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Network Warrior, 2nd Edition by Gary A. Donahue

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The IP Routing Table

To show the IP routing table, use the show ip route command:

R2#sho ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 11.0.0.1 to network 0.0.0.0

     172.16.0.0/16 is variably subnetted, 6 subnets, 2 masks
D       172.16.200.0/23 is a summary, 00:56:18, Null0
C       172.16.200.0/24 is directly connected, Loopback2
C       172.16.201.0/24 is directly connected, Serial0/0
C       172.16.202.0/24 is directly connected, Loopback3
C       172.16.100.0/23 is directly connected, Loopback4
D       172.16.101.0/24 [90/2172416] via 11.0.0.1, 00:53:07, FastEthernet0/1
C    10.0.0.0/8 is directly connected, FastEthernet0/0
C    11.0.0.0/8 is directly connected, FastEthernet0/1
     192.168.1.0/32 is subnetted, 1 subnets
D       192.168.1.11 [90/156160] via 11.0.0.1, 00:00:03, FastEthernet0/1
S*   0.0.0.0/0 [1/0] via 11.0.0.1
D    10.0.0.0/7 is a summary, 00:54:40, Null0

The first block of information is shown every time the command is executed. In the interest of brevity, I will remove it from most of the examples in this book. This block is a key that explains the codes listed down the left side of the routing ...

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