Refer to the exhibit. A client has asked you to consult on an eBGP loading question.
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 linksmore 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 could 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 with a local preference of 150
linked to neighbor 192.168.30.2.
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 isabout 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.