Cisco 1400 Wireless Bridges - 3640's, yea or nay, or can the 6509 do it all????

Posted on 2004-03-26
Medium Priority
Last Modified: 2010-04-17
Here's one for ya...

I'm putting up Cisco 1400 Bridges. I've got T-1's and 3640's right now, but the 3640's at most sites will be disappearing since I will have the 1400 Wireless in place. Or should they disappear?

Right under the 3640 router is a 6509 switch. Sup2, NAM, fiber, several PoE ethernet blades. Each network is a mirror image, 3640 T-1, and a 6509.

We are on a 10's network at all the sites, so let's say we have site 10.X.1.X, 2.X, 3.X etc. The T-1's at site 1.X will stay, 2,3,4, and 5 will all have 1400's pointing back to 1.X - I want to keep the networks separated, each site with it's own DHCP server etc.

Now, what's the best way to set this up, how would you go about it? Can the 6509 do it all? Should I keep the router in place? Is the new default gateway at 1.X, or do I use the bridge, 6509, same router as the default gateway at each site?

Have I sufficiently confused you?

Question by:RushB
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LVL 79

Expert Comment

ID: 10695089
You're changing from a routed topology to a bridged topology.
since you want to keep all sites on separate subnets, you'll need some layer 3 routing device somewhere. Unless you have the MSFC2 blades in the 6509, you might want to keep the 3640's, but you might need another Ethernet interface on them.
Since the 3640 is nearing end-of-life, I would consider using a 3750 as a L3 "router" in its place. You could consolodate all L3 functions at the core site, but then all your broadcasts (i.e. dhcp requests) will go over the air and eat up bandwidth.
So, replace the 3640 with a L3 switch and you're on your way.
You might also want to keep the T1 for a while to make sure the wireless solution is stable enough for you.

Author Comment

ID: 10695153
The plan is definitely to keep the T-1 for the time being, until we see how stable the wireless is going to be. The blade in the 6509 is a Sup 2, so it should be able to take over the routing. The problem is, how do I do this? I have never done this with the Cat OS, and it is totally different in the setup. How do I make the gateway the 6509, or the bridge, or whatever... Everything else should still work as it does if the 6509 becomes the bridge, correct?

LVL 79

Accepted Solution

lrmoore earned 1500 total points
ID: 10695207
Supervisor 2 and MSFC2 are not the same.
If you have the MSFC2, you can session to it from the CAT prompt, then you have a router IOS prompt.

cat6509(enable)session 15


The way it works is that you setup VLAN interfaces with IP addresses.

interface vlan 1
 ip address
interface vlan 2
 ip address

Then, you put the switchport interfaces into a vlan
6509(enable)set port 5/4 vlan 2

(i'm rusty on the catOS syntax, so that may not be 100% accurate, but you get the picture)

Now, anything on VLAN 2 needs to have IP address in subnet 10.10.3.x, and point to 3.2 as the default gateway. The MSFC acts just like a router with multiple interfaces.

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