Hi, Somebody on IRC wanted to redistribute a route on a specific interface only. I call this "selective redistribute". Since the solution is non-trivial, it might be interesting to others.
The "if" selector of the redistribute filter doesn't fulfil that purpose: it only serves to match kernel routes by the interface they refer to (e.g. "default via XXX **dev eth0**" will match a "if eth0" selector). The solution is to redistribute the route, and apply output filters. This example redistributes the default route on br0 only: redistribute ip 0.0.0.0/0 le 0 metric 128 out ip 0.0.0.0/0 le 0 if br0 allow out ip 0.0.0.0/0 le 0 deny Do note that the output filters will *also* filter out routes that are not originated from us. I'm not sure whether this is a desirable behaviour: one might want to selectively redistribute a given prefix, but still advertise more specific routes (learnt elsewhere) on all interfaces. In any case, a hackish fix is to precisely match the routes one wants to redistribute selectively (e.g. using the "eq" selector). A proper fix would be to match our own router-id using the "id" selector, but it's definitely not convenient. It's even worse with a random router-id. Another solution would be to use the "neigh" selector, but it probably won't match routes originated locally. Any thoughts on this? Baptiste
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