|
Note: Click on topology to view command
outputs.
In the example, RTF has picked the
direct path via AS1 to reach 192.68.11.0/24 because it is shorter.
The following configuration shows how the AS_path information can be
manipulated to make the AS_path longer by prepending AS path
numbers. We will prepend two extra AS path numbers to the AS_path
information sent from RTC to RTA to change the RTF decision about
reaching 192.68.11.0/24.
The preceding configuration prepends
two additional AS_path numbers, 1 and 1, to the AS_path information
sent from RTC to RTA. If you look at RTF's BGP table, you will see
that RTF can now reach 192.68.11.0/24 via next-hop 192.68.5.2 --
that
is, via path 2 1. RTF will prefer this path because it is shorter
than the direct path via AS1, which has a path information of 1 1 1.
|