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

IPv6 Unicast Commands

configure iproute add blackhole

configure iproute add blackhole [<ipv6Netmask>] {vr <vrname>} {multicast-
only | unicast-only}
Description
Adds a blackhole address to the routing table. All traffic destined for a configured blackhole IP address
is silently dropped.
Syntax Description
ipv6Netmask
vrname
multicast-only
unicast-only
Default
If you do not specify a virtual router, the current virtual router context is used.
Usage Guidelines
A blackhole entry directs packets with a matching specified address prefix to be discarded. Blackhole
entries are useful as a security measure or in special circumstances where a specific destination address
must be discarded. Blackhole entries are treated like permanent entries in the event of a switch reset or
power off/on cycle. Blackhole entries are never aged out of the forwarding database (FDB).
The packets are silently discarded. In other words, no ICMP message is sent to indicate that the packets
are discarded.
Example
The following command causes packets with a destination address of 2001:db8::3452 to be silently
discarded:
configure iproute add blackhole 2001:db8::3452/128
History
This command was first available in ExtremeWare XOS 10.1.
Support for IPv6 was added in ExtremeWare XOS 11.2.
Platform Availability
This command is available on all platforms.
1164
Specifies an IPv6 address/prefix length.
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