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Trace file:
session.nam.gz
Purpose:
demonstrate the difference in between regular (detailed) packet
forwarding and session level packet scheduling
Topology:
255 nodes and 266 links partial MBone topology
equal link bandwidth (512bps) and delay (10ms)
obtained by Mark Handley's(mjh@east.isi.edu) MBone trace tools
Source:
node 209
noted in red
Members:
30 of them
randomly selected
noted in black
Traffic:
1 pkt every 37.5ms
210 bytes per packet
starting at simulation time 1.0
Graph on the left:
- regular/detailed multicast packet forwarding
- packets traverse through nodes and links (basically a multicast
tree) to reach group members.
Graph on the right:
- session level packet scheduling
- the delay to transfer a packet from the source to its
receiver is computed and a receive(pkt) event is directly
scheduled to happen after the delay at the receiver
- number of red dots attached to group receivers represents the
number of packets that have been sent and waiting to be received.
- the larger the (delay x bandwidth) in between the source and
receiver, the higher the queue of red dots.
Polly Huang, Mon Mar 16 15:52:40 PST 1998
huang@isi.edu
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