Cisco IOS Cookbook, 2nd Edition

Finding Types of IP Routes

Problem

You want to look for a particular type of route in your router’s routing tables.

Solution

Often you are more interested in finding all of the directly connected networks, or all of the static routes, rather than in finding a specific route. This is found easily by specifying the type of route in the show command:

Router>show ip route connected
     192.168.17.0/27 is subnetted, 1 subnets
C       192.168.17.0 is directly connected, Loopback1
     172.16.0.0/30 is subnetted, 1 subnets
C       172.16.1.0 is directly connected, Async1
     172.25.0.0/16 is variably subnetted, 6 subnets, 3 masks
C       172.25.25.0/30 is directly connected, Tunnel0
C       172.25.1.0/24 is directly connected, Ethernet0
C       172.25.9.0/24 is directly connected, Ethernet1
C       172.25.10.1/32 is directly connected, Loopback0

Router>show ip route static
     192.168.1.0/32 is subnetted, 1 subnets
S       192.168.1.1 [1/0] via 172.25.1.4

And another useful variant of the show ip route command summarizes all of the different types of routes in the table:

Router>show ip route summary
IP routing table name is Default-IP-Routing-Table(0)
Route Source    Networks    Subnets     Overhead    Memory (bytes)
connected       0           3           328         432
static          1           0           64          144
ospf 55         1           3           256         576
  Intra-area: 1 Inter-area: 2 External-1: 1 External-2: 0
  NSSA External-1: 0 NSSA External-2: 0
internal        2                                   2328
Total           4           6           648         3480

Discussion

You can see the full list of possibilities by using a ? on the command line:

Router>show ip route ? Hostname or A.B.C.D Network to display information about ...