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Table 207: Forwarding Table Fields
Option
Comment
None
indirect-next-hop
no-indirect-next-hop
Unicast Reverse Path
Export
Configuring Generated Routes (NSM Procedure)
Copyright © 2010, Juniper Networks, Inc.
Function
Specifies the comment for the
forwarding table.
Specifies that no next- hop parameter
is to be added to the forwarding table.
Specifies that the forwarding table
supports indirectly connected next hops.
Specifies that the forwarding table does
not support indirectly connected next
hops.
Enables you to check path validity to
protect the network from IP spoofing. A
unicast reverse-path-forwarding (RPF)
check performs a routing table lookup
on an IP packet's source address and
checks the incoming interface. The
device determines whether the packet
is arriving from a path that the sender
would use to reach the destination. If the
packet is from a valid path, the device
forwards the packet to the destination
address. If it is not from a valid path, the
device discards the packet.
Enables you to apply one or more
policies to routes being exported from
the routing table into the forwarding
table.
Generated routes are used as routes of last resort. A packet is forwarded to the route of
last resort when the routing tables have no information about how to reach that packet's
destination. One use of route generation is to create a default route to use if the routing
table contains a route from a peer on a neighboring backbone network. A generated route
becomes active when it has one or more contributing routes. A contributing route is an
active route that is a specific match for the generated destination.
For example, for the destination
are contributing routes, but routes to
128.100.67.0/24
are not. A route can contribute only to a single generated route. However,
128.100.0.0/16
an active generated route can recursively contribute to a less specific matching generated
route. For example, a generated route to the destination
to a generated route to
128.96.0.0/13
the routing table, the next hop device selects from the primary contributing route.
To configure generated routes in NSM:
Chapter 21: Configuring Routing Options
Your Action
Enter a comment.
Select the option button.
Select the option button to enable
indirect-next- hop
Select the option button to enable
no-indirect-next- hop
Select the path from the drop-down list.
1.
Expand the
and select
2. Enter the export policies.
128.100.0.0/16
, routes to
128.100.192.0/19
128.0.0.0./8
128.100.0.0/16
. By default, when generated routes are installed in
.
.
Forwarding Table
tree
.
Export
and
,
, and
128.0.0.0/16
can contribute
369
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