Traditional BGP loop detection mechanisms are unable to detect a loop in a VPRN scenario.

BGP loops are detected in a VPRN when the customer has separate sites using the same BGP autonomous system number.

The Alcatel-Lucent 7750 SR rejects routes containing AS_PATH loops by default.

When "remove-private" is configured at a PE, all routes received from the associated CE will have private AS numbers removed.