Which BGP option is required when load sharing overmultiple equal-bandwidth parallel
links from a single CE router to a single ISP router over eBGP? Select the best response.
A.
eBGP Multipath
B.
eBGP Multihop
C.
BGP Synchronization
D.
Public AS numbers
Explanation:
The eBGP multihop allows a neighbor connection between two external peers that do not
have direct connection. The multihop is only for eBGP and not for iBGP. For example, in the
topology below router A wants to establish neighborrelationship with the loopback0 of
router B (to allow load balancing), which does not have direct connection so it must use
“ebgp-multihop”
For your reference, the full configurations of bothrouter A & B are shown below:
Note: If router B wants to establish neighbor relationship with the directly connected
interface of router A, it only needs these commands:
But notice the traffic from router B would be sent to 172.16.10.2 interface only and load
balancing would not take place.
(Reference:http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800c95bb.shtml)
