Title: DECbrouter90 DECnet Address Translation Gateway (ATG) example

Product: DECbrouter90 V9.14/V10.x

Question: I need to link two DEcnet phaseIV networks, but want the DECnet
          nodes in one network to appear to be in the same PhaseIV area as the
          nodes in the second network. Can DECnet ATG perform this function?

Solution: 

        The DECnet Address Translation Gateway function in the DECbrouter90 can
map addresses in one PhaseIV area to addresses in another PhaseIV area. This is
useful to "hide" DECnet areas due to PhaseIV address exhaustion. It can also 
be used if two areas are being linked which have identical addresses (For
instance, two companies which are both using DEcnet area 1), and renumbering is
not a desirable option.

        In the example below, ATG is set up in area 10 only.
The DECbrouter on the Area 40 side is an area router for area 40.  The
Area 10 DECbrouter is level 1 so the area 40 routing information is not
propagated to Area 10.



                         
(40.14) (40.998)(40.999)(40.1000)                  (10.209) (10.504)    (10.497)
10.1     61.741  10.348   10.299                      40.12   40.10      40.11
 |         |     |        |   +--+             +--+    |        |         |
 |         |     |        |   |  |       ------|  |    |        |         |
------------------------------|  |------/      |  |---------------------------- 
        Area 10               |  |             |  |       Area 40
                              +--+             +--+
                              BRUTA             BRUTB
                             10.969            40.1
                             (40.2)


BRUTA config:
!
decnet 0 routing 10.969
decnet 0 node-type routing-iv
!
decnet 1 routing 40.2
decnet 1 node-type area
!
!note that when you type in the whole map command
!only the first COMPLETE line displays
!
decnet 0 map 10.209 1 40.12 \
10.504 1 40.10 \
10.497 1 40.11
decnet 1 map 40.1000 0 10.299 \
40.999 0 10.348 \
40.998 0 61.741 \
40.14 0 10.1
!
interface Ethernet 0
decnet 0 cost 10
decnet 0 router-priority 1
no lat enabled
!
interface Serial 0
decnet 1 cost 10
decnet 1 router-priority 1