BGP
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... ingress filtering, with the exception that the
access list is dynamic. This may also be used to avoid duplicate
configuration (e.g., maintaining both static routes or BGP prefix-
list filters ...
... edge is advertising multiple
prefixes using BGP. It makes for a simple, cheap, fast, and dynamic
filter.
...
... Forwarding Information
Base.
There are operational techniques, especially with BGP but somewhat
applicable to other routing protocols as well, to make strict RPF ...
... router, either a vendor-specific "weight" or a protocol distance to
prefer the directly received routes. With BGP and sufficient
machinery in place, setting the preferences could even be automated,
using BGP Communities ...
... BGP and sufficient
machinery in place, setting the preferences could even be automated,
using BGP Communities [2]. That way, the route will always be the
...
... routing-protocol specific methods, for example by including all or N
(where N is less than all) feasible BGP paths in the Routing
Information Base (RIB). Sometimes this method ...
... not hold e.g., in the case where a secondary ISP does not propagate
the BGP advertisement to the primary ISP e.g., due to route-maps or
...
... RPF check, as described in Section 4.1.
5. Ensure, by BGP or by contract, that each ISP's ingress filter is
...
... prefixes and exchange routes
with its ISPs with BGP, to ensure that its prefix is carried upstream
...
... Chandrasekeran, R., Traina, P. and T. Li, "BGP Communities Attribute", RFC 1997prop, August 1996. ...