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CSE
588 lecture
May 8, 1997
Steve Corbató
corbato@cac.washington.edu
Networks and Distributed Computing
Computing & Communications
University of Washington
% traceroute mail1.microsoft.com traceroute to mail1.microsoft.com (131.107.3.41), 30 hops max, 40 byte packets 1 innovac.cac.washington.edu (140.142.100.100) 4 ms 0 ms 4 ms 2 uwbr2.cac.washington.edu (140.142.150.24) 4 ms 4 ms 0 ms 3 seabr1-gw.nwnet.net (204.200.8.5) 66 ms 12 ms 4 ms 4 microsoft-t3-gw.nwnet.net (198.104.192.9) 4 ms 0 ms 0 ms 5 204.200.31.1 (204.200.31.1) 4 ms 4 ms 4 ms 6 131.107.2.99 (131.107.2.99) 4 ms 4 ms 4 ms 7 mail1.microsoft.com (131.107.3.41) 8 ms 8 ms 4 ms
A B C D
+------------------------
A-----B A | 0 1 1 - (2)
| | B | 1 0 - (2) 1
| | C | 1 - (2) 0 1
C-----D D | - (2) 1 1 0
Area 1
+---------+
| R4 |
Backbone (Area 0) |(ABR) | |
+---------------------------+ | |
| | R3---+ |
| R2--+ ASBR +-|--|----+
| +----R1-----------+ |
+---------------------------+
Internet
Source (S)
| MR forwards packets
| Ifc 1 out Ifc N only if
Multicast Router (MR) MR's route to S is
| Ifc N via Ifc 1
|
mcast.cac.washington.edu% mrinfo
127.0.0.1 (localhost) [version 3.8,prune,genid,mtrace]:
140.142.116.1 -> 0.0.0.0 (local)
[1/1/disabled]
140.142.116.1 -> 204.70.164.29 (dec3800-1-fddi-0.Sacramento.mci.net)
[1/64/tunnel/leaf]
140.142.116.1 -> 198.48.92.100 (viking.cac.washington.edu)
[1/1/tunnel/leaf]
140.142.116.1 -> 192.220.249.66 (seamr2-gw.nwnet.net)
[1/32/tunnel/leaf]
140.142.116.1 -> 128.95.176.140 (eos.atmos.washington.edu)
[1/1/tunnel]
Postscript version of this schematic
Postscript version of this schematic
Next generation campus network objectives
Envisioned UW campus network upgrade
Ideal Next Generation Router Specification
Click here