Information Technology Reference
In-Depth Information
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, 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 0.0.0.0 to network 0.0.0.0
172.30.0.0/24 is subnetted, 3 subnets
C 172.30.2.0 is directly connected, Serial0/0/0
C 172.30.3.0 is directly connected, FastEthernet0/0
R 172.30.1.0 [120/1] via 172.30.2.1, 00:00:16, Serial0/0/0
192.168.4.0/30 is subnetted, 1 subnets
C 192.168.4.8 is directly connected, Serial0/0/1
S* 0.0.0.0/0 is directly connected, Serial0/0/1
Note:
Notice that R2 now has a static route tagged as a
candidate default
.
R1#
show 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, 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 172.30.2.2 to network 0.0.0.0
172.30.0.0/24 is subnetted, 3 subnets
C 172.30.2.0 is directly connected, Serial0/0/0
R 172.30.3.0 [120/1] via 172.30.2.2, 00:00:05, Serial0/0/0
C 172.30.1.0 is directly connected, FastEthernet0/0
R* 0.0.0.0/0 [120/1] via 172.30.2.2, 00:00:19, Serial0/0/0
Notice that R1 now has a RIP route tagged as a
candidate default
route. The route is the
“quad-zero” default route sent by R2. R1 will now send default traffic to the
Gateway of
last resort
at 172.30.2.2, which is the IP address of R2.
View the RIP updates that are sent and received on R1 with the
debug ip rip
command.
Step 2.
R1#
debug ip rip
RIP protocol debugging is on
RIP: sending v1 update to 255.255.255.255 via Serial0/0/0 (172.30.2.1)
RIP: build update entries
network 172.30.1.0 metric 1
RIP: received v1 update from 172.30.2.2 on Serial0/0/0
0.0.0.0 in 1 hops
172.30.3.0 in 1 hops
Notice that R1 is receiving the default route from R2.
