Named-data Link State Routing ( NLSR ): NLSR is routing protocol caluclate routing table dynamically and manipulate ccnd forwarding information base (FIB) based on routing table.
Download: Check out the code from the github by following git://github.com/NDN-Routing/NLSR0.0.git
Installation: For installation of NLSR you must need to have ccnd installed. Go to NLSR0.0. Then make it and install by following
$make $sudo make install
Configuring NLSR: For the explanation of configuring NLSR, we will consider following network topology.
---------
| |
| | /ndn/memphis.edu/castor
---------
face9/ \ face11
/ \
/ \
/ \
face7/ \ face10
--------- --------- ---------
| |face8 face11 | |face13 face7| |
| |---------------| |--------------------| |
--------- --------- ---------
-/ndn/memphis.edu/pollux /ndn/memphis.edu/mira /ndn/memphis.edu/sirius
3.1 Creating faces for neighbors For configuring of NLSR first system admin first need to create faces for the neighbors. For router having router-name /ndn/memphis.edu/castor, system admin need to create two faces for neighbors routers /ndn/memphis.edu/pollux and /ndn/memphis.edu/mira. By ccndc utility one can create face as below
$ccndc add /ndn/memphis.edu/pollux udp pollux.cs.memphis.edu $ccndc add /ndn/memphis.edu/mira udp mira.cs.memphis.edu
Let us assume that that face id for /ndn/memphis.edu/pollux is 9 and /ndn/memphis.edu/mira is 11.
3.2 Configuration Commands 3.2.1 router-name /name/prefix/of/router router-name commands assigns name of the router. Router-name is unique in the network and maintained by name management. This is mandatory configuration command.
3.2.2 ccnneighbor /name/prefix/of/neighbor/router faceX. By this command router configures neighboring router. X is integer and must be precedeed by "face". faceX is the connecting face for that neighbors.
3.2.3 ccnname /name/prefix/to/be/advertised With this configuration command router advertise name prefix
3.2.4 lsdb-synch-interval secs its the time interval after which neighbors will synchronize Link State Database. Default value is 300.
3.2.5 interest-retry tries its number of tries router will try if interest is timed out. Defualt value is 3.
3.2.6 interest-resend-time secs its the amount of time after which interest for a content will timed out. Defualt value is 15.
3.2.7 lsa-refresh-time secs its the amount of time after which router will regenerate its own LSDB and regenerate every LSA. Default value is 1800.
3.2.8 router-dead-interval secs its the amounnt of time after which a router will consider its neighbor dead if it does not hear anything from the neighbor. Default value 3600.
3.2.9 multi-path-face-num n with this command one activate to do multi-path routing. If n is greater than 1 then multi-path is triggered on and n faces will be added in ccnd fib after routing table calculation. Default value is 0 and then NLSR perform single path routing.
3.2.10 logdir path/to/log/dir By this command one can configure where NLSR will write logfiles. By default NLSR will write log file to /home/nlsrLog/ directory.
3.3 Sample configuration file Let assume that router /ndn/memphis.edu/castor wants to advertise two names /ndn/memphis.edu/cslab/netlab and /ndn/memphis.edu/cslab/wisemanet. Configuration file for /ndn/memphis.edu/castor will look like below
!-----Configuration file starts here
router-name /ndn/memphis.edu/castor ccnneighbor /ndn/memphis.edu/mira face10 ccnneighbor /ndn/memphis.edu/pollux face7 ccnname /ndn/memphis.edu/cslab/netlab ccnname /ndn/memphis.edu/cslab/wisemanet
lsdb-synch-interval 350 interest-retry 3 interest-resend-time 10 lsa-refresh-time 1800 router-dead-interval 3600 multi-path-face-num 2 logdir /home/nlsrLog/
!-----Configuration file ends here