Title: DECbrouter90 V9.14 example of upgrading software over a WAN connection

Product: DECbrouter90 V9.14

Question: How can I utilize tftp over a WAN port to upgrade my DECbrouter90's
          system image?

Solution:

    
        There are some undocumented steps required in order to load a new
system image into flash via tftp *over a WAN port*. 

        When in Bootstrap mode, the brouter doesn't run any routing protocol 
(i.e., RIP, IGRP) on its ports, and so will be unaware of any networks other 
than the directly attached networks. So, for the following config:


       39.5.7.1 (S0)                      39.5.7.2 (S0)
  DB90-1 --------------39.5.7.0---------------------DB90-2       TFTP load host
    |                                                 |             |
    | 39.5.6.1 (E0)                     39.5.5.1 (E0) |             |
---------                                       ----------------------------
39.5.6.0                                                39.5.5.0

        DB90-1 will have no path to the 39.5.5 network while in boot mode. 
Assuming that S0 is the port we wish to load over, on DB90-1, you must 
issue some extra commands at the (Boot)> prompt:

ip route 39.5.5.0 39.5.7.2   (To enter a static route to the load host)
int E 0
shutdown
int S 1
shutdown

        *ALL* ports other than the load port must be shutdown for tftp to
work. Also, ip unnumbered ports will not work; the serial port MUST have an 
IP address, in order for the static route command (ip route 39.5.5.0 39.5.7.2) 
to work. At this point, the normal "copy tftp flash" command may be used to
load the new image.