On the BGP/MPLS IP VPN network shown in the figure, which of the following RT settings can enable Site1 and Site2 to communicate with Site3 but prevent Site1 and Site2 from communicating with each other?
Route Targets (RTs) are BGP extended communities that control the import and export of VPNv4 routes between VPN instances.
A PE exports routes with its configured Export RT (ERT). A receiving PE imports those routes only when the advertised RT matches one of its Import RTs (IRTs).
In option A, PE1 and PE2 use different RTs, preventing direct route exchange. PE3 imports and exports both RTs, enabling communication with both sites.
In option C, PE1 and PE2 export RT 200:1 and import RT 100:1. PE3 exports RT 100:1 and imports RT 200:1. This creates communication between PE3 and both spokes without allowing direct communication between the spokes.
Options B and D permit route exchange between PE1 and PE2.
Therefore, A and C satisfy the requirements.
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Training Material.pdf
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