discard (routing-options)
Syntax
discard;
Hierarchy Level
[edit logical-systems logical-system-name routing-instances routing-instance-name routing-options (aggregate | generate) (defaults | route)], [edit logical-systems logical-system-name routing-instances routing-instance-name routing-options rib routing-table-name (aggregate | generate) (defaults | route)], [edit logical-systems logical-system-name routing-options (aggregate | generate) (defaults | route)], [edit logical-systems logical-system-name routing-options rib routing-table-name (aggregate | generate) (defaults | route)], [edit routing-instances routing-instance-name routing-options (aggregate | generate) (defaults | route)], [edit routing-instances routing-instance-name routing-options rib routing-table-name (aggregate | generate) (defaults | route)], [edit routing-options (aggregate | generate) (defaults | route)], [edit routing-options rib routing-table-name (aggregate | generate) (defaults | route)]
Description
Do not forward packets addressed to this destination. Instead, drop the packets, do not send ICMP unreachable messages to the packets’ originators, and install a reject route for this destination into the routing table.
To propagate static routes into the routing protocols, include
the discard statement when you define the route, along
with a routing policy.
In other vendors’ software, a common way to propagate static routes into routing protocols is to configure the routes so that the next-hop routing device is the loopback address (commonly, 127.0.0.1). However, configuring static routes in this way (by including a statement such as route address/mask-length next-hop 127.0.0.1) does not propagate the static routes, because the forwarding table ignores static routes whose next-hop routing device is the loopback address.
Default
When an aggregate route becomes active, it is installed in the routing table with a reject next hop, which means that ICMP unreachable messages are sent.
Required Privilege Level
routing—To view this statement in the configuration.
routing-control—To add this statement to the configuration.
Release Information
Statement introduced before Junos OS Release 7.4.