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06-12-2018 03:15 AM - edited 03-05-2019 10:34 AM
Hello,
see the exhibit please.
I have made a network with 3 routers, 3 sub-networks with
1- 176.16.0.0/24
2- 176.16.1.0/24
3. 176.16.2.0/24
and the routers networks
1- 10.10.10.0/30
2- 10.10.10.4/30
3- 10.10.10.8/30
I used RIP as a daynamic router protocol.
issue:
If i add network 176.16.1.0 & network 176.16.2.0 to the rip route then if i do a show to my ip route i see only the 176.16.0.0.
In other words: the router convert the networks 176.16.1.0 & 176.16.2.0 to 176.16.0.0 becaus they are according to the router a prive neworks 176.16.x.x/16.
if i change the ip range to 192.168.x.x/24 then i have aconnection , but i should use the other range of 176.16.X.X/24
any solution?
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06-13-2018 12:28 AM - edited 06-13-2018 11:42 PM
Hello
As others have stated rip is a class full protocol as such it will by default auto summarise into class-full networks(version 1-2) sowon’t take into account the hosts bit of the network which can cause issue if your spokes have networks with it this summary
in version 2 rip apply the -“No auto summary” under the rip process and then it should advertise the correct network
res
paul
Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.
Kind Regards
Paul
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06-14-2018 12:19 AM
Dear all,
I finally found it. this has to do with packet tracer.
1- I have turned off all the router
2-one is turned on then I do my configuration on this router.
3- then I start the 2nd ..etc.
however, the following config is executed on all routers.
router rip
version 2
netwwork x.x.x.x. (add your network)
netwwork x.x.x.x. (add your network)
no car-numbery
passive interface {interface name bv g0 / 0}
defualt -information originate
exit
exit
copy run st
thanks for the interesting answers
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06-12-2018 09:37 AM
Can you try adding to your global config
ip classless
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06-13-2018 12:57 AM
!
!
!
Router(config)#no ip classless
^
% Invalid input detected at '^' marker.
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06-12-2018 10:58 AM
Can you confirm if you are using RIP version 2?
router rip
version 2
!
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06-13-2018 12:58 AM
i tried v1 & v2 ...the same result
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06-13-2018 01:22 AM - edited 06-13-2018 09:24 AM
thanks for the feedback.
im always triad v1 & v2 ...the same result
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06-12-2018 11:07 AM
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06-13-2018 12:21 AM - edited 06-13-2018 12:28 AM
Hello,
Joseph is correct, even classless RIPv2 auto-summarizes "subprefixes to the classful network boundary when crossing classful network boundaries" by default (weird, I know...).
if i change the ip range to 192.168.x.x/24 then i have aconnection , (...)
This is because the /24 is already the classful network boundary for a class-C network. A 192.168.x.x/30 network, for instance, would also be auto-summarized to the /24 classful network boundary.
"no auto-summary" under the RIP processes should do the trick.
HTH
Rolf
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06-13-2018 01:19 AM
Router(config-router)#no au
Router(config-router)#no auto-summary
Router(config-router)#ne
Router(config-router)#network 10.10.10.0 255.255.255.252
^
% Invalid input detected at '^' marker.
Router(config-router)#network 10.10.10.0
Router(config-router)#network 10.10.10.8
Router(config-router)#network 176.16.2.0
Router(config-router)#exit
Router(config)#exit
Router#show ip prot
Router#show ip protocols
Routing Protocol is "rip"
Sending updates every 30 seconds, next due in 27 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 1, receive any version
Interface Send Recv Triggered RIP Key-chain
Serial0/0/0 1 2 1
Serial0/0/1 1 2 1
GigabitEthernet0/0 1 2 1
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
10.0.0.0
176.16.0.0
Passive Interface(s):
Routing Information Sources:
Gateway Distance Last Update
Distance: (default is 120)
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06-13-2018 05:22 AM
In RIP, the network commnad doesn't have a wildcard- or subnetmask option; this also applies to v2.
However, with auto-summary disabled, the router should now advertise the prefixes with the correct masks and you should no longer see classful summary routes.
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06-13-2018 06:00 AM
Router(config)#
Router(config)#
Router(config)#
Router(config)#ro
Router(config)#router r
Router(config)#router rip
Router(config-router)#aut
Router(config-router)#auto-summary dis
Router(config-router)#auto-summary ?
<cr>
Router(config-router)#no auto-summary
Router(config-router)#net
Router(config-router)#network 10.10.10.8
Router(config-router)#network 10.10.10.4
Router(config-router)#network 176.16.1.0
Router(config-router)#exit
Router(config)#exit
Router#
%SYS-5-CONFIG_I: Configured from console by console
Router#show ip pro
Router#show ip protocols
Routing Protocol is "rip"
Sending updates every 30 seconds, next due in 8 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 1, receive any version
Interface Send Recv Triggered RIP Key-chain
Serial0/0/0 1 2 1
Serial0/0/1 1 2 1
GigabitEthernet0/0 1 2 1
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
10.0.0.0
176.16.0.0
Passive Interface(s):
Routing Information Sources:
Gateway Distance Last Update
10.10.10.10 120 00:00:01
Distance: (default is 120)
Router#
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06-13-2018 06:05 AM - edited 06-13-2018 06:06 AM
Is there something you want to tell us?
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06-13-2018 09:29 AM
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06-13-2018 11:52 PM
Could you provide the "show ip route" output of the neighbor router(s) to show us the routes that are still auto-summarized to classful networks?
Or perhaps you could provide some clarification if I misunderstood the problem you're trying to fix?
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06-13-2018 12:28 AM - edited 06-13-2018 11:42 PM
Hello
As others have stated rip is a class full protocol as such it will by default auto summarise into class-full networks(version 1-2) sowon’t take into account the hosts bit of the network which can cause issue if your spokes have networks with it this summary
in version 2 rip apply the -“No auto summary” under the rip process and then it should advertise the correct network
res
paul
Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.
Kind Regards
Paul
