Hi!
I have implemented RTBH in my small network of 8 routers. DFZ is running in
a L3VPN and each router has an multihop ibgp-session with my RTBH-router
and it works, but I have one thing that annoys me.
If I announce an offending IP to be black holed, only one of the routers
will point to the discard route. The other 7 will see the announced route
via BGP från the one that got it first I guess and send the traffic to that
one where is is discarded. If I do show extensive on the route it is prefer
because of IGP. I can't figure out how to get each router to prefer the
discard localy. If I do local pref on one router the other 7 will send the
traffic there instead.
Every router has
route a.b.c.d/32 {
discard;
install;
}
And from sending RTBH router, they are announced with next-hop a.b.c.d.
Idéas? :)
Regards
Johan
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