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jcc05

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How do I Configuring multiple VLANS on a Catalyst 5000 to use seperate uplinks to a 2600 router

I have a Catalyst 5000 with 1 supervisor module, and 4 12 port ethernet modules.

I have created 4 separate vlans using ports 1/1-12, 2/1-12, 3/1-12, and 4/1-12

How would I go about setting port 1/1, 2/1,3/1, and 4/1 as seperate uplinks for all hosts within those vlans. My goal is to have the Catalyst 5000 act as 4 seperate switches which all link to my 2600 router for access-lists and routing between the 4 VLANS.

Also, would it be possible to have all the VLANS use a single port for the uplink to the router and how would that be configured.

For my router, I have 4 ethernet interfaces that connect to ports 1/1, 2/1, 3/1, and 4/1 with the following ip's:

10.1.1.1
10.1.2.1
10.1.3.1
10.1.4.1

Each host within the corresponding VLAN has an ip in the same network. I.e if the host was in VLAN 1 it would have an ip in the 10.1.1.0/24 range.



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pseudocyber

Yes, you could use a single uplink - turning your router into a "one armed router" so that all four vlans would pass through 1 link.  I think it would depend on your code - but you would use 802.3q VLAN trunking and make both ports tagged so that that traffic from VLAN1 would be tagged and so on.  On the router, you'd have that port tagged as well and the interface would have 4 subinterfaces on it with different IP's.
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mikebernhardt
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Some newer Cisco 5000 10/100 blades support 802.1q trunking as an alternative to ISL.  Some recent Cisco routers support only 802.1q and not ISL.  (We learned this the hard way; you could get lucky.)

Note that you could probably buy four 2912XLs for less than the 5000 cost.  Using VLANs *just* to make a big switch act as several small switches is not a cost-effective approach.  It's when you add trunking that you start to see some payoff from VLANs.

As I said, the ROUTER may not support 802.1q. But if it's a 2600, it definitely supports ISL on a 100mb interface. And the switch you have definitely will too. It was Cisco's pre-802.1q trunking protocol, and all the 5000s will do it.