The DTN Reference Implementation - Delay Tolerant Networking ...
The DTN Reference Implementation - Delay Tolerant Networking ...
The DTN Reference Implementation - Delay Tolerant Networking ...
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Example Event / Action Flow<br />
User configures a new<br />
ONDEMAND TCP link<br />
and a route for the link.<br />
event: LINK_CREATED<br />
event: LINK_AVAILABLE<br />
Router adds link to<br />
route table.<br />
TCPCL interface accept()’s<br />
a new connection and<br />
constructs a new bundle<br />
from the wire.<br />
event: BUNDLE_ARRIVED<br />
Router matches the link in<br />
the route table as the only<br />
next hop for the bundle.<br />
action: STORE_ADD<br />
action: OPEN_LINK<br />
Database stores the bundle.<br />
TCPCL resolves the destination<br />
admin string and establishes a<br />
connection to the next hop.<br />
event: CONTACT_UP<br />
Router checks the link, finds<br />
a pending bundle, moves<br />
the bundle to the contact.<br />
action: ENQUEUE_BUNDLE<br />
TCP Connection thread picks<br />
bundle off contact queue,<br />
sends it to the next hop.<br />
Router checks bundle<br />
mappings and finds<br />
no other destinations<br />
action: STORE_DEL<br />
Database removes<br />
the bundle.<br />
3/13/05 <strong>DTN</strong> <strong>Reference</strong> <strong>Implementation</strong> 16<br />
event: BUNDLE_TRANSMITTED<br />
Disruption occurs on the<br />
connection, TCPCL times<br />
out on a keepalive message<br />
event: CONTACT_DOWN<br />
event: LINK_UNAVAILABLE<br />
Router checks queues for<br />
any bundles that need to be<br />
re-routed to other links.
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