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