Beginner Default Routing Question

[Tom101]

Hello all,

I am trying to wrap my head around default routing. Can anybody explain to me why these L3 switches cannot ping each other.

I have two L3 Switches acting as a routing device.

Switch 1 config: 

ip routing

ip route 0.0.0.0 0.0.0.0 20.20.20.20




interface FastEthernet0/1

no switchport

ip address 10.10.10.10 255.255.255.0

duplex auto

speed auto







Switch 2 config: 




ip routing

ip route 0.0.0.0 0.0.0.0 10.10.10.10




no switchport

ip address 20.20.20.20 255.255.255.0

duplex auto

speed auto

Attached is a screenshot of the topology and a packet tracer file. Thank you.

[Jon Marshall]

I can't open your file but the configurations you posted do not match the diagram. 

You need to use the same subnet on both switches eg. 10.10.10.10/24 on switch 1 and 10.10.10.11/24 on switch 2 and then they will be able to ping but you don't need a default route for that. 

Jon

[Tom101]

Sorry my bad. I have fixed the configuration. 

Both switches are on different networks. I have attached another copy of the packet tracer, hopefully that works. It's packet tracer version 8.1.1. 

[Jon Marshall]

I don't have PT so I'll leave to Georg. 

Jon

[Georg Pauwen]

Hello,

I still cannot open the file, it is still an invalid format. 

[Georg Pauwen]

Hello,

the .pkt file you sent is invalid.

Either way, you are using the same IP address, 10.10.10.10/24 on both interfaces. Change one of the IP addresses to 10.10.10.9/24. You do not need any static routing at all, as the interfaces are directly connected.

[Tom101]

I have fixed the question. Didn't realise it was wrong.

Please try another packet tracer file. Not sure why it wouldn't open. I'm using version 8.1.1.

[Tom101]

Strange, I'm not sure. Can open it fine on my computer. 

Is there away to configure it so they're on different networks and without vlans? Is that possible with default routing? 

[Georg Pauwen · Accepted solution]

Hello,

both interfaces need to have an IP address in the same subnet. Attached the revised file...

[Tom101]

I see. So it's not possible with static or default routing? 

[Georg Pauwen]

Hello,

static default routes are in there, but you don't need them, as both interfaces are on the same subnet, and directly connected...

[Tom101]

I just looked at your reverse packet tracer file, and it's all starting to make a lot more sense now  

Thank you, that was really helpful.