Problem with reaching another router (VLAN)

[jay.mar92]

Hi guys,

I'm studying CCNA ICND1 for a few weeks now. So far, I've created several basic networks with the Cisco Packet Tracer software.​

At this moment I'm stuck with the following problem, a computer can't ping an interface on the second router, see:

In more detail: PC0 want's to ping 10.0.1.2, but won't get any reply.

The PC-PT-PC0 is trying to ping Router2 at his interface [Serial2/0              10.0.1.2]

[The configuration of Switch1]

Vlan1                  10.0.2.254      YES manual up                    up

interface FastEthernet0/1

switchport mode trunk

switchport port-security

interface Vlan1

ip address 10.0.2.254 255.255.255.0

ip default-gateway 10.0.2.1

[The configuration of Router1]

interface FastEthernet0/0

ip address 10.0.2.1 255.255.255.0

duplex auto

speed auto

!

interface FastEthernet1/0

no ip address

duplex auto

speed auto

shutdown

!

interface Serial2/0

ip address 10.0.1.1 255.255.255.248

clock rate 2000000

ip route 10.0.1.0 255.255.255.248 10.0.1.2

[The configuration of PC0]

IP Address: 10.0.2.100

Subnet mask: 255.255.255.0

Default Gateway: 10.0.2.254

Could someone help me out? Thanks in advance!

[Richard Burts]

Why is the PC default gateway set to 10.0.2.254? Logically it should be set to the address of the router interface 10.0.2.1.

HTH

Rick

[jay.mar92]

Richard, thanks for the answer. I used the L3 GW's of the switches because I thought that was better.
So I configured the Default-GW of the switch as 10.0.2.1 ( so all the requests of the client will be forwarded to the router, which will forward the packets to the next hop/second router ).
But that won't work.

If I set the default GW to 10.0.2.1, the client CAN ping the second router. But that isn't the plan :)

[Richard Burts]

You have not supplied several details that are significant such as whether the switch is operating as a layer 2 switch or as a layer 3 switch. The behavior suggests that it is layer 2 but clarification of this point would be helpful.

You say that my suggestion isn't the plan. So can you clarify for us what the plan is?

HTH

Rick

[jay.mar92]

Oh, I'm sorry.

I wanted to use the switches as L3 switches. So the clients are able to communicate through the VLAN Gateways.​

BTW: Is it possible that the switches from Cisco Packet Tracer can't handle L3 traffic? I've tried the 2960 and the Generic one's. But the command "ip routing" doesn't even work.

[Richard Burts]

If the ip routing command does not work then the switch is a layer 2 only switch. And that explains why the PC can not ping remote addresses if the PC default gateway points to the switch IP address.

I am not expert in Packet Tracer. So someone else would need to address how to get layer 3 switching in a switch in Packet Tracer.

HTH

Rick

[jay.mar92]

I've googled in the meanwhile, and it's true that the devices don't support L3 switching... The 3560-24PS device does..

So I have to reconfigure the network, and use the new device. Then it should work.

Thanks for the help Richard.​​

[Richard Burts]

You are quite welcome.

Yes if you reconfigure to use switches that do support layer 3 processing then your plan should work.

HTH

Rick

[paul driver]

Hello

Is this topology simulating connecting two different sites?

if so try this:

 

Left side

Rtr 1

interface Serial2/0
description link to RTR2
ip address 10.0.1.1 255.255.255.248
 

Int fa0/0
no  ip address
 

int fa0/0.1
description link to switch
encapsulation dot1Q  1
ip address 1.1.1.1 255.255.255.0

int fa0/0.10
description link to switch
encapsulation dot1Q  10
ip address 10.0.2.1 255.255.255.0

ip route 10.0.3.0 255.255.255.0 10.0.1.2
ip route 11.11.11.0 255.255.255.0 10.0.1.2


Switch
conf t

int vlan 1
description MGT VLAN for switches
1.1.1.254 255.255.255.0
exit

ip default-gateway 1.1.1.1
 

Vlan 10
exit

int fa0/1
description link to Rtr1
switchport mode trunk

int fax/x
description link to PC
switchport host
switchport access vlan 10
 

PC
ip address 10.0.2.100 255.255.255.0
subnet mask 255.255.255.0
Default-gateway 10.0.2.1

Right side

Rtr 2

interface Serial2/0
description link to RTR1
ip address 10.0.1.2 255.255.255.248

Int fa0/0
no  ip address

int fa0/0.1
description link to switch
encapsulation dot1Q  1
ip address 11.11.11.1 255.255.255.0

int fa0/0.20
description link to switch
encapsulation dot1Q  20
ip address 10.0.3.1 255.255.255.0

ip route 10.0.2.0 255.255.255.0 10.0.1.1
ip route 1.1.1.0 255.255.255.0 10.0.1.1

Switch
conf t

int vlan 1
description MGT VLAN for switches
11.11.11.254 255.255.255.0
exit
ip default-gateway 11.11.11.1

Vlan 20
exit

int fa0/1
description link to Rtr1
switchport mode trunk

int fax/x
description link to PC
switchport host
switchport access vlan 20

PC
ip address 10.0.3.100 255.255.255.0
subnet mask 255.255.255.0
Default-gateway 10.0.3.1


res

Paul