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Migration from Cat 4006 to Cat 4500

Posted on 2007-10-09
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Last Modified: 2008-01-09
Hi guys
I have cat 4006 switch in working as core switch with WS4232 routing module. it has a HW failuer and cousing a lot of proplems so I am going to replace it with Cat 4506 Core.
currently my config as the following
- 4 Network segments (4 Vlans), each one is trunked to Gb interface on the routing blade for intervlan routing.
- static route is there as last resort route
- some ACLs are applied between interfaces.

I want to know what is the best configuration to apply it in the new L3 core 4500. and how to create Vlans and handle the intervlan routing since there is no trunking and router  interfaces cuz this is my first time to work on L3 switch.

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Question by:Ahmed Abdel Salam
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7 Comments
 
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Expert Comment

by:Don Johnston
ID: 20043915
So you're going from a hybrid mode switch to a native mode switch?

Your best bet is to use the Config Conversion Tool.

http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a0080816fbc.shtml


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Author Comment

by:Ahmed Abdel Salam
ID: 20044323
I am not sure if i can call it hypred mode or not because the Supervisor is using Cat OS and there is a routing blade  using IOS. so you can call the entire system as hybrid mode. but sure the new system will be IOS only.
the convertion tools is good but I need to be sure about best practice to be implemented in the new system.
I would like to know how is the trunking, intervlan routing and vlans is working in L3 switches!!
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Expert Comment

by:Don Johnston
ID: 20044522
>I am not sure if i can call it hypred mode or not because the Supervisor is using Cat OS and there is a routing blade  using IOS.

That is Hybrid mode.

>but sure the new system will be IOS only.

If it's a new switch, most likely you'll be running it in native mode.

>but I need to be sure about best practice to be implemented in the new system.

That's a bit of an ambiguous question. Best practices about what? Trunking? Spanning-Tree? Security?

>I would like to know how is the trunking, intervlan routing and vlans is working in L3 switches!!

Well, the 4500 isn't a layer 3 switch. It's a multilayer switch. And when it comes to trunking, it works the exact same way as it does in a layer 2 switch. InterVLAN routing works very close in a native mode switch as it does in a hybrid mode switch. The big difference is that instead of having to configure the route processor separately, it's configured from the same CLI as the rest of the switch.
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Author Comment

by:Ahmed Abdel Salam
ID: 20044685
Thanks donjohnston and sorry for my question..
I understand what did u discribed
>>The big difference is that instead of having to configure the route processor separately, it's configured from the same CLI as the rest of the switch
my confusion is, in the current scenario my config is like this ..
eg. Vlan 2
set vlan 2 2/1-10
set trunk 2/1 nonegotiate dot1q 2

then in routing blade

interface GigabitEthernet1.2
 encapsulation dot1Q 2
 ip address 1.1.1.1 255.255.0.0

in this example you can see ports 2/1-10 has been added to Vlan 2, then port 2/1 used for trunking. then in rouing blade this vlan is linked to G1 for intervlan routing.

so I would like to understand how is the new config in 4500 will be since there is no interfaces like g1 ? and how I can add ports to Vlan ? and is it required to configure trunking as in this example ?
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Accepted Solution

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Don Johnston earned 2000 total points
ID: 20045116
The following will make g2/1 an 802.1q trunk, create a vlan 2 interface on the route processor and make fastethernet 3/1 a member of VLAN2.

conf t
vlan 2
interface g2/1
 switchport
 switchport trunk encap dot1q
 switchport mode trunk
 no shutdown
interface vlan 2
 ip address 1.1.1.1 255.255.0.0
 no shutdown
interface fa3/1
 switchport
 switchport access vlan 2
 no shutdown
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Author Comment

by:Ahmed Abdel Salam
ID: 20046293
Thanks donjohnston, one more duet. what is the interface g2/1 is it a normal port on the switch ??
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Expert Comment

by:Don Johnston
ID: 20047400
Yes
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