chrisp @
optimation .
co .
nz (Chris Palmer) writes:
> For any (Cisco) routers that have a default route, I always setup static
> routes to Null0 for any nets that are normally directly connected. When the
> interface is up, the connected route overrides the null route. Easy way to
> stop traffic going out the default route when the proper one isn't there. Also
> works in various subnetting situations.
> (NB. I've only tried this with statically routed configs. I don't know what
> the implications might be when running various routing protocols!).
Done it with gated (running RIP-2) on both Linux (1.2.13) and FreeBSD
(2.1.0). You add passive routes with a high metric to the down
interface (FreeBSD) or reject routes with high metric (Linux). When
the real routes are up and have a lower metric, they are used instead.
Sorry I don't remember any more details, but it's more than a year ago
that I did it. And I don't have any more access to those systems.
Ben
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