Extreme Networks ExtremeWare XOS 11.0, Command Reference Manual

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618 ExtremeWare XOS 11.0 Command Reference Guide
IP Unicast Commands
configure iproute add blackhole default
configure iproute add blackhole 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
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 available in ExtremeWare XOS 10.1.
vr_name Specifies the virtual router to which the route is added.