RIP with 176.16.X.X

[Laith_IQ]

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?

[acampbell]

Sounds like you are set for classful routing.
Can you try adding to your global config

ip classless

[Laith_IQ]

thanks for the feedback

!
!
!
Router(config)#no ip classless
^
% Invalid input detected at '^' marker.

[cofee]

Can you confirm if you are using RIP version 2?

router rip

version 2

!

[Laith_IQ]

thanks for the feedback.
i tried v1 & v2 ...the same result

[Laith_IQ]

thanks for the feedback.
im always triad v1 & v2 ...the same result

[Joseph W. Doherty]

I recall (?) Cisco's RIP, including Cisco's RIPv2, does classful summerization by default. I also recall (?) I didn't find a way to override this.

[Rolf Fischer]

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

[Laith_IQ]

Router(config)#router rip
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)

[Rolf Fischer]

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.

[Laith_IQ]

Router(config)#no router rip
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#

[Rolf Fischer]

Is there something you want to tell us?

[Laith_IQ]

Yes, the no auto- summery didn't change the situation.

[Rolf Fischer]

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?

[paul driver · Accepted solution]

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