Solved: RIP V2 PROBLEM

mariosomo9 · ‎03-08-2025

hello everyone.i have a rip v2 connection issue as i can identify ,i have 1 router in main town and 3 routers in other towns .every router is connected to a switch and the switch to devices . i also have intervlan for vlans to communicate between towns . i did the rip v2 for network 10.0.0.0 , the problem is that the packets send from the main routers devices only reach the router town interfaces but they cant go inside the other town networks ,i tried evrything and i think there is a rip v2 problem with routers. for example the pc 22f can reach only router lemesos fa0/0 . and the pc on the left side(u cantseeit) casn ping routerlemesos 0/0 router paphos 0/0 and larnaca0/0 but they cant join the local towns network , please help

liviu.gheorghe · ‎03-09-2025

If you keep the actual addressing schema. where VLAN 50 connected to router LEMESOS has the same configured subnet 10.1.5.0/26, the hosts connected to router LEMESOS will not be able to comunicate to the hosts in the same subnet 10.1.5.0/26 connected to router PAPHOS.

This is how IP communication works - if PC21F which has an IP of 10.1.5.22/26 wants to communicate with PC31F which has an IP of 10.1.5.32/26, sees from the IP address and mask combination that PC31F is on the same subnet as PC21F, so he broadcasts an ARP request to find out the MAC address of PC31F.

PC21F and PC31F are separated broadcast domains by the routers LEMESOS and PAPHOS, so the broadcast from PC21F will never reach PC31F, because the routers do not forward broadcasts, and PC21F will never find PC31F MAC address in order to communicate.

This is why VLAN50 attached to router LEMESOS should have an IP subnet different from VLAN50 attached to router PAPHOS and VLAN50 attached to FAMACA. For example you could have the same addresing schema for VLAN50:

Router main: 10.1.5.0/26

Router LEMESOS: 10.1.15.0/26

Router PAPHOS: 10.1.25.0/26

Router FAMACA: 10.1.45.0/26

This way the PC in VLAN50 attached to router LEMESOS belong to the same subnet 10.1.15.0/26 and can communicate with each other using the method I described earlier.

If PC21F wants to communicate with PC31F now, which has an IP of 10.1.15.32/26, sees from the IP address and mask combination that PC31F is on a different subnet as PC21F, sends an ARP request for the MAC address of PC31F and the router LEMESOS who has routing information of network 10.1.15.0/26 responds with his own MAC address and then PC21F sends the packet to the router which will deliver it to router PAPHOS and then to PC31F.

Regards, LG
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M02@rt37 · ‎03-08-2025

Hello @mariosomo9

Do you perform redistribution on RIP processes ?

Since routers host the SVIs, add "redistribute connected" commands on RIP process.

Best regards
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mariosomo9 · ‎03-08-2025

yes but still not work

rais · ‎03-08-2025

Are you doing IRB on 2911s?

mariosomo9 · ‎03-08-2025

i dhpuld not use this because im already using intervlans

liviu.gheorghe · ‎03-08-2025

Hello @mariosomo9 ,

is the topology hub and spoke with the hub, the router in main town, connecting to the other towns via a single interface?

If this is the case, then you should disable split horizon on the interface the main town router uses to reach the spoke routers; issue this command in interface configuration mode:

R1(config-if)#no ip split-horizon

HTH

Regards, LG
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mariosomo9 · ‎03-08-2025

ye main router connects with router limasol router paphos and router larnaca with interface main to lemesos 10.1.5.209 lemesos to main 10.1.5.210 and the other like this with subnet 255.255.255.252 and i did the command stil not work ,i tried retalry everyhing and no solution i find

liviu.gheorghe · ‎03-08-2025

Can you provide the configurations of the 4 routers involved?

Regards, LG
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mariosomo9 · ‎03-08-2025

FOR every router

routert rip

version 2

no auto-summary

network 10.0.0.0

ex

for the rip .......

liviu.gheorghe · ‎03-08-2025

And also interface configuration for the HUB and the spoke routers.

Regards, LG
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mariosomo9 · ‎03-08-2025

theere are too many i cand send you a screenshot iuf you want

liviu.gheorghe · ‎03-08-2025

Try show run | s interface

Regards, LG
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mariosomo9 · ‎03-08-2025

interface GigabitEthernet5/0
ip address 10.1.5.209 255.255.255.252
duplex auto
speed auto
interface GigabitEthernet6/0
ip address 10.1.5.213 255.255.255.252
duplex auto
speed auto
interface GigabitEthernet7/0
ip address 10.1.5.217 255.255.255.252
duplex auto
speed auto

this is for the interfaces that goes to towns

liviu.gheorghe · ‎03-09-2025

Please share show ip route rip from the main town router and also from the other routers in the remote towns.

