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Ни Quagga ни BIRD не позволяют изменить next-hop в этом смысле.
A.4.5 AS-external-LSAs описывает Link State Advertisement от boundary router'ов, это наш случай. Forwarding address
Data traffic for the advertised destination will be forwarded to
this address. If the Forwarding address is set to 0.0.0.0, data
traffic will be forwarded instead to the LSA's originator (i.e.,
the responsible AS boundary router).
The "forwarding address" has one other application. It enables
routers in the Autonomous System's interior to function as
"route servers". For example, in Figure 2 the router RT6 could
become a route server, gaining external routing information
through a combination of static configuration and external
routing protocols. RT6 would then start advertising itself as
an AS boundary router, and would originate a collection of OSPF
AS-external-LSAs. In each AS-external-LSA, Router RT6 would
specify the correct Autonomous System exit point to use for the
destination through appropriate setting of the LSA's "forwarding
address" field.
Inter-AS routing. Можно ли сэкономить на BGP маршрутизаторе?