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Internet Message Format  |  1992-08-12  |  1.5 KB
  1. Path: sparky!uunet!olivea!bu.edu!buengc.bu.edu!apollo
  2. From: apollo@buengc.bu.edu (Doug A. Chan)
  3. Newsgroups: comp.dcom.sys.cisco
  4. Subject: Will this circuit backup solution work?
  5. Message-ID: <93539@bu.edu>
  6. Date: 13 Aug 92 04:33:48 GMT
  7. Sender: news@bu.edu
  8. Distribution: na
  9. Organization: College of Engineering, Boston University, Boston, MA, USA
  10. Lines: 24
  11. Originator: apollo@buengc.bu.edu
  12.  
  13. I'm going to have two MGS connected over a dedicated 56Kbps circuit.
  14. Currently I've got enough equipment around to setup a backup circuit using
  15. switched-56/ISDN-BRI but it all hinges on whether the router can be 
  16. configured to work with it.
  17.  
  18.  [ROUTER_A]                                                [ROUTER_B]
  19.      #                                                       #    #
  20.      #                                                       #    #
  21.      #    /--{ded-56}----------//------------{ded-56}---[CSU_B]   #
  22.   [CSU_A]<                                                        #
  23.           \--{sw-56}-----------//-----------{ISDN}--[TERMINAL_ADAPTER]
  24.  
  25. CSU_A can pull up a switched circuit when the dedicated line is down.
  26. Suppose router_A's serial port IP address is 200.200.200.1 and router_B
  27. has 200.200.200.2 and 200.200.200.3 for it's interfaces.  Obviously,
  28. router_B will be talking thru either one of two serial ports depending
  29. on the state of the dedicated circuit.
  30. Will either/both routers run into problems with sudden changes of it's
  31. "path"?
  32.  
  33. FYI, Router_A is running 8.3.3 while router_B has 8.2.7.
  34.  
  35. -Doug
  36. apollo@buengc.bu.edu
  37.