Discussion

*[Direct/0] 00:01:08
> via lo0.0
feee::10:255:71:4/128
*[Direct/0] 00:01:08
> via lo0.0
When the router is running IS-IS, the show route command lists entries in the ISO
routing table, iso.0, or you can view them separately with this command:
aviva@RouterA> show route table iso.0
iso.0: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
49.0020.1921.6804.2001/72
*[Direct/0] 13:16:30
> via lo0.0
Discussion
The show route command is the basic command for listing routes in the routing table.
The first command in this recipe, without any options, shows the contents of all the
routing tables that RPD is currently using. This output shows the contents of two
routing tables, inet.0, which is the default routing table for IPv4 unicast routes, and
__juniper_private1__, which is an internal routing table used by the JUNOS software.
If IPv6, IS-IS, multicast, or traffic engineering is configured on the router, the
show route command lists the routes in the routing tables used by these protocols,
including inet6.0, iso.0, inet.2, inet.3, and mpls.0.
The first two lines of the show route output summarize the entries in the inet.0 table:
inet.0: 5 destinations, 5 routes (5 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
This table has five routes. Of these, five are active, none are in the hold-down state
prior to being deleted from the routing table, and none are hidden as a result of a
configured routing policy.
The left column of the table shows the IP addresses of the routing entries. The direct
routes are those to the prefixes (subnetwork addresses) assigned to an interface on
the router. In the inet.0 table, you see three direct routes: two are to physical interface
subnetworks, 10.0.16.0/24 and 10.0.21.0/24, and one is to the router’s loopback
interface, 192.168.42.1/32. The local routes are the /32 interface addresses on
the directly connected interfaces, and there are two in the routing table, 10.0.16.1/32
and 10.0.21.1/32.
The right column of the output gives some details about each route. The asterisk (*)
indicates that the route is the active route, which is the route currently installed in
the forwarding table.
The text within the square brackets indicates how the route was learned and the
route’s preference value. All routes in the inet.0 table are either local on the router
or learned as a result of a direct network connection to a neighboring router. If a
252 | Chapter 8: IP Routing
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