OSPF configuration

[rouzbehta]

Hello all,

I am so confused on a network configuration, I attached a pdf file which shows a network I am going to build.

If some one can help me and give me the configuration I really appreciate it.

Best Regards,

[Mahesh Gohil]

Hello,

Please find config as per the instruction given in diagram

==========================================

RTR2

int fa0/0
no ip address
no shut

int fa0/0.10
encapsulation dot1q 10
ip address 10.10.10.1 255.255.255.128
no shut

router ospf 1

router-id 2.2.2.2
network 10.10.10.0 0.0.0.127 area 0
network 2.2.2.2 0.0.0.0 area 0
network 172.31.0.0 0.0.255.255 area 0

RTR1

int fa0/0
no ip address
no shut

int fa0/0.11
encapsulation dot1q 11
ip address 10.10.10.129 255.255.255.128
no shut

router ospf 1

router-id 1.1.1.1
network 10.10.10.128 0.0.0.127 area 0
network 1.1.1.1 0.0.0.0 area 0
network 192.168.0.0 0.0.255.255 area 0

Switch:

int fa0/1.10
encapsulation dot1q 10
ip address 10.10.10.2 255.255.255.128

int fa0/2.11
encapsulation dot1q 11
ip address 10.10.10.130 255.255.255.128

router ospf 1
network 10.10.10.0 0.0.0.127 area 0
network 10.10.10.128 0.0.0.127 area 0

============================

Please let me know if you face any problem with above config

Regards

Mahesh

[rouzbehta]

Dear Mahesh,

In the switch I can't define encapsulation dot1q 10 on the suninterface fa0/1.10, switch doesn't have this ability, is it because IOS issue or the switch problem?

Regards

[martin_knorre]

Hi,

you can only create subinterfaces on Router interfaces not on switchinterfaces.

Rgds Martin

[Mahesh Gohil · Accepted solution]

Hi,

Sorry for this but no problema there is a way.

First you need to check whether your switch support ospf or not  if yes you can try below config to give IP address

on vlan interface

----------:Router:--------------

Router#
interface FastEthernet6/0.101
encapsulation dot1Q 101
ip address 189.189.189.1 255.255.255.252
no snmp trap link-status
end

---------: Switch :-------------

vlan 101

name TEST1

interface Vlan101
ip address 189.189.189.2 255.255.255.252
no shut

end

interface GigabitEthernet1/0/1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 101
switchport mode trunk
end

same way you can configure other end of switch.

Regards

Mahesh

[rouzbehta]

Thank you dear Mahesh, it was correct and works fine

Regards

[Jigar Dave]

Hello rouzbehta,

please clarify the switch you are using is Layer 2 or layer 3?
in layer 3 switch we can assign IP address but in layer 2 switch we can't.
That will help

Best regards,
Jigar Dave

[cadet alain]

Hi,

as it is asked for an ospf peering with the switch it must be a L3 switch.

I decided to use routed ports but you could have used SVIs instead for VLAN10 and VLAN11.

On each router f1 interface must be connected to a switch trunk link.

I attached the config that I think should do what you want.

Regards.

Alain.

[glen.grant]

  On a normal switch you cannot use subinterfaces to trunk .  You need to setup layer 3 svi's  and then setup trunking on the link .