System information

Configuring BGP
12-55
In Figure 12-19, Router Boston advertises network 150.60.0.0 in AS 400 with an
AS-path of 100. When the BGP route arrives in AS 400, Router Los Angeles adds its
AS number. When the BGP route arrives at Router New York, its AS_path attribute
contains AS numbers 400 and 100.
Figure 12-19 The AS-path Attribute
Configuring the MED Attribute
The MED attribute carries a metric expressing a degree of preference for a particular
route. By default, the BSR compares MED attributes for paths from external
neighbors only that are in the same AS.
Boston
NY
AS 300
192.55.0.0
AS 100
150.60.0
3.3.3.2
AS 400
192.56.0.0
LA