Routing Questions

Question: How does /ip route check-gateway work?

check-gateway sends pings every 10 seconds. if two successive pings fail, the gateway is considered dead.

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Question: How to blackhole a network?

There are two ways to blackhole a network. First, you can do this manually by adding a blackhole route to the routing table, for example, to blackhole a 10.0.0.0/8 network, issue the following command:

/ip route add dst-address=10.0.0.0/8 type=blackhole

Routing filters are the other mean to blackhole a network. To create a routing filter that automatically blackholes all prefixes in 10.0.0.0/8 in the BGP feed, issue the following command:

/routing filter add prefix=10.0.0.0/8 prefix-length=8-32 set-type=blackhole chain=myfilter

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Question: How to filter out the default route from outgoing BGP advertisements?

Assuming you have a static default route that is redistributed because redistribute-static parameter is set to yes, do the following:

/routing filter add chain=myfilter prefix=0.0.0.0/0 action=discard

Then set myfilter as the out-filter for BGP instance

/routing bgp instance set default out-filter=myfilter