Specifications

show ip route
MP-499
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
Specific Route Information
When you specify that you want information about a specific network displayed, more detailed statistics
are shown. The following is sample output from the show ip route command when entered with the
IP address 10.0.0.1:
Router# show ip route 10.0.0.1
Routing entry for 10.0.0.1/32
Known via “isis”, distance 115, metric 20, type level-1
Redistributing via isis
Last update from 10.191.255.251 on Fddi1/0, 00:00:13 ago
Routing Descriptor Blocks:
* 10.22.22.2, from 10.191.255.247, via Serial2/3
Route metric is 20, traffic share count is 1
10.191.255.251, from 10.191.255.247, via Fddi1/0
Route metric is 20, traffic share count is 1
When an IS-IS router advertises its link-state information, it includes one of its own IP addresses to be
used as the originator IP address. When other routers calculate IP routes, they can store the originator IP
address with each route in the routing table.
The example above shows the output from the show ip
route command when looking at an IP route
generated by IS-IS. Each path that is shown under the Routing Descriptor Blocks report displays two IP
addresses. The first address (10.22.22.2) is the next hop address. The second is the originator IP address
from the advertising IS-IS router. This address helps you determine where a particular IP route has
originated in your network. In the example the route to 10.0.0.1/32 was originated by a router with IP
address 10.191.255.247.
Table 46 d
escribes the significant fields shown when using the show ip route command with an IP
address.
0:01:00 Specifies the last time the route was updated (in hours:minutes:seconds).
Ethernet2 Specifies the interface through which the specified network can be reached.
Table 45 show ip route Field Descriptions (continued)
Field Description
Ta b l e 46 show ip route with IP Address Field Descriptions
Field Description
Routing entry for 10.0.0.1/32 Network number and mask.
Known via... Indicates how the route was derived.
Tag Integer that is used to implement the route.
type Indicates the IS-IS route type (Level 1 or Level 2).
Redistributing via... Indicates the redistribution protocol.
Last update from 10.191.255.251 Indicates the IP address of a router that is the next hop to the
r
emote network and the router interface on which the last
update arrived.
Routing Descriptor Blocks: Displays the next hop IP address followed by the information
sour
ce.
Route metric This value is the best metric for this routing descriptor block.
traffic share count Number of uses for this routing descriptor block.