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C H A P T E R 17 Access Policies
341
Route Map Operation
The entries in the route map are processed in the ascending order of
the sequence number. Within the entry, the match statements are
processed first. When the match operation is successful, the set and
goto statements within the entry are processed, and the action
associated with the entry is either applied, or the next entry is
processed. If the end of the route map is reached, it is implicitly
denied.
When there are multiple match statements, the primitive
match-
one
or match-all in the entry determines how many matches are
required for success.
When there are no match statements in an entry, the entry is
considered a successful match.
Route Map Example
Figure 17.8 shows a topology using route maps to filter or modify
routing information that is exchanged between the neighbors RTA
and RTB using BGP.
Figure 17.8: Route maps
480T_048R
AS 1111
RTA
10.0.0.1
Internet
AS 2222
RTB
10.0.0.2
3421
7865
11 12109
13 161514
87654321
161514131211109
Rx TxRx TxRx TxRx Tx
3421
7865
11 12109
13 161514
87654321
161514131211109
Rx TxRx TxRx TxRx Tx
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