Refer to the exhibit.
The customer has reported an issue about eBGP loading. Currently the AS 100 eBGP links have
an average outbound load of 65% and 20% respectively. On further investigation, traffic from
10.10.24.0 accounts for 45%, and 10.10.25.0 and 10.10.32.0 accounts for 20% each of the
outbound load. The customer wants to spread the load between the two eBGP links more evenly.
The BGP attributes are currently set at their default values. If you are located at AS 100 and want
to influence how AS 100 sends traffic to AS 200, what BGP attribute would you configure to cause
AS 100 outbound traffic to load the eBGP links more evenly?
A.
On router A, set the default local-preference to 50.
B.
On router B, set the default metric to 150.
C.
On router B, configure a route map for 10.10.25.0/24 that sets the local preference to 150.
D.
On router B, set the default local-preference to 150.
Explanation:
To make the eBGP links more evenly we should use the link B-F for network 10.10.25.0/24 so that
the total traffic going through B-F link is about 40%. In this case we should apply a route map on B
to set the local preference of 10.10.25.0/24 to a higher value than 100. But notice that we must
use a second clause to permit other traffic if not they will be filtered out.
Note: The default value for local preference is 100. A path with higher local preference is
preferred.