11-30-2017 07:02 PM - edited 03-05-2019 09:34 AM
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
Solved! Go to Solution.
12-01-2017 11:50 AM - edited 12-01-2017 11:51 AM
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
11-30-2017 07:48 PM - edited 11-30-2017 07:56 PM
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.
:-)
11-30-2017 07:57 PM - edited 11-30-2017 08:02 PM
Opps my bad. I did configure correctly :) Both virtual IP is 192.168.0.252
Updated Configuration Info.
11-30-2017 08:24 PM - edited 11-30-2017 08:26 PM
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.
:-)
12-01-2017 11:50 AM - edited 12-01-2017 11:51 AM
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
12-01-2017 06:51 PM - edited 12-01-2017 06:52 PM
Thank you very much! Perfect Explanation :)
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