RIP Version 2 Routing Table & DHCP Question :)

[Iluvnetwork]

R3# show ip route

1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

R 1.0.0.0/8 is possibly down, routing via 1.1.1.2, Serial0/0

C 1.1.1.0/24 is directly connected, Serial0/0

3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

R 3.0.0.0/8 [120/1] via 192.168.0.253, 00:02:31,

FastEthernet0/0

R 3.3.3.0/24 [120/1] via 192.168.0.253, 00:00:21,

FastEthernet0/0

C 192.168.0.0/24 is directly connected, FastEthernet0/0

R 200.0.0.0/24 [120/1] via 1.1.1.2, 00:00:16, Serial0/0

After 1min or few sec,

1.0.0.0/24 is subnetted, 1 subnets

C 1.1.1.0 is directly connected, Serial0/0

3.0.0.0/24 is subnetted, 1 subnets

R 3.3.3.0 [120/1] via 192.168.0.253, 00:00:23, FastEthernet0/0

C 192.168.0.0/24 is directly connected, FastEthernet0/0

R 200.0.0.0/24 [120/1] via 1.1.1.2, 00:00:21, Serial0/0

After rip routing (Version 2 + no auto-summary), I was expecting to see two C and two R. However, as you can see, 6 lines routing table was made somehow. After few seconds or 1 min, 6 lines routing table became as I expected. Can anyone explain to me why the routing table was 6 lines instead of 4 lines at the beginning?

I configured DHCP setting on both active and standby. Is there anyway that the active router sends the DHCP configuration to the standby router?

Router 4's Configuration

Router(config)#do show

show

% Incomplete command.

Router(config)#do show run

Building configuration...

Current configuration : 696 bytes

!

version 12.2

no service timestamps log datetime msec

no service timestamps debug datetime msec

no service password-encryption

!

hostname Router

!

!

!

!

!

ip dhcp pool test

network 200.0.0.0 255.255.255.0

default-router 200.0.0.254

!

!

!

no ip cef

no ipv6 cef

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

interface FastEthernet0/0

ip address 200.0.0.253 255.255.255.0

duplex auto

speed auto

standby 0 ip 200.0.0.254

standby priority 255

!

interface Serial0/0

bandwidth 64

ip address 1.1.1.2 255.255.255.0

!

router rip

version 2

network 1.0.0.0

network 200.0.0.0

no auto-summary

!

ip classless

!

ip flow-export version 9

!

!

!

!

!

!

!

line con 0

!

line aux 0

!

line vty 0 4

login

!

!

!

end

[Julio E. Moisa]

Hi

Based on your topology and IP plan the HSRP on the left side is not configured properly they (Router 1 and 3) have different HSRP virtual IP, is that information right? otherwise please share the config into a notepad. 

:-)

[Iluvnetwork]

Opps my bad. I did configure correctly :) Both virtual IP is 192.168.0.252

Updated Configuration Info. 

[Julio E. Moisa]

Hi,

That is ok, I see the following message: possibly down:

R 1.0.0.0/8 is possibly down, routing via 1.1.1.2, Serial0/0

C 1.1.1.0/24 is directly connected, Serial0/0

3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

R 3.0.0.0/8 [120/1] via 192.168.0.253, 00:02:31,

It can indicate a poisoning route was received, when during the hold down timer is being processed and if an update with valid information about a recovered network it will be restablished. The poisoning route is used to avoid loops on distance vector routing protocols. 

:-)

[paul driver · Accepted solution]

Hello

What you are seeing is due to the disablement of auto summerization and rip ver 2 being applied and as such the classful network 1.0.0.0/8 which was being advertised will now be re advertised with its correct subnet mask 1.1.1.0/24.

The old 1.0.0.0/8 route ( as you have posted) will eventually timeout thorough the RIP protocol invalid and holddown timers.(unless you manually clear the route table)

res

Paul

[Iluvnetwork]

Thank you very much! Perfect Explanation :)