Create a black hole static route to the destination that a router advertises to avoid
routing loops when aggregating or injecting routes to other routers.
Before you begin
To perform this procedure on a non-default VRF, you must first
change the VRF instance. For information about how to use EDM for a non-default VRF,
see Select and Launch a VRF Context View. All parameters might
not be available in non-default VRFs.
About this task
If an existing black hole route is enabled, you must first delete or disable it
before you can add a regular static route to that destination.
Note
Only black hole routes that belong to the static type protocol are
supported. An inter-VRF black hole route is not installed in the routing table of
the destination VRF on the same switch.
Procedure
-
In the navigation tree, expand
the following folders: .
-
Select IP.
-
Select the Static Routes
tab.
-
Select Insert.
-
In the OwnerVrfId check
box, select the appropriate VRF ID.
-
In the Dest field, enter
the IP address.
-
In the Mask field, enter
the network mask.
-
In the NextHop field,
type 255.255.255.255.
To create a black hole static route, you must configure the NextHop address
to 255.255.255.255.
-
Select the enable
option.
-
In the Metric box, type
the HopOrMetric value.
-
In the Preference check
box, select the route preference.
When you specify a route preference, be sure to appropriately configure the
preference so that when the black hole route is used, it is elected as the
best route.
-
Select Insert.
