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  • Eiji Tanioka thinks this is interesting:

One problem with the alternate ASN being prepended when receiving the routes is that other iBGP peers will drop the network prefixes as part of a routing loop detection


Cover of IP Routing on Cisco IOS, IOS XE, and IOS XR: An Essential Guide to Understanding and Implementing IP Routing Protocols


only use "neighbor local-as" causes routing-loop to iBGP peer in Real-ASN.