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connecting two networks.

Posted on 2011-03-11
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Last Modified: 2012-06-27
Hi,

Network A
ds3 router - ASA 5510 -- Catalyst 4507  (172.17.20.x /24 range)

Network B

(10.59.1.x/range)
MPLS router - Cisco Catalyst 3550

From the diagram above, i have two networks in the office.  ATM they dont talk.  I was wandering if its possible to run a cable from the 4507 switch on network A to the router on network B and get them to start talking to each other.

If thats possible can somebody recomend me as to what i need to do?
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Question by:vburshteyn
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by:--TripWire--
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Do your routers have trunk ports?  You can run a trunk line between the two of them.
Remember to set your interface values in IOS.
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by:vburshteyn
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so
lets say port fa3/10 on the catalyst 4507 and port fa0/1 on the router --- trunk them together?

do i need to set up any vlans?
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by:--TripWire--
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The trunk port won't be a FastEthernet port.  You should be able to tell just by looking at your routers, it won't be together with the others.  If it's not evident to you immediately just by looking at it - you don't have one.
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by:vburshteyn
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nope no trunk ports
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by:--TripWire--
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Well, maybe somebody else knows a better way - but as far as I know, the only way to connect two networks with Cisco is to use a trunk line.
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by:--TripWire--
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Is it possible to just use one router and create the two vlans?
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by:MAG03
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you have a few options here, you could connect a cross-over cable or serial cable between the routers and configure the serial interfaces and set up the routing protocols as needed.

Or, you could connect a cross-over cable directly between the switches, trunk the ports on both switches, and configure routing  on the switches. (I believe the 4507 is a layer 3 switch if i am not mistaken and so is the 3550).
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by:vburshteyn
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Mag03.

Would you be able to point me in the right direction on how to set up the routing between the two switches?

I am new to cisco and trying to learn asap but still not there yet, as you can see.
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MAG03 earned 500 total points
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choose, a port on both switches to connect the cross-over cable to. then issue the following commands on both switches.

enable
configure terminal
interface fa0/10 (or whatever the interface number may be)
switchport trunk encapsulation dot1q
switchport mode trunk

Now you need to decide on a routing protocol...I would recommend either rip or eigrp ( I would lean more towards eigrp though)

on both switches:

enable
configure terminal
router eigrp 10
no auto-summary
network 172.17.20.0 0.0.0.255
network 10.59.1.0 0.0.0.255

you can continue to enter the networks needed using the network command followed by the network address and wildcard mask.

The neighbors should come up almost immideatly and you should see a message on the terminal screen saying NBR eigrp 10 loaded...or something along those lines.

you can also check by issuing the "show ip eigrp neighbor" command from enable mode.
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by:vburshteyn
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Mag,

Thanks,
 stupid question, this will route date between both networks, it will not affect the way the rest of the data flows right?

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Expert Comment

by:MAG03
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Good point, I forgot to mention that.  It will route traffic for the networks configured in EIGRP. However, you will need to issue a default route pointing to your router on both switches for internet access.

ip route 0.0.0.0 0.0.0.0 x.x.x.x  (where x.x.x.x is the ip address of the interface on the router connected to each switch)
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by:vburshteyn
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shooot --- my 3550 only has Standard Multilayer Image :(
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by:vburshteyn
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Mag03 -- so i have a SMI switch.

Can i connect the 4507 to the router?
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by:MAG03
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yes, you can connect both switches to the router. The switches will perform the inter vlan / network routing and the router will handle the internet traffic. You could remove the router but then there would be more configuration involved and i do not see a point in doing that at the moment.  

How many vlans do you have on each switch, or is it just the two networks you mentioned above?
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by:vburshteyn
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two networks

i just need both to see each other, but the routers need to stay in placy...
4507 -> two vlans (1 data 2. voip)

the other network is just being setup so i can do what ever i want wit hit.

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by:MAG03
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alright let me know how it goes...just keep in mind to back up your configurations before you make changes. You should already have it backed up but ;-)
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by:vburshteyn
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got the backups

Just curious,

create a new vlan (on 4507 and spare port on the router) connected via regular cable???

and use eigrp to route it?

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by:MAG03
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connection to the router is for the internet so internet does not take up bandwidth over the inter-switch link.

If you want to use a different vlan than the default vlan (vlan 1) then yes create a vlan on the switch. if you do this then you need to trunk the port going to the router aswell.

What brand and model is the router?

you can connect the switch to the router with a straight through cable...ie regular cable.

the connection between the switches will need to be a cross-over cable.  Some newer switches are able to detect if a straight through cable is connected and adjust accordingly but use a cross-over to be sure.

configure routing on the switches for two networks ( you will need at least one vlan within the same subnet on each switch.)

configure default route on each switch pointing to the router for internet traffic.
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by:vburshteyn
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Mag03, sorry for all these questions, and i truly appreciate the help.

Router :

fa0/0   -----> to that lan
10.59.1.1 /24

fa0/1 --> to 4507
10.60.1.1

4507
create vlan 10
assign ip 10.60.1.1
assign port to vlan 10

if correct so far, then i need to enable eigrp like u said earlier?


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Expert Comment

by:MAG03
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depends, are you going to use the router to route the vlan traffic or are you going with my suggestion with the inter-switch link.  If you are using the switch to switch cabling then you will need to use rip as the SMI doesn't support EIGRP. Its not a bad protocol and is not as system intensive as OSPF and BGP.

If you are going to use the router to route the traffic then you could use EIGRP.
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