Question 660
A PE deploys IPv6 VPN on a dual-stack customer service. Observed: IPv6 routes leak into the global IPv6 table instead of the tenant's inet6 VRF. Which ongoing validation gate would best detect a recurrence of this problem?
Explanation
Correct Answer
A useful regression gate tests whether global and tenant IPv6 RIBs remain separate and allowed customer routes work and alerts when iPv6 routes leak into the global IPv6 table instead of the tenant's inet6 VRF. This directly checks the technical weakness: The customer interface or routing family is associated with the wrong routing instance. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.
Incorrect Answers
It is valid for another service scenario but checks operators expect the rd itself to enforce customer route isolation. This case instead needs a gate for ipv6 routes leak into the global ipv6 table instead of the tenant's inet6 vrf and evidence that global and tenant IPv6 RIBs remain separate and allowed customer routes work.
The proposed control is tied to site-of-origin extended-community filtering is missing and can cause routing feedback, typically observed when both PEs advertise the same CE prefix with inconsistent site-of-origin tags. Here the target is the customer interface or routing family is associated with the wrong routing instance; monitor global and tenant IPv6 RIBs remain separate and allowed customer routes work.
This gate monitors a different failure, the configured interface belongs to the master instance instead of its customer vrf. It would not detect the current problem: IPv6 routes leak into the global IPv6 table instead of the tenant's inet6 VRF. The appropriate check requires global and tenant IPv6 RIBs remain separate and allowed customer routes work.