Dynamic routing issue

[Bruno Silva]

Hello,

well, my question is: I have one central route (Cisco Catalyst 3750G-48TS-S) and twenty Switch with layer three ios (Cisco 3560G-24) conected in star topology....

What i want to know is, how central router can communicate with just another router (Cisco 1841) that is behind any 3560G layer three switch?

the cisco 1841 is always the same router that could be behind any other cisco 3560G switch.

Thanks a lot for your patience!

Bruno

[Bruno Silva]

Yeh....

with your script, i'll put it at each fixed station with respectives IPs and configurations...

With that scheme...HOW do you do the network design?

Put that scheme with the previous one and see the difficult of my issue.

[John Blakley]

I don't have anything quite like that, so I couldn't confidently suggest how to redesign it. I do see the difficulty that you're in though, and now after seeing it, I'd be curious to see if the script works for you.

HTH,
John

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[Bruno Silva]

The script will work... the only issue now, is that i only have ping from 3560 L3 switch if him have the network on eigrp.

form server or any host inside local network of 3560L3 switch, i can´t ping but from 3560 switch himself, it's possible.

[John Blakley]

I don't quite understand. Are you saying that you can ping the router from the 3560, but you can't ping the router from a host on the same switch? If that's the case, something is wrong. You should be able to connnect the router to the wimax device and be able to ping it without having eigrp configured since it's local to the switch. That goes back to the other problem where you couldn't ping the svi from the server for the "router" vlan.

HTH,
John

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[Bruno Silva]

example:

<1841 mobile unit (10.10.52.1:502)> ------ <3560 fixed(10.10.52.12:502)><3560fixed station(192.168.152.1)><192.168.152.30:HOST>

i can´t ping 10.10.52.1 that is mobile unit from the host.... but from 3560 itself it´s possible. from 192.168.152.1.

[John Blakley]

Bruno,

I'm not understanding the problem you're having at this time. The routing table on the 1841 won't have your fixed station routes unless eigrp is up and has a neighborship. If you're trying to ping a remote unit from a fixed host, you won't be able to because the 1841 doesn't know about the remote subnet.

You have to be able to ping the router from a local host. For example:

host ---> mobile 3560 ---> 1841 mobile

From the above host, you'll need to be able to ping the 1841. Is that possible?

HTH,
John

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[Bruno Silva]

Yeh, it's true.

that is always also possible because i have also a wimax equipment connected to 1841 router.

host-->mobile 3560--->1841 mobile-----> wimax mobile

[John Blakley]

So are you saying that you CAN ping the router from the host on the mobile network? That's where you need to run the script...

HTH,
John

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[Bruno Silva]

I have discover how to do it.

I just have to run a EEM on the 1841 mobile router that do a ping to discover wich fixed station responde to him!!!

YES!!!

[Bruno Silva]

Yes that's it!!

but 1841 support EEM!

I need something to ping every 20 fixed stations and one of them will answer!

[John Blakley]

Bruno,

What do you want to happen when the fixed station is responding?

HTH,
John

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[Bruno Silva]

I wanna add the statement of respective network on EIGRP on 3560.

mobile 1841 (10.10.51.1) ------ when succefull ping to ------ fixed 3560 (10.10.51.12)

Open a telnet session on fixed 3560 (10.10.51.12) and:

conf t

router eigrp 1

network 10.10.51.0 0.0.0.255

end

I have some problems with this solution... but, for now, is the only solution.

Bruno

[John Blakley]

As far as I know, you can't telnet with eem and send commands. You're wanting to add the network statement to the fixed 3560 for whenever a remote router comes up?

What is the wan side ip address of your mobile 1841s? If you can't ping that from your host on the fixed station side, put a static route on your 1841 pointing to your fixed station subnet. That way when you connect your 1841, your static route will let it know how to get back to your host on the fixed station side at all times. Then you can run the python script. You won't be able to do what you're wanting with an eem script though.

So to summarize, if your host is 192.168.1.50, put a static route on the 1841 for "ip route 192.168.1.0 255.255.255.0 ". Then when you ping from your host that the 3560 knows how to route for, the host should get responses regardless if eigrp is up or not.

HTH,
John

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[Bruno Silva]

Yes, once the vlan between mobile unit and fixet unit is up i would like to add eigrp network statement for mobile unit vlan ip on fixed station.

The wan ip address of my mobile unit is 192.168.144.0/24

When you say, "if your host is 192.168.1.50..." are you refer to hosts on fixed station?

I think that, further adding ip route pointing to hosts network of fixed station, on mobile station, is not possible to run script.

  

[John Blakley]

If the server that you're trying to ping from, or running the script from, is on the fixed station side of the network at 192.168.1.50/32, then on your 1841, put a static route of "ip route 192.168.1.50 255.255.255.255 " There has to be a common subnet between two devices somewhere. Is the 1841 wan interface also on 192.168.144.0/24? Let's assume that it is and your router is addressed at 192.168.144.1. In that case, your static route on the 1841 would be "192.168.1.50 255.255.255.255 192.168.144.2" where 192.168.144.2 is your wimax.

It's all static routing, but you have to be able to tell the 1841 how to get to your host without depending on eigrp to be up.

HTH,
John

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