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?
Solved! Go to Solution.
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
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
06-12-2018 09:37 AM
06-13-2018 12:57 AM
06-12-2018 10:58 AM
Can you confirm if you are using RIP version 2?
router rip
version 2
!
06-13-2018 12:58 AM
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
06-12-2018 11:07 AM
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
06-13-2018 01:19 AM
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.
06-13-2018 06:00 AM
06-13-2018 06:05 AM - edited 06-13-2018 06:06 AM
Is there something you want to tell us?
06-13-2018 09:29 AM
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?
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
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