10/10/2023 0 Comments Bgp blackhole![]() Reference the DCU classes in a firewall filter. To see which categories of packets are being discarded, use destinationĬlass usage (DCU), and associate a user-defined class with each null route community. To locate discard-eligible routes, you can use a route filter, an access list, or a BGP communityįor example, here is how you would use a route filter:Īn issue with using a single null route filter is visibility. To actually discard packets requires a routing policy attached to the BGP sessions. That the discard interface allows you to configure and assign filters to the interface forĬounting, logging, and sampling the traffic. The advantage of using a discard interface instead of using discard static routes is (unit 0), but you can configure multiple IP addresses on unit 0.ĭsc.0 up up inet 192.0.2.102 -> 192.0.2.101 A discard interface can have only one logical unit In this approach, the discard interface contains the next hop youĪre assigning to the null route routes. + = Active Route, - = Last Active, * = BothĪ V Destination P Prf Metric 1 Metric 2 Next hop AS pathĪnother strategy, which is the main focus of this example, is to use routing policyĪnd the discard interface. Inet.0: 3 destinations, 3 routes (3 active, 0 holddown, 0 hidden) Route 192.0.2.105/32 show route protocol static terse A discard static route uses the discard option. Static route for each next hop used for discard routes. One way to configure discard routing in Junos OS is to create a discard Should be discarded are identified as attacks to customers from peers or other customers,Īttacks from customers to peers or other customers, attack controllers, which are hosts providingĪttack instructions, and unallocated address spaces, known as bogons or invalid IP addresses.Īfter the attack attempt is identified, operators can put a configuration in place to The problematic routesĪre sometimes referred to as discard routes or black-holed routes. The requests are sent to a router that does not forward the packets. In a short period of time, the router simply discards the requests without forwarding them. ![]() In a short period of time from being sent to the same address. In discard routing, routers are configured with rules that disallow millions of requests
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