Hi Andrew,
Going to do a few things here:
1- Create the vlan, dhcp pool, static routes (if you desire), and access control lists (if you want to prevent certain traffic between existing network and new guest access) on the 1801 router.
interface fastethernet 0/0 no ip address
interface fastethernet 0/0.1 encapsulation dot1q 1 native (native vlan 1)
ip address 192.168.1.1 255.255.255.0
interface fastethernet 0/0.2 encapsulation dot1q 2 (guest vlan 2)
ip address 192.168.2.1 255.255.255.0
ip dhcp pool Pool1
network 192.168.1.0 255.255.255.0
domain-name DOMAIN.COM
dns-server 4.2.2.2
default-router 192.168.1.1
ip dhcp pool Pool2
network 192.168.2.0 255.255.255.0
domain-name DOMAIN.COM
dns-server 4.2.2.2
default-router 192.168.2.1
Remember, you'll need the nat, speed & duplex commands, as you likely already have configured in your 1801, static routes if you want intervlan routing, and access control lists if you so desire.
2 - I'm assuming there is a switch between the 1801 and the AP. You'll need to trunk the vlans from 1801 to switch and trunk vlans from switch to AP541n
3 - create a new guest access ssid, matching the new vlan you created on the 1801 on the AP541n. Set up wireless security as you desire.
Best,
David
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