Cant ping across Router

[kobe5934]

the switch that connects to router A
switch1

interface FastEthernet0/1

switchport trunk allowed vlan 10,20

switchport mode trunk

interface FastEthernet0/2

switchport trunk allowed vlan 10,20

switchport mode trunk

interface FastEthernet0/6

switchport trunk allowed vlan 10,20

switchport mode trunk

interface Vlan10

ip address 192.168.10.6 255.255.255.0

ip default-gateway 192.168.10.1

the switch that connect to router B

switch0(1)

hostname switch0(1)

interface FastEthernet0/1

switchport trunk allowed vlan 10,20

switchport mode trunk

interface FastEthernet0/2

switchport trunk allowed vlan 10,20

switchport mode trunk

interface FastEthernet0/5

switchport trunk allowed vlan 10,20

switchport mode trunk

interface Vlan20

ip address 192.168.20.7 255.255.255.0

ip default-gateway 192.168.20.1

router A

hostname RouterA

interface GigabitEthernet0/0

ip address 10.0.0.11 255.0.0.0

interface GigabitEthernet0/1

ip address 11.0.0.22 255.0.0.0

interface GigabitEthernet0/2

ip address 192.168.10.1 255.255.255.0

router ospf 1

log-adjacency-changes

network 192.168.10.0 0.0.0.255 area 0

network 10.0.0.0 0.255.255.255 area 0

network 11.0.0.0 0.255.255.255 area 0

router B

hostname RouterB

interface GigabitEthernet0/0
ip address 10.0.0.11 255.0.0.0

interface GigabitEthernet0/1
ip address 11.0.0.12 255.0.0.0
duplex auto
speed auto
!
interface GigabitEthernet0/2
ip address 192.168.20.1 255.255.255.0

interface FastEthernet0/0/3
switchport mode access
switchport nonegotiate

router ospf 1
log-adjacency-changes
network 192.168.20.0 0.0.0.255 area 0
network 10.0.0.0 0.255.255.255 area 0
network 11.0.0.0 0.255.255.255 area 0

PC1 192.168.10.11

PC2 192.168.10.21

PC3 192.168.10.31 

PC4 192.168.20.41

PC5 192.168.20.51

PC5 192.168.20.61

[Giuseppe Larosa]

Hello @kobe5934 ,

when using a L2 trunk that allows Vlans 10,20 like in your case the router interface has to configure using subinterfaces with appropriate matching 802.1Q encapulation.

example:

on routerA:

interface gi0/2

no ip address

interface gi0/2.10

encapsulation 802.1Q 10

ip address 192.168.10.1 255.255.255.0

exit

on routerB:

int gi0/2

no ip address

interface gi0/2.20

encapsulation 802.1Q 20

ip address 192.168.20.1 255.255.255.0

The subinterfaces numbers can be different but the commands for encapsulation must match the Vlans defined on the switch.

Edit:

after examing again your network diagram and configuration you need to configure one subinterface for vlan 10 on RouterA and the other subinterface of RB for vlan 20 gi0/2.20

in any case even with a single subinterface you need to use it because the switch ports are configured as trunks and will send out 802.1Q tagged frames that require subinterface(s) to be processed by the attached router(s).

Hope to help

Giuseppe

[kobe5934]

i am suppose to ping pc1-3 to router A
P4-6 to router B
switch1 to router A

switch0(1) to router B
I need help in this 

[kobe5934]

i am suppose get all ping 

[omz · Accepted solution]

Hi 

You have duplicate IP address on RouterA and RouterB .. you have assigned same address on both sides. 

Configure sub-interface on Routers for the vlans .. gig0/2.10 on RouterA and gig0/2.20 on RouterB as already suggested.

See attached.

[kobe5934]

what do u mean duplicate ip add ? i an unable to open the file @omz 

[omz]

IP add on RouterA int g0/0 and RouterB g0/0 are the same .. 10.0.0.11/8 .. should be different like g0/1 

using ver 7.3

[kobe5934]

ok ty

[kobe5934]

may i know what version are u using ?

[kobe5934]

do u mind helping me with telnet I am not sure about it

https://community.cisco.com/t5/routing/restrict-telnet-to-router-based-on-trusted-ip-addresses/m-p/4090688#M334738