IGP distribute list

FIGURE 1 0 . 2
IGP distribute list
That’ll do it. The distribute list that we have put in place will block the necessary routes from
being advertised.
Route Maps
Route maps for IGPs allow you to filter and/or manipulate routes during redistribution or policybased
routing. Because policy-based routing and redistribution are covered in detail later in this
chapter, we’re just going to have a quick review of route maps.
Route maps are broken up into sequences. Each sequence has its own conditions. If the
sequence of a route map is permit and the condition laid forth in the
match
statement is met,
the sequence can apply the conditions in the
set
statements. The
set
statements allow the user
to specify what actions to perform on any route that has met the condition in the
match
statement.
If the sequence is of type deny, no
set
statements will be able to be used.
Remember: A list of
match
statements in a sequence has an implicit
deny
all at
the end of it.
By using sequences, you’re able to manipulate the route map without having to delete it and
reconfigure the modified route map.
192.168.100.0 /24
.1
.1
.1
.1
.1
.1
.1
.2
.2
S0
S0
S0
S1
E1
E1
E0
E0
E0
192.168.50.0 /24
10.10.10.0 /30
20.20.20.0 /30
EIGRP AS 100
R2
R3
192.168.24.0 /24
192.168.88.0 /24
192.168.200.0 /24
R1
328 Chapter 10  Route Optimization
You cannot directly use a route map as you can with BGP. BGP allows you to attach a route
map to a BGP session for filtering and/or manipulation of the routing information passing over
the session. IGPs do not allow you to do this. You must use a route map with either redistribution
or policy-based routing.