【单项选择题】
During BGP configuration on a router that has peered with other BGP speakers, the BGP command aggregate-a ddress 172.32.0.0 255.255.252.0 is issued. However, the peers do not receive this aggregate network in BGP advertisements. Also, the router does not have this aggregate network in its BGP table.<br /> Which option indicates a possible reason this command did not cause the router to advertise the aggregate network to its peers?（）<p> During BGP configuration on a router that has peered with other BGP speakers, the BGP command aggregate-a ddress 172.32.0.0 255.255.252.0 is issued. However, the peers do not receive this aggregate network in BGP advertisements. Also, the router does not have this aggregate network in its BGP table.<br /> Which option indicates a possible reason this command did not cause the router to advertise the aggregate network to its peers?（）</p>
A、A. Interface NULL 0 is likely shutdown.
B、B. The next hop IP address must be a loopback address.
C、C. The BGP command no auto - summary is missing.
D、D. The BGP command no synchronization is missing.
E、E. Subnets of 172.32.0.0/22 do not exist in the BGP table.
F、F. The IGP running on this router does not have network 172.32.0.0/22 installed.
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