Configure the desired access control for this example by building an exclusive filter
on the PPP/0 interface of router 4.3 as shown in Figure 17. To configure the
example given for router 4.3 in Figure 17, enter the following NCP commands and
parameters:
NCP> def mod access-cont circ ppp/0 type exclusive
NCP> def mod access-cont circ ppp/0 filter 0.0 0.0 4.4 63.1023
NCP> def mod access-cont circ ppp/0 state on
Managing Traffic Using Area Routing Filters
Area routing filters allow special configurations of your DNA network. Because this
is an advanced topic, very few DNA IV networks need routing filters. There are two
primary applications for area filtering in DNA IV:
v Security, limiting access to some group of areas from other areas.
v Allowing the blending of two DECnet address spaces.
Note: Area Routing Filters are very tricky and subtle to configure. It is very easy
to completely break your area routing. If you do not understand how
DECnet routing works, especially at the area level, do not try to use
routing filters. Documentation on the DECnet routing protocol can be
found in
DECnet Digital Network Architecture Phase-IV Routing Layer
Functional Description
, Order Number AAX435ATK, December 1983,
Digital Equipment Corporation, Maynard, Massachusetts.
Source
Result
Source
Mask
Destination
Result
Destination
Mask
Exclusive Filter Information
0.0 0.0 4.4 63.1023
4.1 4.4
4.3
Rest of Campus
4.5 4.64.2
Eth/0
PPP/0
Figure 17. Example of Exclusive Access Control
Using DNA IV
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MRS V3.2 Protocol Config Ref Vol 2
