Network Command Issue
Figure - 1
In Figure - 1 I am going to use these two router R1 and R2. I have configured on both RIPv2, According to Figure-1 R1 is supposed to learn about 172.16.0.0/24 but look at the output there is no 172.16.0.0/24 .
R1#sh 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 not set
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, FastEthernet0/1
C 192.168.20.0/24 is directly connected, FastEthernet0/0
If you will notice in above output then you will find two directly connected route, 192.168.20.0 for R2 router and 10.1.1.0 for PC1, but there is no any RIP route with network 172.16.10.0 for PC2.
Note ;- You can also use Show ip route rip command to check this, Show ip route rip command only display the RIP route information.
R1#sh 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 not set
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, FastEthernet0/1
C 192.168.20.0/24 is directly connected, FastEthernet0/0
If you will notice in above output then you will find two directly connected route, 192.168.20.0 for R2 router and 10.1.1.0 for PC1, but there is no any RIP route with network 172.16.10.0 for PC2.
Note ;- You can also use Show ip route rip command to check this, Show ip route rip command only display the RIP route information.
So now let's check what is problem
R1#Show ip protocol
Routing Protocol is "rip"
Sending updates every 30 seconds, next due in 4 seconds
Invalid after 180 seconds, hold down 180, flushed after 240
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Redistributing: rip
Default version control: send version 2, receive 2
Interface Send Recv Triggered RIP Key-chain
FastEthernet0/1 2 2
Automatic network summarization is in effect
Maximum path: 4
Routing for Networks:
10.0.0.0
192.168.30.0 ........................................................ INCORRECT NETWORK
Passive Interface(s):
Routing Information Sources:
Gateway Distance Last Update
192.168.20.2 120 00:00:55
Distance: (default is 120)
R2#Show ip protocol
Routing Protocol is "rip"
Sending updates every 30 seconds, next due in 22 seconds
Invalid after 180 seconds, hold down 180, flushed after 240
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Redistributing: rip
Default version control: send version 2, receive 2
Interface Send Recv Triggered RIP Key-chain
FastEthernet0/0 2 2
FastEthernet0/1 2 2
Automatic network summarization is in effect
Maximum path: 4
Routing for Networks:
172.16.0.0
192.168.20.0
Passive Interface(s):
Routing Information Sources:
Gateway Distance Last Update
192.168.20.1 120 00:05:01
Distance: (default is 120)
RIPv2 has been enabled on both router, but take a close look at the "Show ip protocol" output of the R1. R1 has an incorrect network 192.168.30.0/24.
Let's fix it.
R1#config t
R1(config)#router rip
R1(config-router)#version 2
R1(config-router)#no network 192.168.30.0
R1(config-router)#network 192.168.20.0 .........................CORRECT NETWORK COMMAND
Now check
R1#sh 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 not set
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, FastEthernet0/1
R 172.16.0.0/16 [120/1] via 192.168.20.2, 00:00:25, FastEthernet0/0 .......... SEE THIS
C 192.168.20.0/24 is directly connected, FastEthernet0/0
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 not set
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, FastEthernet0/1
R 172.16.0.0/16 [120/1] via 192.168.20.2, 00:00:25, FastEthernet0/0 .......... SEE THIS
C 192.168.20.0/24 is directly connected, FastEthernet0/0
Now problem has been solved, so make sure the correct network command has been used..
Other Posts:-
OSI LAYERS AND FUNCTIONS
OSI LAYERS AND FUNCTIONS
IP ROUTING BASIC
IP ROUTING SCENARIOS
RIP BASIC
RIP TROUBLESHOOTING
NETWORK COMMAND ISSUE
INTERFACE ISSUE
VERSION MISMATCH ISSUE
PASSIVE INTERFACE ISSUE
MAXIMUM HOP COUNT ISSUE
RIP OFFSET LIST CONFIGURATION
BGP - INTERVIEW QUESTIONS (Part - 1)
LAYER-2 SWITCHING
Hello and welcome to networktopic Blog. My name is Anubhav. I am a Senior Network Egineer. I have created this blog specially to serve interview questions and answer on Network Routing and Switching, I will try my best to serve correct and updated networking knowledge for you as per my corporate experience.
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