Cisco 1721 VLANs

Posted on 2005-04-04
Medium Priority
Last Modified: 2011-09-20

I have a WIC4ESW in the back of a 1721 router.

Thus far I have only needed 1 VLAN (this is the default).

I now need to configure port 2 of the WIC4ESW as a separate VLAN from port 1 of WIC and Ethernet port.

How do I do this?

Question by:yvsupport
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LVL 79

Accepted Solution

lrmoore earned 2000 total points
ID: 13698148
router#vlan database
Router(vlan)# vlan 2
apply completed
Router#config t
Router(config)#interface fastethernet 2
Router(config-if)#switchport access vlan 2
Router(config-if)#no shutdown

Now if you want VLAN 2 to be able to talk to anyone in VLAN 1, you need a layer 3 interface
Router(config)#interface vlan 2
Router(config-if)#ip address a.b.c.d
Router(config-if)#no shutdown

Host in VLAN2 has IP in subnet a.b.c.X
Host in VLAN2 has default gateway of a.b.c.d


Expert Comment

ID: 13698192
Interface e[Module]/[Port]
switchport access vlan [VLAN No.]

Where [Module] is the module number of the WIC, [Port] is the port on that module and [VLAN No.] is the VLAN ID you want to assign it to.

Hope that helps.


Author Comment

ID: 13698401
Wow - the Infamous Irmoore!

Thanks for your help - works a treat!

2 things - why the shudown before the switchport access line - is there a reason or is this just good practice?

Also, how do I now remove/delete the recenntly created VLAN?

thanks again.
LVL 79

Expert Comment

ID: 13698904
>why the shudown before the switchport access line - is there a reason or is this just good practice?
Suggested by Cisco documentation. Makes sense to "bounce" the interface after changing layer 2 access modes.

>how do I now remove/delete the recenntly created VLAN?
Same way you created it
Router#vlan database
router(vlan)#no vlan 2
router(vlan)#apply <-- I've found that "exit" does not always apply the changes when removing vlans

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