Regards, LG
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mariosomo9 · ‎03-09-2025

main router always shows empty

router limassol :

10.0.0.0/8 is variably subnetted, 15 subnets, 6 masks

R 10.1.5.64/27 [120/1] via 10.1.5.209, 00:00:09, GigabitEthernet0/0

R 10.1.5.96/28 [120/1] via 10.1.5.209, 00:00:09, GigabitEthernet0/0

R 10.1.5.112/28 [120/1] via 10.1.5.209, 00:00:09, GigabitEthernet0/0

R 10.1.5.128/28 [120/1] via 10.1.5.209, 00:00:09, GigabitEthernet0/0

R 10.1.5.144/28 [120/1] via 10.1.5.209, 00:00:09, GigabitEthernet0/0

R 10.1.5.160/28 [120/1] via 10.1.5.209, 00:00:09, GigabitEthernet0/0

R 10.1.5.176/28 [120/1] via 10.1.5.209, 00:00:09, GigabitEthernet0/0

R 10.1.5.192/29 [120/1] via 10.1.5.209, 00:00:09, GigabitEthernet0/0

R 10.1.5.200/29 [120/1] via 10.1.5.209, 00:00:09, GigabitEthernet0/0

R 10.1.5.212/30 [120/1] via 10.1.5.209, 00:00:09, GigabitEthernet0/0

R 10.1.5.216/30 [120/1] via 10.1.5.209, 00:00:09, GigabitEthernet0/0

router paphos :

10.0.0.0/8 is variably subnetted, 15 subnets, 6 masks

R 10.1.5.64/27 [120/1] via 10.1.5.213, 00:00:09, GigabitEthernet0/0

R 10.1.5.96/28 [120/1] via 10.1.5.213, 00:00:09, GigabitEthernet0/0

R 10.1.5.112/28 [120/1] via 10.1.5.213, 00:00:09, GigabitEthernet0/0

R 10.1.5.128/28 [120/1] via 10.1.5.213, 00:00:09, GigabitEthernet0/0

R 10.1.5.144/28 [120/1] via 10.1.5.213, 00:00:09, GigabitEthernet0/0

R 10.1.5.160/28 [120/1] via 10.1.5.213, 00:00:09, GigabitEthernet0/0

R 10.1.5.176/28 [120/1] via 10.1.5.213, 00:00:09, GigabitEthernet0/0

R 10.1.5.192/29 [120/1] via 10.1.5.213, 00:00:09, GigabitEthernet0/0

R 10.1.5.200/29 [120/1] via 10.1.5.213, 00:00:09, GigabitEthernet0/0

R 10.1.5.208/30 [120/1] via 10.1.5.213, 00:00:09, GigabitEthernet0/0

R 10.1.5.216/30 [120/1] via 10.1.5.213, 00:00:09, GigabitEthernet0/0

router larnaca:

10.0.0.0/8 is variably subnetted, 14 subnets, 6 masks

R 10.1.5.0/26 [120/1] via 10.1.5.217, 00:00:06, GigabitEthernet0/0

R 10.1.5.64/27 [120/1] via 10.1.5.217, 00:00:06, GigabitEthernet0/0

R 10.1.5.96/28 [120/1] via 10.1.5.217, 00:00:06, GigabitEthernet0/0

R 10.1.5.112/28 [120/1] via 10.1.5.217, 00:00:06, GigabitEthernet0/0

R 10.1.5.128/28 [120/1] via 10.1.5.217, 00:00:06, GigabitEthernet0/0

R 10.1.5.144/28 [120/1] via 10.1.5.217, 00:00:06, GigabitEthernet0/0

R 10.1.5.160/28 [120/1] via 10.1.5.217, 00:00:06, GigabitEthernet0/0

R 10.1.5.176/28 [120/1] via 10.1.5.217, 00:00:06, GigabitEthernet0/0

R 10.1.5.192/29 [120/1] via 10.1.5.217, 00:00:06, GigabitEthernet0/0

R 10.1.5.200/29 [120/1] via 10.1.5.217, 00:00:06, GigabitEthernet0/0

R 10.1.5.208/30 [120/1] via 10.1.5.217, 00:00:06, GigabitEthernet0/0

R 10.1.5.212/30 [120/1] via 10.1.5.217, 00:00:06, GigabitEthernet0/0