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Dear Sir,
I am study the ctr-mcast protocol implemented in ns. Now I am wondering about how the steiner node join the group. When a node join a group, some nodes may be on the branch(named steiner nodes). A steiner node has an
active replicator
about the soure and group. When the leafnode which is
downstrem of the steiner node
leave the group, the oif of the steiner node refering to the leaving leafnode will
be disbaled and the replicator on this steiner node will be not active. So the prune
process will go on upstream untill reach a node who itself is a group menber.
Now, suppose a steiner node jion the group
too. What happend to the steiner node's
replicator? If nothing was done, when the downsteam node leave
group, this node which
before was a steiner node but now it is not will be pruned
also! I can not figure out
what happend to steiner node when it jion the group from the
*.tcl about ctr-mcast.
One of my comprehension is: when a steiner
node jion a , it attach an LossMonitor
agent on the replocator and a slot was added to this LossMonitor agent.So when all
oifs
are disabled, the replicator is still active. So the prune
message will not be passed
on upstream.
My understanding is made from these
sentences:
set rcvr [new
Agent/LossMonitor] $ns attach-agent $n3 $rcvr $n3 join-group $rcvr $group0 Am I right? Is
there any misunderstanding about my comprehension on the
replicator?
Any rectification is appreciated!
Thank you for your
attention. |