Extreme Networks ExtremeWare 7.7, Command Reference Manual

Page: 1674 / 2620

1674 ExtremeWare 7.7 Command Reference Guide
IP Unicast Commands
configure iproute add blackhole default
configure iproute add blackhole default
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
This command has no arguments or variables.
Default
N/A
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. If there is another static
default route existing in the routing table, the
blackhole default
route takes higher route priority.
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 6.2.2.
This command was added to the “e” series of switches in ExtremeWare 7.2e.
Platform Availability
This command is available on all platforms.