Refer to the exhibit.
The network administrator has configured the Customer Edge router (AS 64511) to send only summarized routes toward ISP -1 (AS 100) and ISP-2 (AS 200).
router bgp 64511
network 172.16.20.0 mask 255.255.255.0
network 172.16.21.0 mask 255.255.255.0
network 172.16.22.0 mask 255.255.255.0
network 172.16.23.0 mask 255.255.255.0
aggregate-address 172.16.20.0 255.255.252.0
After this configuration, ISP-1 and ISP-2 continue to receive the specific routes and the summary route.
Which configuration resolves the issue?
A . router bgp 64511
aggregate-address 172.16.20.0 255.255.252.0 summary-only
B . router bgp 64511
neighbor 192.168.100.1 summary-only
neighbor 192.168.200.2 summary-only
C . interface E0/0
ip bgp suppress-map BLOCK_SPECIFIC
!
interface E0/1
ip bgp suppress-map BLOCK_SPECIFIC
!
ip prefix-list PL_BLOCK_SPECIFIC
permit 172.16.20.0/22 ge 24
!
route-map BLOCK_SPECIFIC permit 10
match ip address prefix-list PL_BLOCK_SPECIFIC
D . ip prefix-list PL_BLOCK_SPECIFIC
deny 172.16.20.0/22 ge 22
ip prefix-list PL_BLOCK_SPECIFIC
permit 172.16.20.0/22
!
route-map BLOCK_SPECIFIC permit 10
match ip address prefix-list PL_BLOCK_SPECIFIC
!
router bgp 64511
aggregate-address 172.16.20.0 255 255.252.0 suppress-map BLOCK_SPECIFIC
Answer: A
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