditions.