Adds a blackhole address to the routing table. All traffic destined for an unknown IPv6 destination is silently dropped.
| ipv6Netmask | Specifies an IPv6 address/prefix length. |
| vr_name | Specifies the VR or VRF to which the route is added. |
| multicast-only | Specifies only multicast traffic for the route. |
| unicast-only | Specifies only unicast traffic for the route. |
If you do not specify a VR or VRF, the current VR context is used.
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.
The packets are silently discarded. In other words, no ICMP (Internet Control Message Protocol) message is sent to indicate that the packets are discarded.
The following example causes packets with a destination address of 2001:db8::3452 to be silently discarded:
configure iproute add blackhole 2001:db8::3452/128
This command was first available in ExtremeXOS 10.1.
Support for IPv6 was added in ExtremeXOS 11.2.
This command is available on the platforms listed for the IPv6 unicast routing feature in the ExtremeXOS 22.4 Feature License Requirements document.
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