Question 570
A provider L3VPN design uses identical route distinguishers for two sites. Observed: Operators expect the RD itself to enforce customer route isolation. Which acceptance observation best confirms that the proposed change worked?
Explanation
Correct Answer
This acceptance criterion tests the actual fault. The source evidence was Operators expect the RD itself to enforce customer route isolation. The correction addresses a route distinguisher provides nlri uniqueness, not import-policy membership; success requires customer isolation follows the configured RT membership even where IPv4 prefixes overlap.
Incorrect Answers
This result is useful in another case with evidence Customer multicast control signaling exists but payload delivery fails at a remote PE. It does not test recovery from operators expect the rd itself to enforce customer route isolation. Check instead whether customer isolation follows the configured RT membership even where IPv4 prefixes overlap.
It confirms an unrelated service correction: The VPN BGP next hop lacks a resolvable MPLS labeled transport path. The present case reports Operators expect the RD itself to enforce customer route isolation. Its completion test is Customer isolation follows the configured RT membership even where IPv4 prefixes overlap.
That observation would verify a separate fault involving broad rt import/export policy exposed the default across unrelated vpns. Its symptom is One customer's default route is accidentally propagated to every tenant. For this case the actual issue is a route distinguisher provides nlri uniqueness, not import-policy membership, and the relevant success signal is Customer isolation follows the configured RT membership even where IPv4 prefixes overlap.