Default static routes

[w0463849]

Hello, I'm trying to add a default static route from a 2811 router called main branch to a 3560 layer 3 switch. The 2811 router is connected via a console cable. I have no idea how to do IP routing. Please help.

[w0463849]

OSPF is configured between the three routers BUT not the layer 3 switch

[M02@rt37]

Hello @w0463849 

please clarify your concern.

You need to configure OSPF on the 3 2811 routers ?

Why static route (default route) is needed in your case ?

[w0463849]

Yes, I already configured OSPF on the three routers. I need a default static route because I need to ping the server from the computers.

[M02@rt37]

Ok @w0463849 

So don't use default route.

Configure a static route on 2811 router pointing the IP add of the server. Next hop as the L3 Switch. The Gateway of the server is configured on the L3 Switch ?

Redistribute the static route form your ospf instance on that 2811 router:

router ospf x

redistribute static

[Flavio Miranda · Accepted solution]

@w0463849 

 On the router, you run this command

conf t

ip route 172.16.144.0 0.0.0.255 10.10.1.2

On the layer3 switch you do this

conf t

ip route 0.0.0.0 0.0.0.0 10.10.1.1

That´s it.

[w0463849]

Hi again :), so when I run those commands I'm able to ping 10.10.1.2 but for the server I get destination unreachable. Is 0.0.0.255 a wildcard mask? Am I supposed to use a wildcard mask instead of a subnet mask?

[balaji.bandi]

First on both device Router and Switch  - ip routing (command to enable ip routing)

From Router you want to route the Traffic to Switch

you need to add routing as below :

you can add default route :

ip route 0.0.0.0 0.0.0.0 10.10.1.2 or specific route as below

ip route 172.16.114.0 255.255.255.248 10.10.1.2

On the Switch also you need to add Route back towards Router :

ip route 0.0.0.0 0.0.0.0 10.10.1.1

This is high level - if you need more help post below output from all devices.

show run

show ip route

show ip interface brief

Note : make sure PC have no firewall enable which blocking the pings.

[w0463849]

I attached the file if you want to check it out. Firewalls are disabled and I tried all the commands you guys suggested to no avail. I'm going to take a break and come back to this later.

[Joseph W. Doherty]

If you're pinging the LAN side of the 3650, it too will need how to route to other IPs.

On your 3650 you could use a default route to the main branch router and on that router a static route to the /29.

You could also consider using OSPF on the 3650.

If you need help with the two static route, let me know.

[w0463849]

Here is the file if you want to check it out.

[M02@rt37]

@w0463849 

So don't use default route.

Configure a static route on 2811 router pointing the IP add of the server. Next hop as the L3 Switch. The Gateway of the server is configured on the L3 Switch ?

Redistribute the static route from your ospf instance on that 2811 router:

router ospf x

redistribute static

[Joseph W. Doherty]

"Configure a static route on 2811 router pointing the IP add of the server."

You could do just that, but possibly a more common, or better, practice would be to route to the subnet, i.e. the /29, not just the one host.  Even in this case, if you route only to the server host, it would preclude pinging the /29's router IP.

[Joseph W. Doherty]

I've been responding from my phone, so unable, at the moment, to open your lab.

With @Flavio Miranda reply, I may not need to unless you want to see using OSPF on the L3 switch (my preferred approach) and/or seeing how to generate a default route in OSPF without need to redistribute statics.

[w0463849]

 Here is the file guys. Feel free to check it out. I'm working on an assignment for school and IP routing is just confusing me...