Configure Iproute Add Blackhole Default - Extreme Networks ExtremeWare XOS Command Reference Manual

IP Unicast Commands

configure iproute add blackhole default

configure iproute add blackhole {ipv4} default {vr <vrname>} {multicast-
only | unicast-only}
Description
Adds a default blackhole route to the routing table. All traffic destined for an unknown IP destination is
silently dropped, and no Internet Control Message Protocol (ICMP) message is generated.
Syntax Description
vr_name
multicast-only
unicast-only
Default
If you do not specify a virtual router, the current virtual router context is used.
Usage Guidelines
While a default route is for forwarding traffic destined to an unknown IP destination, and a blackhole
route is for discarding traffic destined to a specified IP destination, a default blackhole route is for
discarding traffic to the unknown IP destination.
Using this command, all traffic with an unknown destination is discarded.
The default blackhole route is treated like a permanent entry in the event of a switch reset or power
off/on cycle. The default blackhole route's origin is "b" or "blackhole" and the gateway IP address for
this route is 0.0.0.0.
Example
The following command adds a blackhole default route into the routing table:
configure iproute add blackhole default
History
This command was first available in ExtremeWare XOS 10.1.
The ipv4 keyword was added in ExtremeWare XOS 11.2.
Platform Availability
This command is available on all platforms.
1086
Specifies the virtual router to which the route is added.
Specifies only multicast traffic for the route.
Specifies only unicast traffic for the route.
ExtremeWare XOS 11.3 Command Reference