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Configuring Gigabit ports on Cisco 4506

Posted on 2006-10-31
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Last Modified: 2008-01-09
Hi all,

I currently have a Catalyst 4506 and I have two open fiber gigabit ports, which I'd like to use.  All of my other ports and all my Vlans are already configured.  This was done by an outside complany, so now I'm trying to expand upon what they did, but I'm having some difficulty.  Here is a section of the current config:

interface GigabitEthernet2/6
 description "Trunked Link to Lib"
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1,40,60,70
 switchport mode trunk
!
interface GigabitEthernet3/1
 switchport trunk allowed vlan 1,20,60,70
 shutdown
!
interface GigabitEthernet3/2
 description Not on Visio
 shutdown

Interfaces 3/1 and 3/2 should look like interface 2/6 with the exception of a different vlan (172) and a different description.  I've tried going into configuration mode and making changes to the interface, but they never seem to actually change anything, as this is the same config as it's been.  I'm relatively new to this, and need some help.  If anyone can tell me what commands to use to change this config, I'd greatly appreciate it.  Again, it should mirror interface 2/6 just with a different decscription, and with vlan 172 only.  

Thanks.
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Question by:iamcheese
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mikebernhardt earned 500 total points
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interface GigabitEthernet3/1
description blah
switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 172
 no shutdown
!
interface GigabitEthernet3/2
description more blah
switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 172
 no shutdown

there is both a running config (in memory) and a startup config (in NVRAM). when you say nothing's changed, are you typing "show config" or "show runn"
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by:mikebernhardt
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Oh- if vlan 172 isn't already configured, you need to do it this way:
config t
vlan 172
interface GigabitEthernet3/1
description blah
switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 172
 no shutdown
!
interface GigabitEthernet3/2
description more blah
switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 172
 no shutdown
end
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by:iamcheese
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I've been using show config.  I didn't check show runn yet, but will do so first thing tomorrow morning.  How do you save the current running config to the startup config, or is that unnecessary?
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by:iamcheese
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Thanks a lot mike, that worked perfectly, and it was because i was looking at the startup config instead of the running config.
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by:mikebernhardt
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You do need to save the changes or they will be lost if the switch reboots. you can type either "write mem" or "copy runn start" while in enable mode. If you use the latter, it will ask you a few questions. Just hit enter to all of them.
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